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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*!\file nrLDPC_decoder.c
* \brief Defines the LDPC decoder
* \author Sebastian Wagner (TCL Communications) Email: <mailto:sebastian.wagner@tcl.com>
* \date 27-03-2018
* \version 1.0
* \note
* \warning
*/
#include <stdint.h>
#include <immintrin.h>
#include "nrLDPC_defs.h"
#include "nrLDPC_types.h"
#include "nrLDPC_init.h"
#include "nrLDPC_mPass.h"
#include "nrLDPC_cnProc.h"
#include "nrLDPC_bnProc.h"
#define NR_LDPC_ENABLE_PARITY_CHECK
Florian Kaltenberger
committed
//#define NR_LDPC_PROFILER_DETAIL
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#ifdef NR_LDPC_DEBUG_MODE
#include "nrLDPC_tools/nrLDPC_debug.h"
#endif
static inline uint32_t nrLDPC_decoder_core(int8_t* p_llr, int8_t* p_out, uint32_t numLLR, t_nrLDPC_lut* p_lut, t_nrLDPC_dec_params* p_decParams, t_nrLDPC_time_stats* p_profiler);
int32_t nrLDPC_decoder(t_nrLDPC_dec_params* p_decParams, int8_t* p_llr, int8_t* p_out, t_nrLDPC_time_stats* p_profiler)
{
uint32_t numLLR;
uint32_t numIter = 0;
t_nrLDPC_lut lut;
t_nrLDPC_lut* p_lut = &lut;
// Initialize decoder core(s) with correct LUTs
numLLR = nrLDPC_init(p_decParams, p_lut);
// Launch LDPC decoder core for one segment
numIter = nrLDPC_decoder_core(p_llr, p_out, numLLR, p_lut, p_decParams, p_profiler);
return numIter;
}
/**
\brief Performs LDPC decoding of one code block
\param p_llr Input LLRs
\param p_out Output vector
\param numLLR Number of LLRs
\param p_lut Pointer to decoder LUTs
\param p_decParams LDPC decoder parameters
\param p_profiler LDPC profiler statistics
*/
static inline uint32_t nrLDPC_decoder_core(int8_t* p_llr, int8_t* p_out, uint32_t numLLR, t_nrLDPC_lut* p_lut, t_nrLDPC_dec_params* p_decParams, t_nrLDPC_time_stats* p_profiler)
{
uint16_t Z = p_decParams->Z;
uint8_t BG = p_decParams->BG;
uint8_t numMaxIter = p_decParams->numMaxIter;
e_nrLDPC_outMode outMode = p_decParams->outMode;
// Minimum number of iterations is 1
// 0 iterations means hard-decision on input LLRs
uint32_t i = 1;
// Initialize with parity check fail != 0
int32_t pcRes = 1;
int8_t* p_llrOut;
if (outMode == nrLDPC_outMode_LLRINT8)
{
p_llrOut = p_out;
}
else
{
// Use LLR processing buffer as temporary output buffer
p_llrOut = (int8_t*) llrProcBuf;
}
// Initialization
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->llr2llrProcBuf);
#endif
nrLDPC_llr2llrProcBuf(p_lut, p_llr, Z, BG);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->llr2llrProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_initBuffer2File(nrLDPC_buffers_LLR_PROC);
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_LLR_PROC);
#endif
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->llr2CnProcBuf);
#endif
nrLDPC_llr2CnProcBuf(p_lut, p_llr, numLLR, Z, BG);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->llr2CnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_initBuffer2File(nrLDPC_buffers_CN_PROC);
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC);
#endif
// First iteration
// CN processing
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cnProc);
#endif
if (BG == 1)
{
nrLDPC_cnProc_BG1(p_lut, Z);
}
else
{
nrLDPC_cnProc_BG2(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cnProc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_initBuffer2File(nrLDPC_buffers_CN_PROC_RES);
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC_RES);
#endif
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cn2bnProcBuf);
#endif
if (BG == 1)
{
nrLDPC_cn2bnProcBuf_BG1(p_lut, Z);
}
else
{
nrLDPC_cn2bnProcBuf(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cn2bnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_initBuffer2File(nrLDPC_buffers_BN_PROC);
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_BN_PROC);
#endif
// BN processing
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProcPc);
#endif
nrLDPC_bnProcPc(p_lut, Z);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bnProcPc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_initBuffer2File(nrLDPC_buffers_LLR_RES);
