merge ordm/receiver branch -r5574:5659. Reworks OFDM receiver with refactored OFDM blocks. A few bug fixes for other blocks have also been slipped in.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5661 221aa14e-8319-0410-a670-987f0aec2ac5
author: trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5> 2007-06-04 16:08:44 +0000
committer: trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5> 2007-06-04 16:08:44 +0000
commit: c7dbfcc7d78275f76d8c2a8ef21e3100721874be (patch)
tree: c57b7b49ba153b6858a86de8714c2737f55bbc26 /gnuradio-core/src/python/gnuradio/blksimpl
parent: d476abb6debdf8ef5c0adf97af50a9b704605e2a (diff)
5 files changed, 360 insertions, 40 deletions
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am b/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
index 381340c42f..b8c8001101 100644
--- a/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
@@ -29,6 +29,7 @@ grblkspythondir = $(grpythondir)/blksimpl
 grblkspython_PYTHON =		\
 	__init__.py		\
 	am_demod.py		\
+	channel_model.py	\
 	dbpsk.py		\
 	dqpsk.py		\
 	d8psk.py		\
@@ -40,6 +41,8 @@ grblkspython_PYTHON =		\
 	nbfm_rx.py		\
 	nbfm_tx.py		\
 	ofdm_pkt.py		\
+	ofdm_receiver.py	\
+	ofdm_sync.py		\
 	pkt.py			\
 	psk.py			\
 	qam.py			\
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py b/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py
new file mode 100644
index 0000000000..c7b3f07b84
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/channel_model.py
@@ -0,0 +1,50 @@
+#!/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
+
+class channel_model(gr.hier_block):
+    def __init__(self, fg, noise_voltage=0.0, frequency_offset=0.0, epsilon=1.0, taps=[1.0,0.0]):
+        ''' Creates a channel model that includes:
+          - AWGN noise power in terms of noise voltage
+          - A frequency offest in the channel in ratio
+          - A timing offset ratio to model clock difference (epsilon)
+          - Multipath taps
+          '''
+
+        print epsilon
+        self.timing_offset = gr.fractional_interpolator_cc(0, epsilon)
+        
+        self.multipath = gr.fir_filter_ccc(1, taps)
+        
+        self.noise_adder = gr.add_cc()
+        self.noise = gr.noise_source_c(gr.GR_GAUSSIAN,noise_voltage)
+        self.freq_offset = gr.sig_source_c(1, gr.GR_SIN_WAVE, frequency_offset, 1.0, 0.0)
+        self.mixer_offset = gr.multiply_cc()
+
+        fg.connect(self.timing_offset, self.multipath)
+        fg.connect(self.multipath, (self.mixer_offset,0))
+        fg.connect(self.freq_offset,(self.mixer_offset,1))
+        fg.connect(self.mixer_offset, (self.noise_adder,1))
+        fg.connect(self.noise, (self.noise_adder,0))
+        
+        gr.hier_block.__init__(self, fg, self.timing_offset, self.noise_adder)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py
index 355455da18..9a98b374b0 100644
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_pkt.py
@@ -1,3 +1,4 @@
+
 #
 # Copyright 2005,2006,2007 Free Software Foundation, Inc.
 # 
@@ -19,10 +20,13 @@
 # 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
@@ -34,7 +38,7 @@ class mod_ofdm_pkts(gr.hier_block):
 
     Send packets by calling send_pkt
     """
-    def __init__(self, fg, modulator, access_code=None, msgq_limit=2, pad_for_usrp=True):
+    def __init__(self, fg, options, msgq_limit=2, pad_for_usrp=True):
         """
 	Hierarchical block for sending packets
 
@@ -43,29 +47,38 @@ class mod_ofdm_pkts(gr.hier_block):
 
 	@param fg: flow graph
 	@type fg: flow graph
-        @param modulator: instance of modulator class (gr_block or hier_block)
-        @type modulator: complex baseband out
-        @param access_code: AKA sync vector
-        @type access_code: string of 1's and 0's between 1 and 64 long
         @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._modulator = modulator
         self._pad_for_usrp = pad_for_usrp
 
-        if access_code is None:
-            access_code = ofdm_packet_utils.default_access_code
-        if not ofdm_packet_utils.is_1_0_string(access_code):
-            raise ValueError, "Invalid access_code %r. Must be string of 1's and 0's" % (access_code,)
-        self._access_code = access_code
+        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.message_vector_source(self._modulator.mtu(), msgq_limit)
-        fg.connect(self._pkt_input, self._modulator)
-        gr.hier_block.__init__(self, fg, None, self._modulator)
+        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):
         """
@@ -79,14 +92,41 @@ class mod_ofdm_pkts(gr.hier_block):
         else:
             # print "original_payload =", string_to_hex_list(payload)
             pkt = ofdm_packet_utils.make_packet(payload,
-                                                self._modulator.samples_per_symbol(),
-                                                self._modulator.bits_per_symbol(),
-                                                self._access_code,
+                                                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):
@@ -97,7 +137,7 @@ class demod_ofdm_pkts(gr.hier_block):
     app via the callback.
     """
 
-    def __init__(self, fg, demodulator, access_code=None, callback=None, threshold=-1):
+    def __init__(self, fg, options, callback=None):
         """
 	Hierarchical block for demodulating and deframing packets.
 
