From a663f5b481679d8a352c668825cee92f548f3fcc Mon Sep 17 00:00:00 2001
From: trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Sun, 10 Jun 2007 18:16:11 +0000
Subject: Merging OFDM features branch r5661:5759 into trunk. OFDM works over
 the air with BPSK and QPSK modulations on subcarriers. Passes make distcheck.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5761 221aa14e-8319-0410-a670-987f0aec2ac5
---
 .../src/python/gnuradio/blksimpl/Makefile.am       |   7 +-
 gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py | 284 +++++++++++++++++++++
 .../src/python/gnuradio/blksimpl/ofdm_pkt.py       | 229 -----------------
 .../src/python/gnuradio/blksimpl/ofdm_receiver.py  |  19 +-
 .../src/python/gnuradio/blksimpl/ofdm_sync.py      | 141 ----------
 .../python/gnuradio/blksimpl/ofdm_sync_fixed.py    |  41 +++
 .../src/python/gnuradio/blksimpl/ofdm_sync_ml.py   | 135 ++++++++++
 .../src/python/gnuradio/blksimpl/ofdm_sync_pn.py   | 135 ++++++++++
 .../src/python/gnuradio/blksimpl/ofdm_sync_pnac.py | 126 +++++++++
 gnuradio-core/src/python/gnuradio/gr/Makefile.am   |   1 +
 .../python/gnuradio/gr/qa_ofdm_insert_preamble.py  | 179 +++++++++++++
 .../src/python/gnuradio/ofdm_packet_utils.py       |  19 +-
 gnuradio-core/src/python/gnuradio/packet_utils.py  |   4 +-
 13 files changed, 937 insertions(+), 383 deletions(-)
 create mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py
 delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py
 delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py
 create mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py
 create mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
 create mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
 create mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py
 create mode 100755 gnuradio-core/src/python/gnuradio/gr/qa_ofdm_insert_preamble.py

(limited to 'gnuradio-core/src/python')

diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am b/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
index b8c8001101..71598354c1 100644
--- a/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
@@ -40,9 +40,12 @@ grblkspython_PYTHON =		\
 	cpm.py			\
 	nbfm_rx.py		\
 	nbfm_tx.py		\
-	ofdm_pkt.py		\
+	ofdm.py			\
 	ofdm_receiver.py	\
-	ofdm_sync.py		\
+	ofdm_sync_fixed.py	\
+	ofdm_sync_ml.py		\
+	ofdm_sync_pnac.py	\
+	ofdm_sync_pn.py		\
 	pkt.py			\
 	psk.py			\
 	qam.py			\
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py
new file mode 100644
index 0000000000..74a674cb5e
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py
@@ -0,0 +1,284 @@
+
+#
+# Copyright 2006,2007 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+import math
+from numpy import fft
+from gnuradio import gr, ofdm_packet_utils
+import gnuradio.gr.gr_threading as _threading
+
+from gnuradio.blksimpl.ofdm_receiver import ofdm_receiver
+
+
+# /////////////////////////////////////////////////////////////////////////////
+#                   mod/demod with packets as i/o
+# /////////////////////////////////////////////////////////////////////////////
+
+class ofdm_mod(gr.hier_block):
+    """
+    Modulates an OFDM stream. Based on the options fft_length, occupied_tones, and
+    cp_length, this block creates OFDM symbols using a specified modulation option.
+    
+    Send packets by calling send_pkt
+    """
+    def __init__(self, fg, options, msgq_limit=2, pad_for_usrp=True):
+        """
+	Hierarchical block for sending packets
+
+        Packets to be sent are enqueued by calling send_pkt.
+        The output is the complex modulated signal at baseband.
+
+	@param fg: flow graph
+	@type fg: flow graph
+        @param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
+        @param msgq_limit: maximum number of messages in message queue
+        @type msgq_limit: int
+        @param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
+        """
+
+        self._pad_for_usrp = pad_for_usrp
+        self._modulation = options.modulation
+        self._fft_length = options.fft_length
+        self._occupied_tones = options.occupied_tones
+        self._cp_length = options.cp_length
+
+        win = [] #[1 for i in range(self._fft_length)]
+
+        # Use freq domain to get doubled-up known symbol for correlation in time domain
+        zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
+        ksfreq = known_symbols_4512_3[0:self._occupied_tones]
+        for i in range(len(ksfreq)):
+            if((zeros_on_left + i) & 1):
+                ksfreq[i] = 0
+
+        # hard-coded known symbols
+        preambles = (ksfreq,
+                     known_symbols_4512_1[0:self._occupied_tones],
+                     known_symbols_4512_2[0:self._occupied_tones])
+        
+        padded_preambles = list()
+        for pre in preambles:
+            padded = self._fft_length*[0,]
+            padded[zeros_on_left : zeros_on_left + self._occupied_tones] = pre
+            padded_preambles.append(padded)
+            
+        symbol_length = options.fft_length + options.cp_length
+
+        # The next step will all us to pass a constellation into a generic mapper function instead
+        # of using these hard-coded versions
+        if self._modulation == "bpsk":
+            self._pkt_input = gr.ofdm_bpsk_mapper(msgq_limit, options.occupied_tones, options.fft_length)
+        elif self._modulation == "qpsk":
+            self._pkt_input = gr.ofdm_qpsk_mapper(msgq_limit, options.occupied_tones, options.fft_length)
+        else:
+            print "Modulation type not supported (must be \"bpsk\" or \"qpsk\""
+        
+        self.preambles = gr.ofdm_insert_preamble(self._fft_length, padded_preambles)
+        self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
+        self.cp_adder = gr.ofdm_cyclic_prefixer(self._fft_length, symbol_length)
+        self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
+        
+        fg.connect((self._pkt_input, 0), (self.preambles, 0))
+        fg.connect((self._pkt_input, 1), (self.preambles, 1))
+        fg.connect(self.preambles, self.ifft, self.cp_adder, self.scale)
+        
+        if options.verbose:
+            self._print_verbage()
+
+        if options.log:
+            fg.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length, "ofdm_mapper_c.dat"))
+
+        gr.hier_block.__init__(self, fg, None, self.scale)
+
+    def send_pkt(self, payload='', eof=False):
+        """
+        Send the payload.
+
+        @param payload: data to send
+        @type payload: string
+        """
+        if eof:
+            msg = gr.message(1) # tell self._pkt_input we're not sending any more packets
+        else:
+            # print "original_payload =", string_to_hex_list(payload)
+            pkt = ofdm_packet_utils.make_packet(payload, 1, 1, self._pad_for_usrp)
+
+            #print "pkt =", string_to_hex_list(pkt)
+            msg = gr.message_from_string(pkt)
+        self._pkt_input.msgq().insert_tail(msg)
+
+    def add_options(normal, expert):
+        """
+        Adds OFDM-specific options to the Options Parser
+        """
+        normal.add_option("-m", "--modulation", type="string", default="bpsk",
+                          help="set modulation type (bpsk or qpsk) [default=%default]")
+        expert.add_option("", "--fft-length", type="intx", default=512,
+                          help="set the number of FFT bins [default=%default]")
+        expert.add_option("", "--occupied-tones", type="intx", default=200,
+                          help="set the number of occupied FFT bins [default=%default]")
+        expert.add_option("", "--cp-length", type="intx", default=128,
+                          help="set the number of bits in the cyclic prefix [default=%default]")
+    # Make a static method to call before instantiation
+    add_options = staticmethod(add_options)
+
+    def _print_verbage(self):
+        """
+        Prints information about the OFDM modulator
+        """
+        print "\nOFDM Modulator:"
+        print "Modulation Type: %s"    % (self._modulation)
+        print "FFT length:      %3d"   % (self._fft_length)
+        print "Occupied Tones:  %3d"   % (self._occupied_tones)
+        print "CP length:       %3d"   % (self._cp_length)
+
+
+class ofdm_demod(gr.hier_block):
+    """
+    Demodulates a received OFDM stream. Based on the options fft_length, occupied_tones, and
+    cp_length, this block performs synchronization, FFT, and demodulation of incoming OFDM
+    symbols and passes packets up the a higher layer.
+
+    The input is complex baseband.  When packets are demodulated, they are passed to the
+    app via the callback.
+    """
+
+    def __init__(self, fg, options, callback=None):
+        """
+	Hierarchical block for demodulating and deframing packets.
+
+	The input is the complex modulated signal at baseband.
+        Demodulated packets are sent to the handler.
+
+	@param fg: flow graph
+	@type fg: flow graph
+        @param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
+        @param callback:  function of two args: ok, payload
+        @type callback: ok: bool; payload: string
+	"""
+        self._rcvd_pktq = gr.msg_queue()          # holds packets from the PHY
+
+        self._modulation = options.modulation
+        self._fft_length = options.fft_length
+        self._occupied_tones = options.occupied_tones
+        self._cp_length = options.cp_length
+        self._snr = options.snr
+
+
+        # Use freq domain to get doubled-up known symbol for correlation in time domain
+        ksfreq = known_symbols_4512_3[0:self._occupied_tones]
+        for i in range(len(ksfreq)):
+            if(i&1):
+                ksfreq[i] = 0        
+
+        zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
+        zeros_on_right = self._fft_length - self._occupied_tones - zeros_on_left
+        ks0 = zeros_on_left*[0.0,]
+        ks0.extend(ksfreq)
+        ks0.extend(zeros_on_right*[0.0,])
+        
+        ks0time = fft.ifft(ks0)
+        # ADD SCALING FACTOR
+        ks0time = ks0time.tolist()
+
+        # hard-coded known symbols
+        preambles = (ks0time,
+                     known_symbols_4512_1[0:self._occupied_tones],
+                     known_symbols_4512_2[0:self._occupied_tones])
+        
+        symbol_length = self._fft_length + self._cp_length
+        self.ofdm_recv = ofdm_receiver(fg, self._fft_length, self._cp_length,
+                                       self._occupied_tones, self._snr, preambles,
+                                       options.log)
+        self.ofdm_demod = gr.ofdm_frame_sink(self._rcvd_pktq,
+                                             self._occupied_tones,
+                                             self._modulation)
+        
+        fg.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
+        fg.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
+
+        if options.verbose:
+            self._print_verbage()
+            
+        gr.hier_block.__init__(self, fg, self.ofdm_recv, None)
+        self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
+
+
+    def add_options(normal, expert):
+        """
+        Adds OFDM-specific options to the Options Parser
+        """
+        normal.add_option("-m", "--modulation", type="string", default="bpsk",
+                          help="set modulation type (bpsk or qpsk) [default=%default]")
+        expert.add_option("", "--fft-length", type="intx", default=512,
+                          help="set the number of FFT bins [default=%default]")
+        expert.add_option("", "--occupied-tones", type="intx", default=200,
+                          help="set the number of occupied FFT bins [default=%default]")
+        expert.add_option("", "--cp-length", type="intx", default=128,
+                          help="set the number of bits in the cyclic prefix [default=%default]")
+    # Make a static method to call before instantiation
+    add_options = staticmethod(add_options)
+
+    def _print_verbage(self):
+        """
+        Prints information about the OFDM demodulator
+        """
+        print "\nOFDM Demodulator:"
