-#!/usr/bin/env python

-#

-# Copyright 2006,2007,2008 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 3, 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, ofdm_packet_utils

-import gnuradio.gr.gr_threading as _threading

-import psk, qam

-

-from gnuradio.blks2impl.ofdm_receiver import ofdm_receiver

-

-

-# /////////////////////////////////////////////////////////////////////////////

-# mod/demod with packets as i/o

-# /////////////////////////////////////////////////////////////////////////////

-

-class ofdm_mod(gr.hier_block2):

- """

- 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, 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 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

- """

-

- gr.hier_block2.__init__(self, "ofdm_mod",

- gr.io_signature(0, 0, 0), # Input signature

- gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature

-

- 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,)

-

- 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

-

- mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}

- arity = mods[self._modulation]

-

- rot = 1

- if self._modulation == "qpsk":

- rot = (0.707+0.707j)

-

- if(self._modulation.find("psk") >= 0):

- rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity])

- elif(self._modulation.find("qam") >= 0):

- rotated_const = map(lambda pt: pt * rot, qam.constellation[arity])

- #print rotated_const

- self._pkt_input = gr.ofdm_mapper_bcv(rotated_const, msgq_limit,

- options.occupied_tones, options.fft_length)

-

- 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))

-

- self.connect((self._pkt_input, 0), (self.preambles, 0))

- self.connect((self._pkt_input, 1), (self.preambles, 1))

- self.connect(self.preambles, self.ifft, self.cp_adder, self.scale, self)

-

- if options.verbose:

- self._print_verbage()

-

- if options.log:

- self.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,

- "ofdm_mapper_c.dat"))

- self.connect(self.preambles, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,

- "ofdm_preambles.dat"))

- self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,

- "ofdm_ifft_c.dat"))

- self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex,

- "ofdm_cp_adder_c.dat"))

-

- 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, whitening=True)

-

- #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, qpsk, 8psk, qam{16,64}) [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_block2):

- """

- 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, 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 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

- """

- gr.hier_block2.__init__(self, "ofdm_demod",

- gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature

- gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature

-

-

- 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

- 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,)

-

- symbol_length = self._fft_length + self._cp_length

- self.ofdm_recv = ofdm_receiver(self._fft_length, self._cp_length,

- self._occupied_tones, self._snr, preambles,

- options.log)

-

- mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}

- arity = mods[self._modulation]

-

- rot = 1

- if self._modulation == "qpsk":

- rot = (0.707+0.707j)

-

- if(self._modulation.find("psk") >= 0):

- rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity])

- elif(self._modulation.find("qam") >= 0):

- rotated_const = map(lambda pt: pt * rot, qam.constellation[arity])

- #print rotated_const

-

- phgain = 0.25

- frgain = phgain*phgain / 4.0

- self.ofdm_demod = gr.ofdm_frame_sink(rotated_const, range(arity),

- self._rcvd_pktq,

- self._occupied_tones,

- phgain, frgain)

-

- self.connect(self, self.ofdm_recv)

- self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))

- self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))

-

- # added output signature to work around bug, though it might not be a bad

- # thing to export, anyway

- self.connect(self.ofdm_recv.chan_filt, self)

-

- if options.log:

- self.connect(self.ofdm_demod, gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones, "ofdm_frame_sink_c.dat"))

- else:

- self.connect(self.ofdm_demod, gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))

-

- if options.verbose:

- self._print_verbage()

-

- 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_4512_3 = [-1, -1, 1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 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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