kopia lustrzana https://github.com/projecthorus/wenet
Add baud rate error notes
Mark Jessop
rodzic
d993f60981
commit
6671bd1505
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@ -89,3 +89,84 @@ Currently there are demod chain tests for:
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* `wenet_rs232_demod` - Wenet 'traditional' (v1?), 115177 baud, RS232 framing, with complex u8 samples going into fsk_demod
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* `wenet_rs232_demod_c16` - Same as above, but feeding complex signed-16-bit samoples into fsk_demod (should give the same results).
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## Baud Rate Error
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If we compile the `tsrc` [resampling utility](https://github.com/projecthorus/radiosonde_auto_rx/blob/master/utils/tsrc.c) from radiosonde_auto_rx and place that in the working directory, we can also investigate how baud rate error effects the modem. We emulate baud rate error by resampling the test samples before feeding them into the demodulator. The --resample argument to test_demod.py allows this.
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The short version of the results below is that at 0.3% baud rate error, the demodulator is barely affected. At 0.4 to 0.5% we start to see some significant degradation in performance. At 0.6% error the demodulator falls over completely.
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Some detailed results below:
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0.3% baud rate error (resampling 1.003)
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```
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wenet_sample_fs921416_float_05.0dB.bin, 0, 11.616
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wenet_sample_fs921416_float_05.5dB.bin, 0, 11.082
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wenet_sample_fs921416_float_06.0dB.bin, 0, 10.958
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wenet_sample_fs921416_float_06.5dB.bin, 0, 11.502
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wenet_sample_fs921416_float_07.0dB.bin, 0, 11.689
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wenet_sample_fs921416_float_07.5dB.bin, 512, 10.945
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wenet_sample_fs921416_float_08.0dB.bin, 44288, 12.450
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wenet_sample_fs921416_float_08.5dB.bin, 319744, 10.885
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wenet_sample_fs921416_float_09.0dB.bin, 498176, 12.270
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wenet_sample_fs921416_float_09.5dB.bin, 517888, 11.823
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wenet_sample_fs921416_float_10.0dB.bin, 524800, 11.473
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wenet_sample_fs921416_float_10.5dB.bin, 527872, 12.089
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wenet_sample_fs921416_float_11.0dB.bin, 527616, 10.763
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wenet_sample_fs921416_float_11.5dB.bin, 529408, 10.672
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wenet_sample_fs921416_float_12.0dB.bin, 528640, 10.982
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wenet_sample_fs921416_float_12.5dB.bin, 529920, 10.786
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wenet_sample_fs921416_float_13.0dB.bin, 530432, 11.128
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wenet_sample_fs921416_float_13.5dB.bin, 530432, 11.618
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wenet_sample_fs921416_float_14.0dB.bin, 530688, 13.131
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wenet_sample_fs921416_float_14.5dB.bin, 530176, 11.227
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```
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0.4% baud rate error (resampling 1.004)
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```
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wenet_sample_fs921416_float_05.0dB.bin, 0, 14.871
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wenet_sample_fs921416_float_05.5dB.bin, 0, 12.558
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wenet_sample_fs921416_float_06.0dB.bin, 0, 11.828
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wenet_sample_fs921416_float_06.5dB.bin, 0, 11.590
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wenet_sample_fs921416_float_07.0dB.bin, 0, 11.789
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wenet_sample_fs921416_float_07.5dB.bin, 768, 39.762
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wenet_sample_fs921416_float_08.0dB.bin, 33024, 11.199
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wenet_sample_fs921416_float_08.5dB.bin, 233472, 11.640
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wenet_sample_fs921416_float_09.0dB.bin, 383744, 11.952
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wenet_sample_fs921416_float_09.5dB.bin, 423424, 11.615
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wenet_sample_fs921416_float_10.0dB.bin, 443392, 13.541
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wenet_sample_fs921416_float_10.5dB.bin, 464640, 11.773
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wenet_sample_fs921416_float_11.0dB.bin, 473600, 14.853
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wenet_sample_fs921416_float_11.5dB.bin, 489728, 12.342
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wenet_sample_fs921416_float_12.0dB.bin, 492800, 11.302
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wenet_sample_fs921416_float_12.5dB.bin, 509184, 14.049
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wenet_sample_fs921416_float_13.0dB.bin, 514816, 10.986
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wenet_sample_fs921416_float_13.5dB.bin, 516864, 11.716
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wenet_sample_fs921416_float_14.0dB.bin, 521216, 11.401
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wenet_sample_fs921416_float_14.5dB.bin, 526592, 11.116
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```
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0.5% baud rate error (resampling 1.005)
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```
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wenet_sample_fs921416_float_05.0dB.bin, 0, 11.811