+        print "Modulation Type: %s"    % (self._modulation)
+        print "FFT length:      %3d"   % (self._fft_length)
+        print "Occupied Tones:  %3d"   % (self._occupied_tones)
+        print "CP length:       %3d"   % (self._cp_length)
+
+
+
+class _queue_watcher_thread(_threading.Thread):
+    def __init__(self, rcvd_pktq, callback):
+        _threading.Thread.__init__(self)
+        self.setDaemon(1)
+        self.rcvd_pktq = rcvd_pktq
+        self.callback = callback
+        self.keep_running = True
+        self.start()
+
+
+    def run(self):
+        while self.keep_running:
+            msg = self.rcvd_pktq.delete_head()
+            ok, payload = ofdm_packet_utils.unmake_packet(msg.to_string())
+            if self.callback:
+                self.callback(ok, payload)
+
+# Generating known symbols with:
+# i = [2*random.randint(0,1)-1 for i in range(4512)]
+
+known_symbols_200_1 = [1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0]
+        
+known_symbols_200_2 = [-1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0]
+
+
+known_symbols_4512_1 = [-1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 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+
+
+known_symbols_4512_impulse = 4512*[1,]
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diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py
deleted file mode 100644
index 9a98b374b0..0000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py
+++ /dev/null
@@ -1,229 +0,0 @@
-
-#
-# Copyright 2005,2006,2007 Free Software Foundation, Inc.
-# 
-# This file is part of GNU Radio
-# 
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-# 
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING.  If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-# 
-
-import math
-from math import pi
-from gnuradio import gr, ofdm_packet_utils
-import gnuradio.gr.gr_threading as _threading
-
-from gnuradio.blksimpl.ofdm_receiver import ofdm_receiver
-
-
-# /////////////////////////////////////////////////////////////////////////////
-#                   mod/demod with packets as i/o
-# /////////////////////////////////////////////////////////////////////////////
-
-class mod_ofdm_pkts(gr.hier_block):
-    """
-    Wrap an arbitrary digital modulator in our packet handling framework.
-
-    Send packets by calling send_pkt
-    """
-    def __init__(self, fg, options, msgq_limit=2, pad_for_usrp=True):
-        """
-	Hierarchical block for sending packets
-
-        Packets to be sent are enqueued by calling send_pkt.
-        The output is the complex modulated signal at baseband.
-
-	@param fg: flow graph
-	@type fg: flow graph
-        @param msgq_limit: maximum number of messages in message queue
-        @type msgq_limit: int
-        @param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
-
-        See modulators for remaining parameters
-        """
-        self._pad_for_usrp = pad_for_usrp
-
-        win = [] #[1 for i in range(self._fft_length)]
-
-        # hard-coded known symbol
-        ks1 = known_symbols_4512_1[0:options.occupied_tones]
-        #ks1 = known_symbols_4512_impulse[0:options.occupied_tones]
-        ks2 = known_symbols_4512_2[0:options.occupied_tones]
-                
-        symbol_length = options.fft_length + options.cp_length
-
-        # accepts messages from the outside world
-        self._pkt_input = gr.ofdm_bpsk_mapper(msgq_limit, options.occupied_tones, options.fft_length, ks1, ks2)
-        self.ifft = gr.fft_vcc(options.fft_length, False, win, True)
-        self.cp_adder = gr.ofdm_cyclic_prefixer(options.fft_length, symbol_length)
-        self.scale = gr.multiply_const_cc(1.0 / math.sqrt(options.fft_length))
-
-        fg.connect(self._pkt_input, self.ifft, self.cp_adder, self.scale)
-
-        if options.verbose:
-            self._print_verbage()
-
-        if 1:
-            fg.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length, "ofdm_mapper_c.dat"))
-
-        gr.hier_block.__init__(self, fg, None, self.scale)
-
-    def send_pkt(self, payload='', eof=False):
-        """
-        Send the payload.
-
-        @param payload: data to send
-        @type payload: string
-        """
-        if eof:
-            msg = gr.message(1) # tell self._pkt_input we're not sending any more packets
-        else:
-            # print "original_payload =", string_to_hex_list(payload)
-            pkt = ofdm_packet_utils.make_packet(payload,
-                                                self.samples_per_symbol(),
-                                                self.bits_per_symbol(),
-                                                self._pad_for_usrp)
-            #print "pkt =", string_to_hex_list(pkt)
-            msg = gr.message_from_string(pkt)
-        self._pkt_input.msgq().insert_tail(msg)
-
-    def samples_per_symbol(self):
-        return 2
-
-    def bits_per_symbol(self=None):   # staticmethod that's also callable on an instance
-        return 1
-    bits_per_symbol = staticmethod(bits_per_symbol)      # make it a static method.  RTFM
-
-    def add_options(normal, expert):
-        """
-        Adds OFDM-specific options to the Options Parser
-        """
-        expert.add_option("", "--fft-length", type="intx", default=512,
-                          help="set the number of FFT bins [default=%default]")
-        expert.add_option("", "--occupied-tones", type="intx", default=200,
-                          help="set the number of occupied FFT bins [default=%default]")
-        expert.add_option("", "--cp-length", type="intx", default=128,
-                          help="set the number of bits in the cyclic prefix [default=%default]")
-    # Make a static method to call before instantiation
-    add_options = staticmethod(add_options)
-
-    def _print_verbage(self):
-        """
-        Prints information about the OFDM modulator
-        """
-        print "\nOFDM Modulator:"
-        print "FFT length:      %3d"   % (self._fft_length)
-        print "Occupied Tones:  %3d"   % (self._occupied_tones)
-        print "CP length:       %3d"   % (self._cp_length)
-
-
-class demod_ofdm_pkts(gr.hier_block):
-    """
-    Wrap an arbitrary digital demodulator in our packet handling framework.
-
-    The input is complex baseband.  When packets are demodulated, they are passed to the
-    app via the callback.
-    """
-
-    def __init__(self, fg, options, callback=None):
-        """
-	Hierarchical block for demodulating and deframing packets.
-
-	The input is the complex modulated signal at baseband.
-        Demodulated packets are sent to the handler.
-
-	@param fg: flow graph
-	@type fg: flow graph
-        @param demodulator: instance of demodulator class (gr_block or hier_block)
-        @type demodulator: complex baseband in
-        @param callback:  function of two args: ok, payload
-        @type callback: ok: bool; payload: string
-	"""
-        self._rcvd_pktq = gr.msg_queue()          # holds packets from the PHY
-
-        ks1 = known_symbols_4512_1[0:options.occupied_tones]
-        #ks1 = known_symbols_4512_impulse[0:options.occupied_tones]
-        ks2 = known_symbols_4512_2[0:options.occupied_tones]
-        
-        symbol_length = options.fft_length + options.cp_length
-        self.ofdm_recv = ofdm_receiver(fg, options.fft_length, options.cp_length,
-                                       options.occupied_tones, options.snr, ks1, ks2)
-        self.ofdm_demod = gr.ofdm_frame_sink(self._rcvd_pktq,
-                                             options.occupied_tones)
-        
-        fg.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
-        fg.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
-
-        gr.hier_block.__init__(self, fg, self.ofdm_recv, None)
-        self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
-
-
-    def bits_per_symbol(self=None):   # staticmethod that's also callable on an instance
-        return 1
-    bits_per_symbol = staticmethod(bits_per_symbol)      # make it a static method.  RTFM
-
-    def add_options(normal, expert):
-        """
-        Adds OFDM-specific options to the Options Parser
-        """
-        expert.add_option("", "--fft-length", type="intx", default=512,
-                          help="set the number of FFT bins [default=%default]")
-        expert.add_option("", "--occupied-tones", type="intx", default=200,
-                          help="set the number of occupied FFT bins [default=%default]")
-        expert.add_option("", "--cp-length", type="intx", default=128,
-                          help="set the number of bits in the cyclic prefix [default=%default]")
-    # Make a static method to call before instantiation
-    add_options = staticmethod(add_options)
-
-    def _print_verbage(self):
-        """
-        Prints information about the OFDM demodulator
-        """
-        print "\nOFDM Demodulator:"
-        print "FFT length:      %3d"   % (self._fft_length)
-        print "Occupied Tones:  %3d"   % (self._occupied_tones)
-        print "CP length:       %3d"   % (self._cp_length)
-
-
-
-class _queue_watcher_thread(_threading.Thread):
-    def __init__(self, rcvd_pktq, callback):
-        _threading.Thread.__init__(self)
-        self.setDaemon(1)
-        self.rcvd_pktq = rcvd_pktq
-        self.callback = callback
-        self.keep_running = True
-        self.start()
-
-
-    def run(self):
-        while self.keep_running:
-            msg = self.rcvd_pktq.delete_head()
-            ok, payload = ofdm_packet_utils.unmake_packet(msg.to_string())
-            if self.callback:
-                self.callback(ok, payload)
-
-known_symbols_200_1 = [1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0]
-        
-known_symbols_200_2 = [-1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0]
-
-
-
-known_symbols_4512_1 = [-1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 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-1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1]
-
-
-known_symbols_4512_impulse = 4512*[1,]
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
index e2f5932836..22ec41f1d9 100644
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
@@ -22,10 +22,12 @@
 
