OK, in addition to my actual recordings,
that would be using :
https://github.com/drowe67/codec2/blob/master/src/cohpsk_ch.c
together with
https://github.com/drowe67/codec2/blob/master/octave/cohpsk_ch_fading.m
?
On 7/14/2020 5:23 PM, David Rowe wrote:
Hi Glen,
/* update mean amplitude estimate for LDPC decoder scaling */
ofdm->mean_amp = 0.9f * ofdm->mean_amp + 0.1f * sum_amp /
(ofdm->rowsperframe * ofdm->nc);
Yes, that's used for LDPC decoding so could be related.
It would also be useful to have a repeatable unit test to explore the
issue, e.g. a repeatable fading profile running with the command line
version of the modem.
Cheers,
David
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Glen English
RF Communications and Electronics Engineer
CORTEX RF
Pacific Media Technologies Pty Ltd trading as Cortex RF
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