project:sdr:fcl
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| project:sdr:fcl [2016/07/10 08:32] – [Usage] spectrum oversample jenda | project:sdr:fcl [2016/11/25 07:29] (current) – ↷ Links adapted because of a move operation ruza | ||
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| ====== FCL, a fast spectrum channelizer ====== | ====== FCL, a fast spectrum channelizer ====== | ||
| - | FCL splits wideband spectrum from your SDR into narrowband channels. This is useful for networks that have lots of transmitters side-by-side, | + | FCL splits wideband spectrum from your SDR into narrowband channels. This is useful for networks that have lots of transmitters side-by-side, |
| It supports everything you would expect from a decent channelizer: | It supports everything you would expect from a decent channelizer: | ||
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| We use a straightforward implementation that is cache- and vector-friendly and we have a sane pthreads scheduler. At least on our computers, FCL is 2 to 5 times faster than [[http:// | We use a straightforward implementation that is cache- and vector-friendly and we have a sane pthreads scheduler. At least on our computers, FCL is 2 to 5 times faster than [[http:// | ||
| + | |||
| + | You can find description of the mathematical principles of the channelizer in Chapter 2 of [[https:// | ||
| The following chart compares FCL with GnuRadio 3.7.10. FCL was tuned using the hints below on this page, GnuRadio was profiled using volk_profile. Frequency correction in FCL was disabled. | The following chart compares FCL with GnuRadio 3.7.10. FCL was tuned using the hints below on this page, GnuRadio was profiled using volk_profile. Frequency correction in FCL was disabled. | ||
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| ===== Downloads ===== | ===== Downloads ===== | ||
| - | http:// | + | https:// |
| ===== Usage ===== | ===== Usage ===== | ||
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| < | < | ||
| mkfifo / | mkfifo / | ||
| - | mkfifo /tmp/pipe | ||
| - | rtl_sdr -f 90e6 -s 2e6 -g 49 -p 44 - | ./fcl -n 20 -s 13 -f " | + | rtl_sdr -f 90e6 -s 2e6 -g 49 -p 44 - | ./fcl -n 20 -s 13 -f " |
| </ | </ | ||
| - | i.e. read data as uint8_t, channelize to 20 channels with 20/13 oversample, select channels 3 and 8 (they are interleaved in the output stream, use the GnuRadio Deinterleave block to get them), read frequency correction from /tmp/pipe, output to / | + | i.e. read data as uint8_t, channelize to 20 channels with 20/13 oversample, select channels 3 and 8 (they are interleaved in the output stream, use the GnuRadio Deinterleave block to get them), output to / |
| - | The tool listens on localhost: | + | The tool listens on localhost: |
| * setrot - set frequency correction in // | * setrot - set frequency correction in // | ||
| * getrot - print current frequency correction | * getrot - print current frequency correction | ||
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| * getpwr - print relative power of your channels. You can use this to e.g. detect BTSs | * getpwr - print relative power of your channels. You can use this to e.g. detect BTSs | ||
| * getpwn N - increase number of FFT bins N-times (i.e. get much more detailed view of the spectrum); 1 <= N <= 32 | * getpwn N - increase number of FFT bins N-times (i.e. get much more detailed view of the spectrum); 1 <= N <= 32 | ||
| + | * gethisto - print histogram (evenly spaced at [0, 1] absolute values of input floats) of samples | ||
| There is a convenient wrapper around gnuradio firdes called fir.py. | There is a convenient wrapper around gnuradio firdes called fir.py. | ||
project/sdr/fcl.1468139561.txt.gz · Last modified: 2016/07/10 08:32 by jenda