 import math
 from gnuradio import gr
-from gnuradio.blksimpl.ofdm_sync import ofdm_sync
+from gnuradio.blksimpl.ofdm_sync_ml import ofdm_sync_ml
+from gnuradio.blksimpl.ofdm_sync_pn import ofdm_sync_pn
+from gnuradio.blksimpl.ofdm_sync_pnac import ofdm_sync_pnac
 
 class ofdm_receiver(gr.hier_block):
-    def __init__(self, fg, fft_length, cp_length, occupied_tones, snr, ks1, ks2):
+    def __init__(self, fg, fft_length, cp_length, occupied_tones, snr, ks, logging=False):
         self.fg = fg
 
         bw = (float(occupied_tones) / float(fft_length)) / 2.0
@@ -39,14 +41,21 @@ class ofdm_receiver(gr.hier_block):
         
         win = [1 for i in range(fft_length)]
 
-        self.ofdm_sync = ofdm_sync(fg, fft_length, cp_length, snr)
+        SYNC = "pn"
+        if SYNC == "ml":
+            self.ofdm_sync = ofdm_sync_ml(fg, fft_length, cp_length, snr, logging)
+        elif SYNC == "pn":
+            self.ofdm_sync = ofdm_sync_pn(fg, fft_length, cp_length, logging)
+        elif SYNC == "pnac":
+            self.ofdm_sync = ofdm_sync_pnac(fg, fft_length, cp_length, ks[0])
+
         self.fft_demod = gr.fft_vcc(fft_length, True, win, True)
         self.ofdm_corr  = gr.ofdm_correlator(occupied_tones, fft_length,
-                                             cp_length, ks1, ks2)
+                                             cp_length, ks[1], ks[2])
 
         self.fg.connect(self.chan_filt, self.ofdm_sync, self.fft_demod, self.ofdm_corr)
         
