Fixed PDCCH not looking for aggregation level L=8. Fixed PCFICH encoder not accepting cfi=3

srslte/examples/pdsch_enodeb.c

@@ -66,7 +66,7 @@ srslte_cell_t cell = {
   
 int net_port = -1; // -1 generates random dataThat means there is some problem sending samples to the device
 
-uint32_t cfi=2;
+uint32_t cfi=3;
 uint32_t mcs_idx = 1, last_mcs_idx = 1;
 int nof_frames = -1;
 
@@ -597,7 +597,11 @@ int main(int argc, char **argv) {
         for (i=0;i<pdsch_cfg.grant.mcs.tbs/8;i++) {
           data[i] = rand()%256;
         }
+        if (sf_idx != 0 && sf_idx != 5) {
           send_data = true; 
+        } else {
+          send_data = false;           
+        }
       }        
       
       if (send_data) {

srslte/examples/pdsch_ue.c

@@ -550,8 +550,8 @@ int main(int argc, char **argv) {
             nof_trials++; 
             
             rsrq = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrq(&ue_dl.chest), rsrq, 0.1);
-            rsrp = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrp(&ue_dl.chest), rsrp, 0.1);      
-            noise = SRSLTE_VEC_EMA(srslte_chest_dl_get_noise_estimate(&ue_dl.chest), noise, 0.1);      
+            rsrp = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrp(&ue_dl.chest), rsrp, 0.05);      
+            noise = SRSLTE_VEC_EMA(srslte_chest_dl_get_noise_estimate(&ue_dl.chest), noise, 0.05);      
             nframes++;
             if (isnan(rsrq)) {
               rsrq = 0; 
@@ -585,6 +585,11 @@ int main(int argc, char **argv) {
         sfn++; 
         if (sfn == 1024) {
           sfn = 0; 
+          printf("reset\n");
+          ue_dl.pkt_errors = 0; 
+          ue_dl.pkts_total = 0; 
+          ue_dl.nof_detected = 0;           
+          nof_trials = 0; 
         } 
       }
       

srslte/lib/fec/viterbi.c

@@ -40,6 +40,8 @@
 
 #define TB_ITER 3
 
+#define DEFAULT_GAIN 10
+
 //#undef LV_HAVE_SSE
 
 int decode37(void *o, uint8_t *symbols, uint8_t *data, uint32_t frame_length) {
@@ -132,7 +134,7 @@ int init37(srslte_viterbi_t *q, uint32_t poly[3], uint32_t framebits, bool tail_
   q->K = 7;
   q->R = 3;
   q->framebits = framebits;
-  q->gain_quant = 32; 
+  q->gain_quant = DEFAULT_GAIN; 
   q->tail_biting = tail_biting;
   q->decode = decode37;
   q->free = free37;
@@ -168,7 +170,7 @@ int init37_sse(srslte_viterbi_t *q, uint32_t poly[3], uint32_t framebits, bool t
   q->K = 7;
   q->R = 3;
   q->framebits = framebits;
-  q->gain_quant = 20; 
+  q->gain_quant = DEFAULT_GAIN; 
   q->tail_biting = tail_biting;
   q->decode = decode37_sse;
   q->free = free37_sse;

srslte/lib/phch/cqi.c

@@ -141,7 +141,11 @@ bool srslte_cqi_send(uint32_t I_cqi_pmi, uint32_t tti) {
 /* SNR-to-CQI conversion, got from "Downlink SNR to CQI Mapping for Different Multiple Antenna Techniques in LTE"
  * Table III. 
 */
-static float cqi_to_snr_table[15] = { 1.95, 4, 6, 8, 10, 11.95, 14.05, 16, 17.9, 19.9, 21.5, 23.45, 25.0, 27.30, 29};
+// Original version
+//static float cqi_to_snr_table[15] = { 1.95, 4, 6, 8, 10, 11.95, 14.05, 16, 17.9, 19.9, 21.5, 23.45, 25.0, 27.30, 29};
+
+// From experimental measurements @ 5 MHz 
+static float cqi_to_snr_table[15] = { 0, 1.25, 2.5, 3.75, 5, 6, 7.5, 9, 11.5, 13.0, 15.0, 18, 20, 22.5, 26.5};
 
 uint8_t srslte_cqi_from_snr(float snr)
 {

srslte/lib/phch/pcfich.c

@@ -134,7 +134,7 @@ float srslte_pcfich_cfi_decode(srslte_pcfich_t *q, uint32_t *cfi) {
 /** Encodes the CFI producing a vector of 32 bits.
  *  36.211 10.3 section 5.3.4
  */
-int srslte_pcfich_cfi_encode(int cfi, uint8_t bits[PCFICH_CFI_LEN]) {
+int srslte_pcfich_cfi_encode(uint32_t cfi, uint8_t bits[PCFICH_CFI_LEN]) {
   if (cfi < 1 || cfi > 3) {
     return SRSLTE_ERROR_INVALID_INPUTS;
   } else{
@@ -220,7 +220,7 @@ int srslte_pcfich_encode(srslte_pcfich_t *q, uint32_t cfi, cf_t *slot_symbols[SR
   int i;
 
   if (q                 != NULL                 && 
-      cfi               <  3                    &&
+      cfi               <=  3                    &&
       slot_symbols      != NULL                 && 
       subframe         <  SRSLTE_NSUBFRAMES_X_FRAME) 
   {

srslte/lib/phch/pdcch.c

@@ -192,7 +192,7 @@ uint32_t srslte_pdcch_ue_locations(srslte_pdcch_t *q, srslte_dci_location_t *c,
 
   k = 0;
   // All aggregation levels from 8 to 1
-  for (l = 0; l < 3; l++) {
+  for (l = 3; l >= 0; l--) {
     L = (1 << l);
     // For all possible ncce offset
     for (i = 0; i < SRSLTE_MIN(q->nof_cce / L, S[l]/PDCCH_FORMAT_NOF_CCE(l)); i++) {

srslte/lib/ue/ue_dl.c

@@ -194,16 +194,12 @@ int srslte_ue_dl_decode_fft_estimate(srslte_ue_dl_t *q, cf_t *input, uint32_t sf
     
     /* Correct SFO multiplying by complex exponential in the time domain */
     if (q->sample_offset) {
-      struct timeval t[3];
-      gettimeofday(&t[1], NULL);
       for (int i=0;i<2*SRSLTE_CP_NSYMB(q->cell.cp);i++) {
         srslte_cfo_correct(&q->sfo_correct, 
                          &q->sf_symbols[i*q->cell.nof_prb*SRSLTE_NRE], 
                          &q->sf_symbols[i*q->cell.nof_prb*SRSLTE_NRE], 
                          q->sample_offset / q->fft.symbol_sz);
       }
-      gettimeofday(&t[2], NULL);
-      get_time_interval(t);
     }
     
     return srslte_ue_dl_decode_estimate(q, sf_idx, cfi); 
@@ -221,7 +217,8 @@ int srslte_ue_dl_decode_estimate(srslte_ue_dl_t *q, uint32_t sf_idx, uint32_t *c
 
     /* First decode PCFICH and obtain CFI */
     if (srslte_pcfich_decode(&q->pcfich, q->sf_symbols, q->ce, 
-                      srslte_chest_dl_get_noise_estimate(&q->chest), sf_idx, cfi, &cfi_corr)<0) {
+                             srslte_chest_dl_get_noise_estimate(&q->chest), 
+                             sf_idx, cfi, &cfi_corr)<0) {
       fprintf(stderr, "Error decoding PCFICH\n");
       return SRSLTE_ERROR;
     }