added optimized polar decoding to UE DCI processing. Still to be tested....

added optimized polar decoding to UE DCI processing. Still to be tested. Changed decoder API to return XOR(CRC,rxCRC) which can be used to check for RNTI at receiver. For PBCH it returns 0 on positive CRC, !=0 on CRC mismatch.

openair1/PHY/CODING/TESTBENCH/polartest.c

@@ -32,7 +32,7 @@ int main(int argc, char *argv[]) {
 
 	double SNR, SNR_lin;
 	int16_t nBitError = 0; // -1 = Decoding failed (All list entries have failed the CRC checks).
-	int8_t decoderState=0, blockErrorState=0; //0 = Success, -1 = Decoding failed, 1 = Block Error.
+	uint32_t decoderState=0, blockErrorState=0; //0 = Success, -1 = Decoding failed, 1 = Block Error.
 	uint16_t testLength = 0, coderLength = 0, blockErrorCumulative=0, bitErrorCumulative=0;
 	double timeEncoderCumulative = 0, timeDecoderCumulative = 0;
 	uint8_t aggregation_level = 8, decoderListSize = 8, pathMetricAppr = 0;
@@ -385,7 +385,7 @@ int main(int argc, char *argv[]) {
 
 
 			//calculate errors
-			if (decoderState==-1) {
+			if (decoderState!=0) {
 				blockErrorState=-1;
 				nBitError=-1;
 			} else {

openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c

@@ -1070,9 +1070,9 @@ void init_polar_deinterleaver_table(t_nrPolar_params *polarParams) {
 
 }
 
-int8_t polar_decoder_int16(int16_t *input,
-			   uint64_t *out,
-			   t_nrPolar_params *polarParams)
+uint32_t polar_decoder_int16(int16_t *input,
+			     uint64_t *out,
+			     t_nrPolar_params *polarParams)
 {
   
 
@@ -1137,15 +1137,14 @@ int8_t polar_decoder_int16(int16_t *input,
 	 B[1],B[0],Cprime[1],Cprime[0],crc,
    	 rxcrc,polarParams->payloadBits);
 #endif
-  if (((uint64_t)crc) == rxcrc) {
-    int k=0;
-    // copy quadwords without CRC directly
-    for (k=0;k<polarParams->payloadBits/64;k++) out[k]=B[k];
+  int k=0;
+  // copy quadwords without CRC directly
+  for (k=0;k<polarParams->payloadBits/64;k++) out[k]=B[k];
   // copy last one
-    out[k] = B[k] & (((uint64_t)1<<(polarParams->payloadBits&63))-1);
-    return(0);
-  }
+  out[k] = B[k] & (((uint64_t)1<<(polarParams->payloadBits&63))-1);
+
+  return(crc^rxcrc);
+  
 
-  else  return(-1);
 
 }

openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h

@@ -148,9 +148,9 @@ void polar_encoder_dci(uint32_t *in,
 					   uint16_t n_RNTI);
 
 void polar_encoder_fast(uint64_t *A,
-		uint32_t *out,
-		int32_t crcmask,
-		t_nrPolar_paramsPtr polarParams);
+			uint32_t *out,
+			int32_t crcmask,
+			t_nrPolar_paramsPtr polarParams);
 
 int8_t polar_decoder(double *input,
 		 	 	 	 uint8_t *output,
@@ -158,9 +158,9 @@ int8_t polar_decoder(double *input,
 					 uint8_t listSize,
 					 uint8_t pathMetricAppr);
 
-int8_t polar_decoder_int16(int16_t *input,
-			   uint64_t *out,
-			   t_nrPolar_params *polarParams);
+uint32_t polar_decoder_int16(int16_t *input,
+			     uint64_t *out,
+			     t_nrPolar_params *polarParams);
 
 int8_t polar_decoder_aPriori(double *input,
 							 uint32_t *output,

openair1/PHY/NR_TRANSPORT/nr_dci.c

@@ -222,7 +222,8 @@ uint8_t nr_generate_dci_top(NR_gNB_PDCCH pdcch_vars,
   t_nrPolar_paramsPtr currentPtr = nr_polar_params(*nrPolar_params, NR_POLAR_DCI_MESSAGE_TYPE, dci_alloc.size, dci_alloc.L);
 #endif
 
-polar_encoder_dci(dci_alloc.dci_pdu, encoder_output, currentPtr, pdcch_params.rnti);
+  //polar_encoder_dci(dci_alloc.dci_pdu, encoder_output, currentPtr, pdcch_params.rnti);
+  polar_encoder_fast(dci_alloc.dci_pdu, encoder_output, pdcch_params.rnti,currentPtr);
 
 #ifdef DEBUG_CHANNEL_CODING
   printf("polar rnti %d\n",pdcch_params.rnti);

openair1/PHY/NR_UE_TRANSPORT/nr_pbch.c

@@ -661,8 +661,7 @@ int nr_rx_pbch( PHY_VARS_NR_UE *ue,
   decoderState = polar_decoder_int16(pbch_e_rx,(uint8_t*)&nr_ue_pbch_vars->pbch_a_prime,currentPtr);
 
 
-  if(decoderState == -1)
-  	return(decoderState);
+  if(decoderState > 0)	return(decoderState);
   	
   	//printf("polar decoder output 0x%08x\n",nr_ue_pbch_vars->pbch_a_prime);