rpp | 29a39b2 | 2015-09-11 16:33:58 +0200 | [diff] [blame] | 1 | #!/usr/bin/env python2 |
| 2 | # -*- coding: utf-8 -*- |
| 3 | # @file |
| 4 | # @author Pieter Robyns <pieter.robyns@uhasselt.be> |
| 5 | # @section LICENSE |
| 6 | # |
| 7 | # Gr-gsm is free software; you can redistribute it and/or modify |
| 8 | # it under the terms of the GNU General Public License as published by |
| 9 | # the Free Software Foundation; either version 3, or (at your option) |
| 10 | # any later version. |
| 11 | # |
| 12 | # Gr-gsm is distributed in the hope that it will be useful, |
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | # GNU General Public License for more details. |
| 16 | # |
| 17 | # You should have received a copy of the GNU General Public License |
| 18 | # along with gr-gsm; see the file COPYING. If not, write to |
| 19 | # the Free Software Foundation, Inc., 51 Franklin Street, |
| 20 | # Boston, MA 02110-1301, USA. |
| 21 | # |
| 22 | # |
| 23 | |
| 24 | ################################################## |
| 25 | # gr-gsm channelizer |
| 26 | # |
| 27 | # Standalone application to channelize a wideband |
| 28 | # GSM capture file into multiple seperate capture |
| 29 | # files for the specified ARFCNs. |
| 30 | ################################################## |
| 31 | |
| 32 | from gnuradio import blocks |
| 33 | from gnuradio import eng_notation |
| 34 | from gnuradio import filter |
| 35 | from gnuradio import gr |
| 36 | from gnuradio.eng_option import eng_option |
| 37 | from gnuradio.filter import firdes |
| 38 | from argparse import ArgumentParser, ArgumentTypeError, RawDescriptionHelpFormatter |
| 39 | import grgsm.arfcn as arfcn |
| 40 | import os |
| 41 | |
| 42 | EXTRA_HELP = """ |
| 43 | Example usage: |
| 44 | gsm_channelize.py -f my_wideband_capture.cfile -c 925.2e6 990 991 992 993 994 995 1019 1020 1021 1022 1023 |
| 45 | |
| 46 | The above example will channelize my_wideband_capture.cfile, in this case a cfile captured at |
| 47 | 925.2 MHz centered (ARFCN 975) and 20 Msps. As a result, 12 files will be generated for |
| 48 | ARFCNs 975 - 1023 at 1 Msps each. |
| 49 | """ |
| 50 | |
| 51 | def eng_float(value): |
| 52 | try: |
| 53 | return eng_notation.str_to_num(value) |
| 54 | except: |
| 55 | raise ArgumentTypeError("invalid engineering notation value: {0}".format(value)) |
| 56 | |
| 57 | def gsm_band(value): |
| 58 | choices = arfcn.get_bands() |
| 59 | if value in choices: |
| 60 | return value |
| 61 | else: |
| 62 | raise ArgumentTypeError("invalid GSM band: {0}. Possible choices are: {1}".format(value, choices)) |
| 63 | |
| 64 | class gsm_channelize(gr.top_block): |
| 65 | def __init__(self, channels, decim, ch_width, ch_twidth, fc, band, samp_rate, path): |
| 66 | gr.top_block.__init__(self, "gsm_channelize") |
| 67 | |
| 68 | ################################################## |
| 69 | # Parameters |
| 70 | ################################################## |
| 71 | self.channels = channels |
| 72 | self.decim = decim |
| 73 | self.ch_width = ch_width |
| 74 | self.ch_twidth = ch_twidth |
| 75 | self.fc = fc |
| 76 | self.band = band |
| 77 | self.samp_rate = samp_rate |
| 78 | self.blocks_fir_filters = {} |
| 79 | self.blocks_file_sinks = {} |
| 80 | |
| 81 | ################################################## |
| 82 | # Blocks and connections |
| 83 | ################################################## |
| 84 | self.blocks_file_source = blocks.file_source(gr.sizeof_gr_complex, path, False) |
rpp | 29a39b2 | 2015-09-11 16:33:58 +0200 | [diff] [blame] | 85 | |
| 86 | c0_arfcn = arfcn.downlink2arfcn(fc, band) |
| 87 | self.channels.insert(0, c0_arfcn) |
