amateurfunk/hamnet70
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15 commits 3 branches 1 tag 1.7 MiB
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7 commits

Author SHA1 Message Date
Thomas Kolb c17c7e060f Integrate preamble search 2022-02-01 21:35:43 +01:00
Thomas Kolb b6713909f7 Make initial frequency sync much faster 
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
Thomas Kolb c1dd039d6b First shot at frequency synchronization 
Supports only the BPSK part so far (ramp-up, preamble).
 2022-01-30 20:05:20 +01:00
Thomas Kolb 09465591ed Added symsync to the receiver chain 2022-01-29 22:37:55 +01:00
Thomas Kolb d522a1d6bd Implemented pulse shaping 
The pulse shaper currently uses an RRC filter with beta=0.2.
 2022-01-29 22:05:17 +01:00
Thomas Kolb 874d8d5073 Fixed the modulator + test demodulation 2021-10-17 19:45:54 +02:00
Thomas Kolb 9ba470adeb Initial implementation of packet modulation 
Not really tested yet…
 2021-10-17 19:26:38 +02:00