-        if 1:
+        if logging:
             self.fg.connect(self.chan_filt, gr.file_sink(gr.sizeof_gr_complex, "chan_filt_c.dat"))
             self.fg.connect(self.fft_demod, gr.file_sink(gr.sizeof_gr_complex*fft_length, "fft_out_c.dat"))
             self.fg.connect(self.ofdm_corr, gr.file_sink(gr.sizeof_gr_complex*occupied_tones, "ofdm_corr_out_c.dat"))
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py
deleted file mode 100644
index 271be93def..0000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py
+++ /dev/null
@@ -1,141 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 Free Software Foundation, Inc.
-# 
-# This file is part of GNU Radio
-# 
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-# 
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING.  If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-# 
-
-import math
-from gnuradio import gr
-
-class ofdm_sync(gr.hier_block):
-    def __init__(self, fg, fft_length, cp_length, snr):
-        self.fg = fg
-
-        self.input = gr.add_const_cc(0)
-
-        SNR = 10.0**(snr/10.0)
-        rho = SNR / (SNR + 1.0)
-        symbol_length = fft_length + cp_length
-
-        # ML Sync
-
-        # Energy Detection from ML Sync
-
-        # Create a delay line
-        self.delay = gr.delay(gr.sizeof_gr_complex, fft_length)
-        self.fg.connect(self.input, self.delay)
-
-        # magnitude squared blocks
-        self.magsqrd1 = gr.complex_to_mag_squared()
-        self.magsqrd2 = gr.complex_to_mag_squared()
-        self.adder = gr.add_ff()
-
-        moving_sum_taps = [rho/2 for i in range(cp_length)]
-        self.moving_sum_filter = gr.fir_filter_fff(1,moving_sum_taps)
-        
-        self.fg.connect(self.input,self.magsqrd1)
-        self.fg.connect(self.delay,self.magsqrd2)
-        self.fg.connect(self.magsqrd1,(self.adder,0))
-        self.fg.connect(self.magsqrd2,(self.adder,1))
-        self.fg.connect(self.adder,self.moving_sum_filter)
-        
-
-        # Correlation from ML Sync
-        self.conjg = gr.conjugate_cc();
-        self.mixer = gr.multiply_cc();
-
-        movingsum2_taps = [1.0 for i in range(cp_length)]
-        self.movingsum2 = gr.fir_filter_ccf(1,movingsum2_taps)
-        
-        # Correlator data handler
-        self.c2mag = gr.complex_to_mag()
-        self.angle = gr.complex_to_arg()
-        self.fg.connect(self.input,(self.mixer,1))
-        self.fg.connect(self.delay,self.conjg,(self.mixer,0))
-        self.fg.connect(self.mixer,self.movingsum2,self.c2mag)
-        self.fg.connect(self.movingsum2,self.angle)
-
-        # ML Sync output arg, need to find maximum point of this
-        self.diff = gr.sub_ff()
-        self.fg.connect(self.c2mag,(self.diff,0))
-        self.fg.connect(self.moving_sum_filter,(self.diff,1))
-
-        #ML measurements input to sampler block and detect
-        nco_sensitivity = 1.0/fft_length
-        self.f2c = gr.float_to_complex()
-        self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
-        self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
-        self.sample_and_hold = gr.sample_and_hold_ff()
-        self.nco = gr.frequency_modulator_fc(nco_sensitivity)
-        self.inv = gr.multiply_const_ff(-1)
-        self.sigmix = gr.multiply_cc()
-
-        # Mix the signal with an NCO controlled by the sync loop
-        self.fg.connect(self.input, (self.sigmix,0))
-        self.fg.connect(self.nco, (self.sigmix,1))
-        self.fg.connect(self.sigmix, (self.sampler,0))
-
-        # use the sync loop values to set the sampler and the NCO
-        #     self.diff = theta
-        #     self.angle = epsilon
-                          
-        self.fg.connect(self.diff, self.pk_detect)
-        use_dpll = 1
-
-        fixed_timing = 0
-        if fixed_timing:
-            # Use a fixed trigger point instead of sync block
-            peak_null = gr.null_sink(gr.sizeof_char)
-            data = 640*[0,]
-            data[639] = 1
-            peak_trigger = gr.vector_source_b(data, True)
-
-            self.fg.connect(self.pk_detect, peak_null)
-            self.fg.connect(peak_trigger, (self.sampler,1))
-            self.fg.connect(peak_trigger, (self.sample_and_hold,1))
-        else:
-            self.dpll = gr.dpll_bb(float(symbol_length),0.01)
-            if use_dpll:
-                self.fg.connect(self.pk_detect, self.dpll)
-                self.fg.connect(self.dpll, (self.sampler,1))
-                self.fg.connect(self.dpll, (self.sample_and_hold,1))
-            else:
-                self.fg.connect(self.pk_detect, (self.sampler,1))
-                self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
-            
-        self.fg.connect(self.angle, (self.sample_and_hold,0))
-        self.fg.connect(self.sample_and_hold, self.inv, self.nco)
-
-        if 1:
-            self.fg.connect(self.diff, gr.file_sink(gr.sizeof_float, "theta_f.dat"))
-            self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float, "epsilon_f.dat"))
-            if fixed_timing:
-                self.fg.connect(peak_trigger, gr.file_sink(gr.sizeof_char, "peaks_b.dat"))
-            else:
-                self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "peaks_b.dat"))
-                if use_dpll:
-                    self.fg.connect(self.dpll, gr.file_sink(gr.sizeof_char, "dpll_b.dat"))
-
-            self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "sigmix_c.dat"))
-            self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "sampler_c.dat"))
-            self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "sample_and_hold_f.dat"))
-            self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "nco_c.dat"))
-            self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "input_c.dat"))
-
-        gr.hier_block.__init__(self, fg, self.input, self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py
new file mode 100644
index 0000000000..bd5f4b8707
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+import math
+from gnuradio import gr
+
+class ofdm_sync_fixed(gr.hier_block):
+    def __init__(self, fg, fft_length, cp_length, snr):
+        self.fg = fg
+
+        # Use a fixed trigger point instead of sync block
+        data = (fft_length+cp_len)*[0,]
+        data[(fft_length+cp_len)-1] = 1
+        peak_trigger = gr.vector_source_b(data, True)
+        
+        self.fg.connect(peak_trigger, (self.sampler,1))
+
+        if 1:
+            self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length,
+                                                       "ofdm_sync_fixed-sampler_c.dat"))
+        
+        gr.hier_block.__init__(self, fg, (self.sampler,0), self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
new file mode 100644
index 0000000000..6944cb81c5
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+import math
+from gnuradio import gr
+
+class ofdm_sync_ml(gr.hier_block):
+    def __init__(self, fg, fft_length, cp_length, snr, logging):
+        ''' Maximum Likelihood OFDM synchronizer:
+        J. van de Beek, M. Sandell, and P. O. Borjesson, "ML Estimation
+        of Time and Frequency Offset in OFDM Systems," IEEE Trans.
+        Signal Processing, vol. 45, no. 7, pp. 1800-1805, 1997.
+        '''
+
+        self.fg = fg
+
+        # FIXME: when converting to hier_block2's, the output signature
+        # should be the output of the divider (the normalized peaks) and
+        # the angle value out of the sample and hold block
+
+        self.input = gr.add_const_cc(0)
+
+        SNR = 10.0**(snr/10.0)
+        rho = SNR / (SNR + 1.0)
+        symbol_length = fft_length + cp_length
+
+        # ML Sync
+
+        # Energy Detection from ML Sync
+
+        # Create a delay line
+        self.delay = gr.delay(gr.sizeof_gr_complex, fft_length)
+        self.fg.connect(self.input, self.delay)
+
+        # magnitude squared blocks
+        self.magsqrd1 = gr.complex_to_mag_squared()
+        self.magsqrd2 = gr.complex_to_mag_squared()
+        self.adder = gr.add_ff()
+
+        moving_sum_taps = [rho/2 for i in range(cp_length)]
+        self.moving_sum_filter = gr.fir_filter_fff(1,moving_sum_taps)
+        
+        self.fg.connect(self.input,self.magsqrd1)
+        self.fg.connect(self.delay,self.magsqrd2)
+        self.fg.connect(self.magsqrd1,(self.adder,0))
+        self.fg.connect(self.magsqrd2,(self.adder,1))
+        self.fg.connect(self.adder,self.moving_sum_filter)
+        
+
+        # Correlation from ML Sync
+        self.conjg = gr.conjugate_cc();
+        self.mixer = gr.multiply_cc();
+
+        movingsum2_taps = [1.0 for i in range(cp_length)]
+        self.movingsum2 = gr.fir_filter_ccf(1,movingsum2_taps)
+        
+        # Correlator data handler
+        self.c2mag = gr.complex_to_mag()
+        self.angle = gr.complex_to_arg()
+        self.fg.connect(self.input,(self.mixer,1))
+        self.fg.connect(self.delay,self.conjg,(self.mixer,0))
+        self.fg.connect(self.mixer,self.movingsum2,self.c2mag)
+        self.fg.connect(self.movingsum2,self.angle)
+
+        # ML Sync output arg, need to find maximum point of this
+        self.diff = gr.sub_ff()
+        self.fg.connect(self.c2mag,(self.diff,0))
+        self.fg.connect(self.moving_sum_filter,(self.diff,1))
+
+        #ML measurements input to sampler block and detect
+        nco_sensitivity = -1.0/fft_length
+        self.f2c = gr.float_to_complex()