@@ -108,36 +148,54 @@ class demod_ofdm_pkts(gr.hier_block):
 	@type fg: flow graph
         @param demodulator: instance of demodulator class (gr_block or hier_block)
         @type demodulator: complex baseband in
-        @param access_code: AKA sync vector
-        @type access_code: string of 1's and 0's
         @param callback:  function of two args: ok, payload
         @type callback: ok: bool; payload: string
-        @param threshold: detect access_code with up to threshold bits wrong (-1 -> use default)
-        @type threshold: int
 	"""
+        self._rcvd_pktq = gr.msg_queue()          # holds packets from the PHY
 
-        self._demodulator = demodulator
-        if access_code is None:
-            access_code = ofdm_packet_utils.default_access_code
-        if not ofdm_packet_utils.is_1_0_string(access_code):
-            raise ValueError, "Invalid access_code %r. Must be string of 1's and 0's" % (access_code,)
-        self._access_code = access_code
+        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))
 
-        if threshold == -1:
-            threshold = 12              # FIXME raise exception
+        gr.hier_block.__init__(self, fg, self.ofdm_recv, None)
+        self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
 
-        self._rcvd_pktq = gr.msg_queue()          # holds packets from the PHY
-        self.bytes_to_bits = gr.packed_to_unpacked_bb(1, gr.GR_MSB_FIRST)
-        self.correlator = gr.correlate_access_code_bb(access_code, threshold)
 
-        self.framer_sink = gr.framer_sink_1(self._rcvd_pktq)
-        fg.connect(self._demodulator, self.bytes_to_bits, self.correlator, self.framer_sink)
+    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)
 
-        if 0:
-            fg.connect(self.bytes_to_bits, gr.file_sink(gr.sizeof_char, "received_bits.out"))
-        
-        gr.hier_block.__init__(self, fg, self._demodulator, None)
-        self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
 
 
 class _queue_watcher_thread(_threading.Thread):
@@ -156,3 +214,16 @@ class _queue_watcher_thread(_threading.Thread):
             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
new file mode 100644
index 0000000000..e2f5932836
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+#
+# 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 gnuradio import gr
+from gnuradio.blksimpl.ofdm_sync import ofdm_sync
+
+class ofdm_receiver(gr.hier_block):
+    def __init__(self, fg, fft_length, cp_length, occupied_tones, snr, ks1, ks2):
+        self.fg = fg
+
+        bw = (float(occupied_tones) / float(fft_length)) / 2.0
+        tb = bw*0.08
+        chan_coeffs = gr.firdes.low_pass (1.0,                     # gain
+                                          1.0,                     # sampling rate
+                                          bw+tb,                   # midpoint of trans. band
+                                          tb,                      # width of trans. band
+                                          gr.firdes.WIN_HAMMING)   # filter type
+        self.chan_filt = gr.fft_filter_ccc(1, chan_coeffs)
+        
+        win = [1 for i in range(fft_length)]
+
+        self.ofdm_sync = ofdm_sync(fg, fft_length, cp_length, snr)
+        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)
+
+        self.fg.connect(self.chan_filt, self.ofdm_sync, self.fft_demod, self.ofdm_corr)
+        
+        if 1:
+            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"))
+            self.fg.connect((self.ofdm_corr,1), gr.file_sink(1, "found_corr_b.dat"))
+
+        gr.hier_block.__init__(self, fg, self.chan_filt, self.ofdm_corr)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py
new file mode 100644
index 0000000000..271be93def
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync.py
@@ -0,0 +1,141 @@
+#!/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)
author	trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5>	2007-06-04 16:08:44 +0000
committer	trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5>	2007-06-04 16:08:44 +0000
commit	c7dbfcc7d78275f76d8c2a8ef21e3100721874be (patch)
tree	c57b7b49ba153b6858a86de8714c2737f55bbc26 /gnuradio-core/src/python/gnuradio/blksimpl
parent	d476abb6debdf8ef5c0adf97af50a9b704605e2a (diff)