From 09465591ed02478fd378e0eec217beb1163217e6 Mon Sep 17 00:00:00 2001 From: Thomas Kolb Date: Sat, 29 Jan 2022 22:36:41 +0100 Subject: [PATCH] Added symsync to the receiver chain --- impl/src/main.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/impl/src/main.c b/impl/src/main.c index 0209524..ac1e4c2 100644 --- a/impl/src/main.c +++ b/impl/src/main.c @@ -21,10 +21,9 @@ int main(void) float snr = 20.0f; channel_cccf_add_awgn(channel, -snr, snr); + channel_cccf_add_carrier_offset(channel, 0.01f, 1.00f); - unsigned int k = fec_get_enc_msg_length(CHANNEL_CODE, sizeof(msg_org)); - packet_mod_ctx_t pmod; packet_mod_init(&pmod); @@ -70,17 +69,23 @@ int main(void) dump_array_cf(whole_burst, burst_len, 1.0f, "/tmp/tx.cpx"); -#if 0 // channel - float complex msg_received[nsyms]; + float complex msg_received[burst_len]; - nsyms = nsyms - 63 - 16; + //memcpy(msg_received, whole_burst, sizeof(whole_burst)); // no noise in channel - //memcpy(msg_received, msg_mod, sizeof(msg_received)); // no noise in channel + channel_cccf_execute_block(channel, whole_burst, burst_len, msg_received); + dump_array_cf(msg_received, burst_len, 1.0f, "/tmp/rx.cpx"); - channel_cccf_execute_block(channel, msg_mod + 63 + 16, nsyms, msg_received); - dump_array_cf(msg_received, nsyms, 1.0f, "/tmp/rx.cpx"); + // create symbol synchronizer + symsync_crcf symsync = symsync_crcf_create_rnyquist(LIQUID_FIRFILT_RRC, RRC_SPS, RRC_DELAY, RRC_BETA, 32); + float complex symsync_out[burst_len]; + unsigned int symsync_out_len; + symsync_crcf_execute(symsync, msg_received, burst_len, symsync_out, &symsync_out_len); + dump_array_cf(symsync_out, symsync_out_len, 1.0f, "/tmp/rx.cpx"); + +#if 0 // demodulate unsigned int bps = modem_get_bps(demod);