maki/openairinterface5g
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix(nrLDPC_decoder): Cleaning LDPC iteration accounting in NR

Browse Source 
The idea is to make LDPC iteration accounting more standard from a C coding perspective by making two changes:
1. Now the iteration counter starts at 0 for the first iteration and goes up to max_ldpc_iterations - 1 for the last iteration.
   If it is equal to max_ldpc_iterations, it means that decoding failed.
2. A chain of useless returns in the UE DLSCH decoding call chain was removed.
This commit is contained in:
Romain Beurdouche
2025-03-10 15:11:19 +00:00
parent b6bedf1216
commit 6b660e4091
12 changed files with 52 additions and 58 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair1/PHY/CODING/nrLDPC_coding/nrLDPC_coding_segment/nrLDPC_coding_segment_decoder.c
+1 -1
View File
@@ -218,7 +218,7 @@ static void nr_process_decode_segment(void *arg)
int decodeIterations =
LDPCdecoder(p_decoderParms, 0, 0, 0, l, llrProcBuf, p_procTime, rdata->abort_decode);
if (decodeIterations <= p_decoderParms->numMaxIter) {
if (decodeIterations < p_decoderParms->numMaxIter) {
memcpy(rdata->c, llrProcBuf, K >> 3);
*rdata->decodeSuccess = true;
} else {
openair1/PHY/CODING/nrLDPC_coding/nrLDPC_coding_xdma/nrLDPC_coding_xdma.c
+5 -5
View File
@@ -277,8 +277,8 @@ int decoder_xdma(nrLDPC_TB_decoding_parameters_t *TB_params, int frame_rx, int s
for (uint32_t job = 0; job < num_threads_prepare; job++) {
args_fpga_decode_prepare_t *args = &arr[job];
if (args->no_iteration_ldpc > TB_params->max_ldpc_iterations)
no_iteration_ldpc = TB_params->max_ldpc_iterations + 1;
if (args->no_iteration_ldpc >= TB_params->max_ldpc_iterations)
no_iteration_ldpc = TB_params->max_ldpc_iterations;
}
// launch decode with FPGA
@@ -306,12 +306,12 @@ int decoder_xdma(nrLDPC_TB_decoding_parameters_t *TB_params, int frame_rx, int s
#ifdef DEBUG_CRC
LOG_I(PHY, "segment %d CRC NOK\n", r);
#endif
no_iteration_ldpc = TB_params->max_ldpc_iterations + 1;
no_iteration_ldpc = TB_params->max_ldpc_iterations;
}
for (int i = 0; i < out_CBoffset; i++) {
segment_params->c[i] = multi_outdata[i + r * out_CBoffset];
}
segment_params->decodeSuccess = (no_iteration_ldpc <= TB_params->max_ldpc_iterations);
segment_params->decodeSuccess = (no_iteration_ldpc < TB_params->max_ldpc_iterations);
if (segment_params->decodeSuccess) {
*TB_params->processedSegments = *TB_params->processedSegments + 1;
}
@@ -396,7 +396,7 @@ void nr_ulsch_FPGA_decoding_prepare_blocks(void *args)
== -1) {
stop_meas(&segment_params->ts_rate_unmatch);
LOG_E(PHY, "ulsch_decoding.c: Problem in rate_matching\n");
no_iteration_ldpc = max_ldpc_iterations + 1;
no_iteration_ldpc = max_ldpc_iterations;
arguments->no_iteration_ldpc = no_iteration_ldpc;
return;
} else {