+        self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
+        self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
+        self.sample_and_hold = gr.sample_and_hold_ff()
+        self.nco = gr.frequency_modulator_fc(nco_sensitivity)
+        self.sigmix = gr.multiply_cc()
+
+        # Mix the signal with an NCO controlled by the sync loop
+        self.fg.connect(self.input, (self.sigmix,0))
+        self.fg.connect(self.nco, (self.sigmix,1))
+        self.fg.connect(self.sigmix, (self.sampler,0))
+
+        # use the sync loop values to set the sampler and the NCO
+        #     self.diff = theta
+        #     self.angle = epsilon
+                          
+        self.fg.connect(self.diff, self.pk_detect)
+
+        use_dpll = 1
+        if use_dpll:
+            self.dpll = gr.dpll_bb(float(symbol_length),0.01)
+            self.fg.connect(self.pk_detect, self.dpll)
+            self.fg.connect(self.dpll, (self.sampler,1))
+            self.fg.connect(self.dpll, (self.sample_and_hold,1))
+        else:
+            self.fg.connect(self.pk_detect, (self.sampler,1))
+            self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
+            
+        self.fg.connect(self.angle, (self.sample_and_hold,0))
+        self.fg.connect(self.sample_and_hold, self.nco)
+
+        if logging:
+            self.fg.connect(self.diff, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-theta_f.dat"))
+            self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-epsilon_f.dat"))
+            self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "ofdm_sync_ml-peaks_b.dat"))
+            if use_dpll:
+                self.fg.connect(self.dpll, gr.file_sink(gr.sizeof_char, "ofdm_sync_ml-dpll_b.dat"))
+
+            self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-sigmix_c.dat"))
+            self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "ofdm_sync_ml-sampler_c.dat"))
+            self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-sample_and_hold_f.dat"))
+            self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-nco_c.dat"))
+            self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-input_c.dat"))
+
+        gr.hier_block.__init__(self, fg, self.input, self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
new file mode 100644
index 0000000000..a49ff84f9c
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+import math
+from numpy import fft
+from gnuradio import gr
+
+class ofdm_sync_pn(gr.hier_block):
+    def __init__(self, fg, fft_length, cp_length, logging=False):
+        ''' OFDM synchronization using PN Correlation:
+        T. M. Schmidl and D. C. Cox, "Robust Frequency and Timing
+        Synchonization for OFDM," IEEE Trans. Communications, vol. 45,
+        no. 12, 1997.
+        '''
+        
+        self.fg = fg
+
+        # FIXME: when converting to hier_block2's, the output signature
+        # should be the output of the divider (the normalized peaks) and
+        # the angle value out of the sample and hold block
+            
+        self.input = gr.add_const_cc(0)
+
+        symbol_length = fft_length + cp_length
+
+        # PN Sync
+
+        # Create a delay line
+        self.delay = gr.delay(gr.sizeof_gr_complex, fft_length/2)
+
+        # Correlation from ML Sync
+        self.conjg = gr.conjugate_cc();
+        self.corr = gr.multiply_cc();
+
+        # Create a moving sum filter for the corr output
+        if 1:
+            moving_sum_taps = [1.0 for i in range(fft_length//2)]
+            self.moving_sum_filter = gr.fir_filter_ccf(1,moving_sum_taps)
+        else:
+            moving_sum_taps = [complex(1.0,0.0) for i in range(fft_length//2)]
+            self.moving_sum_filter = gr.fft_filter_ccc(1,moving_sum_taps)
+
+        # Create a moving sum filter for the input
+        self.inputmag2 = gr.complex_to_mag_squared()
+        movingsum2_taps = [1.0 for i in range(fft_length//2)]
+
+        if 1:
+            self.inputmovingsum = gr.fir_filter_fff(1,movingsum2_taps)
+        else:
+            self.inputmovingsum = gr.fft_filter_fff(1,movingsum2_taps)
+
+        self.square = gr.multiply_ff()
+        self.normalize = gr.divide_ff()
+     
+        # Get magnitude (peaks) and angle (phase/freq error)
+        self.c2mag = gr.complex_to_mag_squared()
+        self.angle = gr.complex_to_arg()
+
+        self.sample_and_hold = gr.sample_and_hold_ff()
+
+        # Mix the signal with an NCO controlled by the sync loop
+        nco_sensitivity = -2.0/fft_length
+        self.nco = gr.frequency_modulator_fc(nco_sensitivity)
+        self.sigmix = gr.multiply_cc()
+
+        #ML measurements input to sampler block and detect
+        self.sub1 = gr.add_const_ff(-1)
+        self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
+        self.regen = gr.regenerate_bb(symbol_length)
+
+        self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
+        
+        self.fg.connect(self.input, self.delay)
+        self.fg.connect(self.input, (self.corr,0))
+        self.fg.connect(self.delay, self.conjg)
+        self.fg.connect(self.conjg, (self.corr,1))
+        self.fg.connect(self.corr, self.moving_sum_filter)
+        self.fg.connect(self.moving_sum_filter, self.c2mag)
+        self.fg.connect(self.moving_sum_filter, self.angle)
+        self.fg.connect(self.angle, (self.sample_and_hold,0))
+        self.fg.connect(self.sample_and_hold, self.nco)
+
+        self.fg.connect(self.input, (self.sigmix,0))
+        self.fg.connect(self.nco, (self.sigmix,1))
+        self.fg.connect(self.sigmix, (self.sampler,0))
+
+        self.fg.connect(self.input, self.inputmag2, self.inputmovingsum)
+        self.fg.connect(self.inputmovingsum, (self.square,0))
+        self.fg.connect(self.inputmovingsum, (self.square,1))
+        self.fg.connect(self.square, (self.normalize,1))
+        self.fg.connect(self.c2mag, (self.normalize,0))
+
+        # Create a moving sum filter for the corr output
+        matched_filter_taps = [1.0/cp_length for i in range(cp_length)]
+        self.matched_filter = gr.fir_filter_fff(1,matched_filter_taps)
+        self.fg.connect(self.normalize, self.matched_filter)
+        
+        self.fg.connect(self.matched_filter, self.sub1, self.pk_detect)
+        self.fg.connect(self.pk_detect, self.regen)
+        self.fg.connect(self.regen, (self.sampler,1))
+        self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
+
+
+        if logging:
+            self.fg.connect(self.matched_filter, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-mf_f.dat"))
+            self.fg.connect(self.normalize, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-theta_f.dat"))
+            self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-epsilon_f.dat"))
+            self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "ofdm_sync_pn-peaks_b.dat"))
+            self.fg.connect(self.regen, gr.file_sink(gr.sizeof_char, "ofdm_sync_pn-regen_b.dat"))
+            self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-sigmix_c.dat"))
+            self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "ofdm_sync_pn-sampler_c.dat"))
+            self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-sample_and_hold_f.dat"))
+            self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-nco_c.dat"))
+            self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-input_c.dat"))
+
+        gr.hier_block.__init__(self, fg, self.input, self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py
new file mode 100644
index 0000000000..833cee57dd
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py
@@ -0,0 +1,126 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+import math
+from numpy import fft
+from gnuradio import gr
+
+class ofdm_sync_pnac(gr.hier_block):
+    def __init__(self, fg, fft_length, cp_length, ks):
+        self.fg = fg
+
+        # FIXME: when converting to hier_block2's, the output signature
+        # should be the output of the divider (the normalized peaks) and
+        # the angle value out of the sample and hold block
+            
+        self.input = gr.add_const_cc(0)
+
+        symbol_length = fft_length + cp_length
+
+        # PN Sync
+
+        # autocorrelate with the known symbol
+        ks = ks[0:fft_length//2]
+        ks.reverse()
+        self.crosscorr_filter = gr.fir_filter_ccc(1, ks)
+        self.fg.connect(self.crosscorr_filter, gr.file_sink(gr.sizeof_gr_complex, "crosscorr.dat"))
+        
+        # Create a delay line
+        self.delay = gr.delay(gr.sizeof_gr_complex, fft_length/2)
+
+        # Correlation from ML Sync
+        self.conjg = gr.conjugate_cc();
+        self.corr = gr.multiply_cc();
+
+        # Create a moving sum filter for the corr output
+        moving_sum_taps = [1.0 for i in range(fft_length//2)]
+        self.moving_sum_filter = gr.fir_filter_ccf(1,moving_sum_taps)
+
+        # Create a moving sum filter for the input
+        self.inputmag2 = gr.complex_to_mag_squared()
+        movingsum2_taps = [1.0 for i in range(fft_length/2)]
+        self.inputmovingsum = gr.fir_filter_fff(1,movingsum2_taps)
+        self.square = gr.multiply_ff()
+        self.normalize = gr.divide_ff()
+     
+        # Get magnitude (peaks) and angle (phase/freq error)
+        self.c2mag = gr.complex_to_mag_squared()
+        self.angle = gr.complex_to_arg()
