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Commit 144cb781 authored by Sakthivel Velumani's avatar Sakthivel Velumani
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Replacing CRC check in LDPC decoder 

using CRC check instead of parity check as criteria for early termination in LDPC decoder
parent 8b21ecc3
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Showing with 19 additions and 141 deletions
openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_decoder.c
View file @ 144cb781
......@@ -321,135 +321,33 @@ static inline uint32_t nrLDPC_decoder_core(int8_t* p_llr, int8_t* p_out, t_nrLDP
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC, p_procBuf);
#endif
// Parity Check
#ifdef NR_LDPC_ENABLE_PARITY_CHECK
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cnProcPc);
#endif
if (BG == 1)
{
pcRes = nrLDPC_cnProcPc_BG1(p_lut, p_procBuf, Z);
}
else
{
pcRes = nrLDPC_cnProcPc_BG2(p_lut, p_procBuf, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cnProcPc);
#endif
#endif
}
// Last iteration
if ( (i < numMaxIter) && (pcRes != 0) )
{
// Increase iteration counter
i++;
// CN processing
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cnProc);
#endif
if (BG == 1)
{
nrLDPC_cnProc_BG1(p_lut, p_procBuf, Z);
}
else
{
nrLDPC_cnProc_BG2(p_lut, p_procBuf, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cnProc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC_RES, p_procBuf);
#endif
// Send CN results back to BNs
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cn2bnProcBuf);
#endif
if (BG == 1)
{
nrLDPC_cn2bnProcBuf_BG1(p_lut, p_procBuf, Z);
}
else
{
nrLDPC_cn2bnProcBuf_BG2(p_lut, p_procBuf, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cn2bnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_BN_PROC, p_procBuf);
#endif
// BN Processing
// Assign results from processing buffer to output
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProcPc);
start_meas(&p_profiler->llrRes2llrOut);
#endif
nrLDPC_bnProcPc(p_lut, p_procBuf, Z);
nrLDPC_llrRes2llrOut(p_lut, p_llrOut, p_procBuf, Z, BG);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bnProcPc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_LLR_RES, p_procBuf);
stop_meas(&p_profiler->llrRes2llrOut);
#endif
// If parity check not enabled, no need to send the BN proc results
// back to CNs
#ifdef NR_LDPC_ENABLE_PARITY_CHECK
// Hard-decision
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProc);
start_meas(&p_profiler->llr2bit);
#endif
nrLDPC_bnProc(p_lut, p_procBuf, Z);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bnProc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_BN_PROC_RES, p_procBuf);
#endif
// BN results to CN processing buffer
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bn2cnProcBuf);
#endif
if (BG == 1)
if (outMode == nrLDPC_outMode_BIT)
{
nrLDPC_bn2cnProcBuf_BG1(p_lut, p_procBuf, Z);
nrLDPC_llr2bitPacked(p_out, p_llrOut, numLLR);
}
else
else if (outMode == nrLDPC_outMode_BITINT8)
{
nrLDPC_bn2cnProcBuf_BG2(p_lut, p_procBuf, Z);
nrLDPC_llr2bit(p_out, p_llrOut, numLLR);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bn2cnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC, p_procBuf);
#endif
// Parity Check
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cnProcPc);
#endif
if (BG == 1)
{
pcRes = nrLDPC_cnProcPc_BG1(p_lut, p_procBuf, Z);
}
else
{
pcRes = nrLDPC_cnProcPc_BG2(p_lut, p_procBuf, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cnProcPc);
#endif
stop_meas(&p_profiler->llr2bit);
#endif
if (check_crc((uint8_t*)p_out,p_decParams->n,p_decParams->F,p_decParams->crc_type))
pcRes = 0;
}
// If maximum number of iterations reached an PC still fails increase number of iterations
......@@ -462,31 +360,5 @@ static inline uint32_t nrLDPC_decoder_core(int8_t* p_llr, int8_t* p_out, t_nrLDP
}
#endif
// Assign results from processing buffer to output
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->llrRes2llrOut);
#endif
nrLDPC_llrRes2llrOut(p_lut, p_llrOut, p_procBuf, Z, BG);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->llrRes2llrOut);
#endif
// Hard-decision
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->llr2bit);
#endif
if (outMode == nrLDPC_outMode_BIT)
{
nrLDPC_llr2bitPacked(p_out, p_llrOut, numLLR);
}
else if (outMode == nrLDPC_outMode_BITINT8)
{
nrLDPC_llr2bit(p_out, p_llrOut, numLLR);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->llr2bit);
#endif
return i;
}
openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_types.h
View file @ 144cb781
......@@ -72,6 +72,9 @@ typedef struct nrLDPC_dec_params {
uint8_t numMaxIter; /**< Maximum number of iterations */
int block_length;
e_nrLDPC_outMode outMode; /**< Output format */
uint32_t n;
uint32_t F;
uint8_t crc_type;
} t_nrLDPC_dec_params;
/**
......
openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c
View file @ 144cb781
......@@ -421,6 +421,8 @@ void nr_processULSegment(void* arg) {
////////////////////////////////// pl =====> llrProcBuf //////////////////////////////////
p_decoderParms->n = length_dec;
p_decoderParms->crc_type = crc_type;
no_iteration_ldpc = nrLDPC_decoder(p_decoderParms,
(int8_t*)&pl[0],
llrProcBuf,
......@@ -608,6 +610,7 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
p_decParams->numMaxIter = ulsch->max_ldpc_iterations;
p_decParams->outMode= 0;
p_decParams->F = harq_process->F;
r_offset = 0;
......
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