| 88 | print("Extracting channels %s, given that the center frequency is at ARFCN %d (%s)" % (str(channels), c0_arfcn, eng_notation.num_to_str(fc))) |
| 89 | |
| 90 | for channel in channels: |
| 91 | channel_freq = arfcn.arfcn2downlink(channel, band) |
| 92 | if channel_freq is None: |
| 93 | print("Warning: invalid ARFCN %d for band %s" % (channel, band)) |
| 94 | continue |
| 95 | freq_diff = channel_freq - fc |
| 96 | print("ARFCN %d is at C0 %+d KHz" % (channel, int(freq_diff / 1000.0))) |
| 97 | |
| 98 | 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) |
Steve Glass | e25e10e | 2015-11-13 18:29:07 +1000 | [diff] [blame] | 99 | self.connect((self.blocks_file_source, 0), (self.blocks_fir_filters[channel], 0)) |
rpp | 29a39b2 | 2015-09-11 16:33:58 +0200 | [diff] [blame] | 100 | |
| 101 | self.blocks_file_sinks[channel] = blocks.file_sink(gr.sizeof_gr_complex, "./gsm_channelizer/out_" + str(channel) + ".cfile", False) |
| 102 | self.blocks_file_sinks[channel].set_unbuffered(False) |
| 103 | self.connect((self.blocks_fir_filters[channel], 0), (self.blocks_file_sinks[channel], 0)) |
| 104 | |
| 105 | |
| 106 | if __name__ == '__main__': |
| 107 | parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter, description='Split wideband a GSM capture into seperate files per ARFCN.', epilog=EXTRA_HELP) |
| 108 | parser.add_argument(dest="channel", type=int, nargs='+', |
| 109 | help="List of ARFCNs") |
| 110 | parser.add_argument("-w", "--width", dest="width", type=eng_float, default=eng_notation.num_to_str(200000), |
| 111 | help="Channel lowpass width [default=%(default)s]") |
| 112 | parser.add_argument("-t", "--transition-width", dest="twidth", type=eng_float, default=eng_notation.num_to_str(50000), |
| 113 | help="Channel lowpass transition width [default=%(default)s]") |
| 114 | parser.add_argument("-s", "--samp-rate", dest="samp_rate", type=eng_float, default=eng_notation.num_to_str(2e7), |
| 115 | help="Sample rate of the wideband capture file [default=%(default)s]") |
| 116 | parser.add_argument("-o", "--out-samp-rate", dest="out_samp_rate", type=eng_float, default=eng_notation.num_to_str(1e6), |
| 117 | help="Sample rate of the output capture files [default=%(default)s]") |
| 118 | parser.add_argument("-b", "--band", dest="band", type=gsm_band, default='E-GSM', |
| 119 | help="GSM band [default=%(default)s]") |
| 120 | parser.add_argument("-f", "--cfile", dest="path", type=str, required=True, |
| 121 | help="Path to wideband GSM capture file") |
| 122 | parser.add_argument("-c", "--C0", dest="fc", type=eng_float, default=eng_notation.num_to_str(925.2e6), required=True, |
| 123 | help="C0 (BCCH) channel frequency in Hz [default=%(default)s]") |
| 124 | args = parser.parse_args() |
| 125 | |
| 126 | if not os.path.exists("./gsm_channelizer"): |
| 127 | os.makedirs("./gsm_channelizer") |
| 128 | |
| 129 | if not os.path.exists(args.path): |
| 130 | raise IOError(args.path + " does not exist") |
| 131 | |
| 132 | if args.samp_rate % args.out_samp_rate != 0: |
| 133 | raise Exception("Input sample rate should be multiple of output sample rate in order to get integer decimation.") |
| 134 | |
| 135 | decim = int(args.samp_rate / args.out_samp_rate) |
| 136 | print("Input sample rate: " + eng_notation.num_to_str(args.samp_rate)) |
| 137 | print("Output sample rate: " + eng_notation.num_to_str(args.out_samp_rate)) |
| 138 | print("==> using decimation of " + str(decim)) |
| 139 | |
| 140 | tb = gsm_channelize(channels=args.channel, |
| 141 | decim=decim, |
| 142 | ch_width=args.width, |
| 143 | ch_twidth=args.twidth, |
| 144 | fc=args.fc, |
| 145 | band=args.band, |
| 146 | samp_rate=args.samp_rate, |
| 147 | path=args.path) |
| 148 | tb.start() |
| 149 | tb.wait() |
| 150 | print("Done!") |