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_LLR_RES);
#endif
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProc);
#endif
nrLDPC_bnProc(p_lut, Z);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bnProc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_initBuffer2File(nrLDPC_buffers_BN_PROC_RES);
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_BN_PROC_RES);
#endif
// BN results to CN processing buffer
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bn2cnProcBuf);
#endif
if (BG == 1)
{
nrLDPC_bn2cnProcBuf_BG1(p_lut, Z);
}
else
{
nrLDPC_bn2cnProcBuf(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bn2cnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC);
#endif
// Parity Check not necessary here since it will fail
// because first 2 cols/BNs in BG are punctured and cannot be
// estimated after only one iteration
// First iteration finished
while ( (i < (numMaxIter-1)) && (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, Z);
}
else
{
nrLDPC_cnProc_BG2(p_lut, 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);
#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, Z);
}
else
{
nrLDPC_cn2bnProcBuf(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cn2bnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_BN_PROC);
#endif
// BN Processing
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProcPc);
#endif
nrLDPC_bnProcPc(p_lut, Z);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bnProcPc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_LLR_RES);
#endif
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProc);
#endif
nrLDPC_bnProc(p_lut, 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);
#endif
// BN results to CN processing buffer
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bn2cnProcBuf);
#endif
if (BG == 1)
{
nrLDPC_bn2cnProcBuf_BG1(p_lut, Z);
}
else
{
nrLDPC_bn2cnProcBuf(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bn2cnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC);
#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, Z);
}
else
{
pcRes = nrLDPC_cnProcPc_BG2(p_lut, 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, Z);
}
else
{
nrLDPC_cnProc_BG2(p_lut, 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);
#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, Z);
}
else
{
nrLDPC_cn2bnProcBuf(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cn2bnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_BN_PROC);
#endif
// BN Processing
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProcPc);
#endif
nrLDPC_bnProcPc(p_lut, Z);
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bnProcPc);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_LLR_RES);
#endif
// If parity check not enabled, no need to send the BN proc results
// back to CNs
#ifdef NR_LDPC_ENABLE_PARITY_CHECK
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bnProc);
#endif
nrLDPC_bnProc(p_lut, 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);
#endif
// BN results to CN processing buffer
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->bn2cnProcBuf);
#endif
if (BG == 1)
{
nrLDPC_bn2cnProcBuf_BG1(p_lut, Z);
}
else
{
nrLDPC_bn2cnProcBuf(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->bn2cnProcBuf);
#endif
#ifdef NR_LDPC_DEBUG_MODE
nrLDPC_debug_writeBuffer2File(nrLDPC_buffers_CN_PROC);
#endif
// Parity Check
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->cnProcPc);
#endif
if (BG == 1)
{
pcRes = nrLDPC_cnProcPc_BG1(p_lut, Z);
}
else
{
pcRes = nrLDPC_cnProcPc_BG2(p_lut, Z);
}
#ifdef NR_LDPC_PROFILER_DETAIL
stop_meas(&p_profiler->cnProcPc);
#endif
#endif
}
// If maximum number of iterations reached an PC still fails increase number of iterations
// Thus, i > numMaxIter indicates that PC has failed
if (pcRes != 0)
{
i++;
}
// Assign results from processing buffer to output
#ifdef NR_LDPC_PROFILER_DETAIL
start_meas(&p_profiler->llrRes2llrOut);
#endif
nrLDPC_llrRes2llrOut(p_lut, p_llrOut, numLLR);
#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;
}