Created standalone GSM channelizer app for splitting wideband captures into multiple
per-channel files
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#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# @file
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# @author Pieter Robyns <pieter.robyns@uhasselt.be>
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# @section LICENSE
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#
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# Gr-gsm is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# Gr-gsm is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gr-gsm; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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#
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##################################################
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# gr-gsm channelizer
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#
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# Standalone application to channelize a wideband
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# GSM capture file into multiple seperate capture
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# files for the specified ARFCNs.
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##################################################
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from gnuradio import blocks
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from gnuradio import eng_notation
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from gnuradio import filter
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from gnuradio import gr
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from gnuradio.eng_option import eng_option
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from gnuradio.filter import firdes
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from argparse import ArgumentParser, ArgumentTypeError, RawDescriptionHelpFormatter
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import grgsm.arfcn as arfcn
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import os
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EXTRA_HELP = """
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Example usage:
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gsm_channelize.py -f my_wideband_capture.cfile -c 925.2e6 990 991 992 993 994 995 1019 1020 1021 1022 1023
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The above example will channelize my_wideband_capture.cfile, in this case a cfile captured at
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925.2 MHz centered (ARFCN 975) and 20 Msps. As a result, 12 files will be generated for
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ARFCNs 975 - 1023 at 1 Msps each.
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"""
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def eng_float(value):
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try:
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return eng_notation.str_to_num(value)
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except:
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raise ArgumentTypeError("invalid engineering notation value: {0}".format(value))
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def gsm_band(value):
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choices = arfcn.get_bands()
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if value in choices:
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return value
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else:
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raise ArgumentTypeError("invalid GSM band: {0}. Possible choices are: {1}".format(value, choices))
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class gsm_channelize(gr.top_block):
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def __init__(self, channels, decim, ch_width, ch_twidth, fc, band, samp_rate, path):
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gr.top_block.__init__(self, "gsm_channelize")
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##################################################
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# Parameters
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##################################################
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self.channels = channels
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self.decim = decim
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self.ch_width = ch_width
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self.ch_twidth = ch_twidth
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self.fc = fc
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self.band = band
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self.samp_rate = samp_rate
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self.blocks_fir_filters = {}
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self.blocks_file_sinks = {}
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##################################################
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# Blocks and connections
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##################################################
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self.blocks_file_source = blocks.file_source(gr.sizeof_gr_complex, path, False)
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self.blocks_throttle = blocks.throttle(gr.sizeof_gr_complex, samp_rate,True)
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self.connect((self.blocks_file_source, 0), (self.blocks_throttle, 0))
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c0_arfcn = arfcn.downlink2arfcn(fc, band)
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self.channels.insert(0, c0_arfcn)
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print("Extracting channels %s, given that the center frequency is at ARFCN %d (%s)" % (str(channels), c0_arfcn, eng_notation.num_to_str(fc)))
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for channel in channels:
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channel_freq = arfcn.arfcn2downlink(channel, band)
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if channel_freq is None:
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print("Warning: invalid ARFCN %d for band %s" % (channel, band))
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continue
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freq_diff = channel_freq - fc
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print("ARFCN %d is at C0 %+d KHz" % (channel, int(freq_diff / 1000.0)))
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self.blocks_fir_filters[channel] = filter.freq_xlating_fir_filter_ccc(decim, (firdes.low_pass(1, samp_rate, ch_width, ch_twidth)), freq_diff, samp_rate)
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self.connect((self.blocks_throttle, 0), (self.blocks_fir_filters[channel], 0))
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self.blocks_file_sinks[channel] = blocks.file_sink(gr.sizeof_gr_complex, "./gsm_channelizer/out_" + str(channel) + ".cfile", False)
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self.blocks_file_sinks[channel].set_unbuffered(False)
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self.connect((self.blocks_fir_filters[channel], 0), (self.blocks_file_sinks[channel], 0))
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if __name__ == '__main__':
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parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter, description='Split wideband a GSM capture into seperate files per ARFCN.', epilog=EXTRA_HELP)
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parser.add_argument(dest="channel", type=int, nargs='+',
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help="List of ARFCNs")
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parser.add_argument("-w", "--width", dest="width", type=eng_float, default=eng_notation.num_to_str(200000),
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help="Channel lowpass width [default=%(default)s]")
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parser.add_argument("-t", "--transition-width", dest="twidth", type=eng_float, default=eng_notation.num_to_str(50000),
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help="Channel lowpass transition width [default=%(default)s]")
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parser.add_argument("-s", "--samp-rate", dest="samp_rate", type=eng_float, default=eng_notation.num_to_str(2e7),
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help="Sample rate of the wideband capture file [default=%(default)s]")
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parser.add_argument("-o", "--out-samp-rate", dest="out_samp_rate", type=eng_float, default=eng_notation.num_to_str(1e6),
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help="Sample rate of the output capture files [default=%(default)s]")
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parser.add_argument("-b", "--band", dest="band", type=gsm_band, default='E-GSM',
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help="GSM band [default=%(default)s]")
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parser.add_argument("-f", "--cfile", dest="path", type=str, required=True,
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help="Path to wideband GSM capture file")
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parser.add_argument("-c", "--C0", dest="fc", type=eng_float, default=eng_notation.num_to_str(925.2e6), required=True,
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help="C0 (BCCH) channel frequency in Hz [default=%(default)s]")
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args = parser.parse_args()
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if not os.path.exists("./gsm_channelizer"):
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os.makedirs("./gsm_channelizer")
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if not os.path.exists(args.path):
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raise IOError(args.path + " does not exist")
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if args.samp_rate % args.out_samp_rate != 0:
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raise Exception("Input sample rate should be multiple of output sample rate in order to get integer decimation.")
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decim = int(args.samp_rate / args.out_samp_rate)
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print("Input sample rate: " + eng_notation.num_to_str(args.samp_rate))
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print("Output sample rate: " + eng_notation.num_to_str(args.out_samp_rate))
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print("==> using decimation of " + str(decim))
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tb = gsm_channelize(channels=args.channel,
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decim=decim,
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ch_width=args.width,
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ch_twidth=args.twidth,
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fc=args.fc,
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band=args.band,
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samp_rate=args.samp_rate,
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path=args.path)
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tb.start()
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tb.wait()
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print("Done!")
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