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wenet_sample_fs921416_float_05.5dB.bin, 0, 12.631
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wenet_sample_fs921416_float_06.0dB.bin, 0, 19.314
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wenet_sample_fs921416_float_06.5dB.bin, 0, 23.884
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wenet_sample_fs921416_float_07.0dB.bin, 0, 17.919
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wenet_sample_fs921416_float_07.5dB.bin, 256, 24.970
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wenet_sample_fs921416_float_08.0dB.bin, 5120, 13.781
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wenet_sample_fs921416_float_08.5dB.bin, 41472, 12.175
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wenet_sample_fs921416_float_09.0dB.bin, 70400, 23.371
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wenet_sample_fs921416_float_09.5dB.bin, 93952, 14.122
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wenet_sample_fs921416_float_10.0dB.bin, 105728, 12.069
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wenet_sample_fs921416_float_10.5dB.bin, 116992, 18.710
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wenet_sample_fs921416_float_11.0dB.bin, 141056, 13.651
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wenet_sample_fs921416_float_11.5dB.bin, 143616, 20.215
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wenet_sample_fs921416_float_12.0dB.bin, 169216, 13.285
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wenet_sample_fs921416_float_12.5dB.bin, 178944, 13.912
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wenet_sample_fs921416_float_13.0dB.bin, 198656, 15.465
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wenet_sample_fs921416_float_13.5dB.bin, 219392, 14.138
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wenet_sample_fs921416_float_14.0dB.bin, 228864, 22.024
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wenet_sample_fs921416_float_14.5dB.bin, 255744, 18.072
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```
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@ -37,7 +37,7 @@ processing_type = {
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},
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}
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def run_analysis(mode, file_mask=None, shift=0.0, verbose=False, log_output = None, dry_run = False, quick=False, show=False):
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def run_analysis(mode, file_mask=None, shift=0.0, resample=1.0, verbose=False, log_output = None, dry_run = False, quick=False, show=False):
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_mode = processing_type[mode]
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@ -64,6 +64,8 @@ def run_analysis(mode, file_mask=None, shift=0.0, verbose=False, log_output = No
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# Calculate the frequency offset to apply, if defined.
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_shiftcmd = "| csdr shift_addition_cc %.5f 2>/dev/null" % (shift/96000.0)
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_resamplecmd = f"| csdr convert_f_s16 | ./tsrc - - {resample:.5f} -c | csdr convert_s16_f "
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if log_output is not None:
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_log = open(log_output,'w')
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@ -77,6 +79,9 @@ def run_analysis(mode, file_mask=None, shift=0.0, verbose=False, log_output = No
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if shift != 0.0:
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_cmd += _shiftcmd
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if resample != 1.0:
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_cmd += _resamplecmd
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# Add on the rest of the demodulation and decoding commands.
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_cmd += _mode['demod'] + _mode['decode']
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@ -126,6 +131,7 @@ if __name__ == "__main__":
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parser.add_argument("-v", "--verbose", action='store_true', default=False, help="Show additional debug info.")
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parser.add_argument("-d", "--dry-run", action='store_true', default=False, help="Show additional debug info.")
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parser.add_argument("--shift", type=float, default=0.0, help="Shift the signal-under test by x Hz. Default is 0.")
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parser.add_argument("--resample", type=float, default=1.0, help="Resample. Default is 1 (no resampling).")
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parser.add_argument("--batch", action='store_true', default=False, help="Run all tests, write results to results directory.")
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parser.add_argument("--quick", action='store_true', default=False, help="Only process the last sample file in the list (usually the strongest). Useful for checking the demodulators are still working.")
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parser.add_argument("--show", action='store_true', default=False, help="Show the first few lines of output, instead of running the post-processing step.")
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@ -145,4 +151,4 @@ if __name__ == "__main__":
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_log_name = "./results/" + _mode + ".txt"
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run_analysis(_mode, file_mask=None, shift=args.shift, verbose=args.verbose, log_output=_log_name, dry_run=args.dry_run, quick=args.quick, show=args.show)
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else:
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run_analysis(args.mode, args.files, shift=args.shift, verbose=args.verbose, dry_run=args.dry_run, quick=args.quick, show=args.show)
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run_analysis(args.mode, args.files, shift=args.shift, resample=args.resample, verbose=args.verbose, dry_run=args.dry_run, quick=args.quick, show=args.show)
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