b6713909f7
Make initial frequency sync much faster
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The NCO frequency is now only adjusted every 8 symbols. That means that
the frequency error over the last 8 symbols before the adjustment is
(almost) constant, giving a good estimation result. Therefore, the
adjustment factor can be much larger than previously, leading to faster
acquisition time.
2022-01-30 20:23:41 +01:00
c1dd039d6b
First shot at frequency synchronization
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Supports only the BPSK part so far (ramp-up, preamble).
2022-01-30 20:05:20 +01:00
09465591ed
Added symsync to the receiver chain
2022-01-29 22:37:55 +01:00
f983635c14
Fixed output size of transmission_filter_packet()
2022-01-29 22:14:25 +01:00
d522a1d6bd
Implemented pulse shaping
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The pulse shaper currently uses an RRC filter with beta=0.2.
2022-01-29 22:05:17 +01:00
a6fed80149
Added script for plotting the spectrum of signal dumps
2022-01-29 22:03:51 +01:00
Thomas Kolb
a1f62a3b0a
packet_mod: implement FEC and modulation for the header
2022-01-23 16:28:53 +01:00
Thomas Kolb
9a1107ff38
Added correlator + small test program
2022-01-22 22:42:05 +01:00
6c21618f1f
Document the packet_mod interface
2021-10-17 22:51:10 +02:00
Thomas Kolb
62ff2938ac
Some python debug plot scripts
2021-10-17 19:46:30 +02:00
Thomas Kolb
874d8d5073
Fixed the modulator + test demodulation
2021-10-17 19:45:54 +02:00
Thomas Kolb
9ba470adeb
Initial implementation of packet modulation
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Not really tested yet…
2021-10-17 19:26:38 +02:00
Thomas Kolb
0b237a47cb
Initial commit: infrastructure
2021-10-17 19:25:42 +02:00
Thomas Kolb
Thomas Kolb