+
+        self.sample_and_hold = gr.sample_and_hold_ff()
+
+        # Mix the signal with an NCO controlled by the sync loop
+        nco_sensitivity = -1.0/fft_length
+        self.nco = gr.frequency_modulator_fc(nco_sensitivity)
+        self.sigmix = gr.multiply_cc()
+
+        #ML measurements input to sampler block and detect
+        self.sub1 = gr.add_const_ff(-1)
+        self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
+
+        self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
+        
+        self.fg.connect(self.input, self.crosscorr_filter)
+        self.fg.connect(self.crosscorr_filter, self.delay)
+        self.fg.connect(self.crosscorr_filter, (self.corr,0))
+        self.fg.connect(self.delay, self.conjg)
+        self.fg.connect(self.conjg, (self.corr,1))
+        self.fg.connect(self.corr, self.moving_sum_filter)
+        self.fg.connect(self.moving_sum_filter, self.c2mag)
+        self.fg.connect(self.moving_sum_filter, self.angle)
+        self.fg.connect(self.angle, (self.sample_and_hold,0))
+        self.fg.connect(self.sample_and_hold, self.nco)
+
+        self.fg.connect(self.input, (self.sigmix,0))
+        self.fg.connect(self.nco, (self.sigmix,1))
+        self.fg.connect(self.sigmix, (self.sampler,0))
+
+        self.fg.connect(self.input, self.inputmag2, self.inputmovingsum)
+        self.fg.connect(self.inputmovingsum, (self.square,0))
+        self.fg.connect(self.inputmovingsum, (self.square,1))
+        self.fg.connect(self.square, (self.normalize,1))
+        self.fg.connect(self.c2mag, (self.normalize,0))
+        self.fg.connect(self.normalize, self.sub1, self.pk_detect)
+
+        self.fg.connect(self.pk_detect, (self.sampler,1))
+        self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
+            
+
+        if 1:
+            self.fg.connect(self.normalize, gr.file_sink(gr.sizeof_float,
+                                                         "ofdm_sync_pnac-theta_f.dat"))
+            self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float,
+                                                     "ofdm_sync_pnac-epsilon_f.dat"))
+            self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char,
+                                                         "ofdm_sync_pnac-peaks_b.dat"))
+            self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex,
+                                                      "ofdm_sync_pnac-sigmix_c.dat"))
+            self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length,
+                                                       "ofdm_sync_pnac-sampler_c.dat"))
+            self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float,
+                                                               "ofdm_sync_pnac-sample_and_hold_f.dat"))
+            self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex,
+                                                   "ofdm_sync_pnac-nco_c.dat"))
+            self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex,
+                                                     "ofdm_sync_pnac-input_c.dat"))
+
+        gr.hier_block.__init__(self, fg, self.input, self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/gr/Makefile.am b/gnuradio-core/src/python/gnuradio/gr/Makefile.am
index dc0e4a8a3d..92b3b66638 100644
--- a/gnuradio-core/src/python/gnuradio/gr/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/gr/Makefile.am
@@ -80,6 +80,7 @@ noinst_PYTHON = 			\
 	qa_mute.py			\
 	qa_nlog10.py			\
 	qa_noise.py			\
+	qa_ofdm_insert_preamble.py	\
 	qa_packed_to_unpacked.py	\
 	qa_pipe_fittings.py		\
 	qa_pll_carriertracking.py	\
diff --git a/gnuradio-core/src/python/gnuradio/gr/qa_ofdm_insert_preamble.py b/gnuradio-core/src/python/gnuradio/gr/qa_ofdm_insert_preamble.py
new file mode 100755
index 0000000000..58edb8298b
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/gr/qa_ofdm_insert_preamble.py
@@ -0,0 +1,179 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+# 
+# This file is part of GNU Radio
+# 
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+# 
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+from gnuradio import gr, gr_unittest
+from pprint import pprint
+
+class testing (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.fg = gr.flow_graph ()
+
+    def tearDown (self):
+        self.fg = None
+
+    def helper(self, v0, v1, fft_length, preamble):
+        fg = self.fg
+        src0 = gr.vector_source_c(v0)
+        src1 = gr.vector_source_b(v1)
+        
+        s2v = gr.stream_to_vector(gr.sizeof_gr_complex, fft_length)
+
+        # print "len(v) = %d" % (len(v))
+
+        op = gr.ofdm_insert_preamble(fft_length, preamble)
+
+        v2s = gr.vector_to_stream(gr.sizeof_gr_complex, fft_length)
+        dst0 = gr.vector_sink_c()
+        dst1 = gr.vector_sink_b()
+
+        fg.connect(src0, s2v, (op, 0))
+        fg.connect(src1, (op, 1))
+        fg.connect((op, 0), v2s, dst0)
+        fg.connect((op, 1), dst1)
+
+        fg.run()
+        r0 = dst0.data()
+        r0v = []
+        for i in range(len(r0)//fft_length):
+            r0v.append(r0[i*fft_length:(i+1)*fft_length])
+            
+        r1 = dst1.data()
+        self.assertEqual(len(r0v), len(r1))
+        return (r1, r0v)
+        
+    def check_match(self, actual, expected_list):
+        lst = []
+        map(lambda x: lst.append(x), expected_list)
+        self.assertEqual(actual, lst)
+
+
+    # ----------------------------------------------------------------
+
+    def test_000(self):
+        # no preamble, 1 symbol payloads
+
+        preamble = ()
+        fft_length = 8
+        npayloads = 8
+        v = []
+        p = []
+        for i in range(npayloads):
+            t = fft_length*[(i + i*1j)]
+            p.append(tuple(t))
+            v += t
+
+        p = tuple(p)
+            
+        r = self.helper(v, npayloads*[1], fft_length, preamble)
+        # pprint(r)
+
+        self.assertEqual(r[0], tuple(npayloads*[1]))
+        self.check_match(r[1], (p[0],p[1],p[2],p[3],p[4],p[5],p[6],p[7]))
+            
+
+    def test_001(self):
+        # 1 symbol preamble, 1 symbol payloads
+        preamble = ((100, 101, 102, 103, 104, 105, 106, 107),)
+        p0 = preamble[0]
+        fft_length = 8
+        npayloads = 8
+        v = []
+        p = []
+        for i in range(npayloads):
+            t = fft_length*[(i + i*1j)]
+            p.append(tuple(t))
+            v += t
+
+        
+        r = self.helper(v, npayloads*[1], fft_length, preamble)
+
+        self.assertEqual(r[0], tuple(npayloads*[1, 0]))
+        self.check_match(r[1], (p0, p[0],
+                                p0, p[1],
+                                p0, p[2],
+                                p0, p[3],
+                                p0, p[4],
+                                p0, p[5],
+                                p0, p[6],
+                                p0, p[7]))
+
+    def test_002(self):
+        # 2 symbol preamble, 1 symbol payloads
+        preamble = ((100, 101, 102, 103, 104, 105, 106, 107),
+                    (200, 201, 202, 203, 204, 205, 206, 207))
+        p0 = preamble[0]
+        p1 = preamble[1]
+
+        fft_length = 8
+        npayloads = 8
+        v = []
+        p = []
+        for i in range(npayloads):
+            t = fft_length*[(i + i*1j)]
+            p.append(tuple(t))
+            v += t
+        
+        r = self.helper(v, npayloads*[1], fft_length, preamble)
+
+        self.assertEqual(r[0], tuple(npayloads*[1, 0, 0]))
+        self.check_match(r[1], (p0, p1, p[0],
+                                p0, p1, p[1],
+                                p0, p1, p[2],
+                                p0, p1, p[3],
+                                p0, p1, p[4],
+                                p0, p1, p[5],
+                                p0, p1, p[6],
+                                p0, p1, p[7]))
+
+
+    def xtest_003_preamble(self):
+        # 2 symbol preamble, 2 symbol payloads
+        preamble = ((100, 101, 102, 103, 104, 105, 106, 107),
+                    (200, 201, 202, 203, 204, 205, 206, 207))
+        p0 = preamble[0]
+        p1 = preamble[1]
+
+        fft_length = 8
+        npayloads = 8
+        v = []
+        p = []
+        for i in range(npayloads * 2):
+            t = fft_length*[(i + i*1j)]
+            p.append(tuple(t))
+            v += t
+        
+        r = self.helper(v, npayloads*[1, 0], fft_length, preamble)
+
+        self.assertEqual(r[0], tuple(npayloads*[1, 0, 0, 0]))
+        self.check_match(r[1], (p0, p1, p[0],  p[1],
+                                p0, p1, p[2],  p[3],
+                                p0, p1, p[4],  p[5],
+                                p0, p1, p[6],  p[7],
+                                p0, p1, p[8],  p[9],
+                                p0, p1, p[10], p[11],
+                                p0, p1, p[12], p[13],
+                                p0, p1, p[14], p[15]))
+
+
+if __name__ == '__main__':
+    gr_unittest.main ()
diff --git a/gnuradio-core/src/python/gnuradio/ofdm_packet_utils.py b/gnuradio-core/src/python/gnuradio/ofdm_packet_utils.py
index 006ca6de28..463284d616 100644
--- a/gnuradio-core/src/python/gnuradio/ofdm_packet_utils.py
+++ b/gnuradio-core/src/python/gnuradio/ofdm_packet_utils.py
@@ -96,7 +96,7 @@ def make_header(payload_len, whitener_offset=0):
     return struct.pack('!HH', val, val)
 
 def make_packet(payload, samples_per_symbol, bits_per_symbol,
-                pad_for_usrp=True, whitener_offset=0, dowhiten=1):
+                pad_for_usrp=True, whitener_offset=0, whitening=True):
     """
     Build a packet, given access code, payload, and whitener offset
 
@@ -106,10 +106,13 @@ def make_packet(payload, samples_per_symbol, bits_per_symbol,
     @param bits_per_symbol:       (needed for padding calculation)
     @type bits_per_symbol:        int
     @param whitener_offset        offset into whitener string to use [0-16)
+    @param whitening:             Turn whitener on or off
+    @type whitening:              bool
     
     Packet will have access code at the beginning, followed by length, payload
     and finally CRC-32.
     """
+
     if not whitener_offset >=0 and whitener_offset < 16:
         raise ValueError, "whitener_offset must be between 0 and 15, inclusive (%i)" % (whitener_offset,)
 
@@ -129,7 +132,7 @@ def make_packet(payload, samples_per_symbol, bits_per_symbol,
         usrp_packing = _npadding_bytes(packet_length, samples_per_symbol, bits_per_symbol) * '\x55'
         pkt_dt = pkt_dt + usrp_packing
 
-    if(dowhiten):
+    if(whitening):
         pkt = pkt_hd + whiten(pkt_dt, whitener_offset)
     else:
         pkt = pkt_hd + pkt_dt
@@ -147,8 +150,10 @@ def _npadding_bytes(pkt_byte_len, samples_per_symbol, bits_per_symbol):
     is a multiple of 128 samples.
 
     @param ptk_byte_len: len in bytes of packet, not including padding.
-    @param samples_per_symbol: samples per bit (1 bit / symbolwith GMSK)
+    @param samples_per_symbol: samples per bit (1 bit / symbolwidth GMSK)
     @type samples_per_symbol: int
+    @param bits_per_symbol: bits per symbol (log2(modulation order))
+    @type bits_per_symbol: int
 
     @returns number of bytes of padding to append.
     """
@@ -160,13 +165,17 @@ def _npadding_bytes(pkt_byte_len, samples_per_symbol, bits_per_symbol):
     return byte_modulus - r
     
 
-def unmake_packet(whitened_payload_with_crc, whitener_offset=0, dodewhiten=1):
+def unmake_packet(whitened_payload_with_crc, whitener_offset=0, dewhitening=1):
     """
     Return (ok, payload)
 
     @param whitened_payload_with_crc: string
+    @param whitener_offset        offset into whitener string to use [0-16)
+    @param dewhitening:           Turn whitener on or off
+    @type  dewhitening:           bool
     """
-    if dodewhiten:
+
+    if dewhitening:
         payload_with_crc = dewhiten(whitened_payload_with_crc, whitener_offset)
     else:
         payload_with_crc = whitened_payload_with_crc
diff --git a/gnuradio-core/src/python/gnuradio/packet_utils.py b/gnuradio-core/src/python/gnuradio/packet_utils.py
index e4de621337..dad050c8d3 100644
--- a/gnuradio-core/src/python/gnuradio/packet_utils.py
+++ b/gnuradio-core/src/python/gnuradio/packet_utils.py
@@ -157,8 +157,10 @@ def _npadding_bytes(pkt_byte_len, samples_per_symbol, bits_per_symbol):
     is a multiple of 128 samples.
 
     @param ptk_byte_len: len in bytes of packet, not including padding.
-    @param samples_per_symbol: samples per bit (1 bit / symbolwith GMSK)
+    @param samples_per_symbol: samples per bit (1 bit / symbolwidth GMSK)
     @type samples_per_symbol: int
+    @param bits_per_symbol: bits per symbol (log2(modulation order))
+    @type bits_per_symbol: int
 
     @returns number of bytes of padding to append.
     """
-- 
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