Fixed bug in pbch_encode

srslte/examples/pdsch_enodeb.c

@@ -576,7 +576,7 @@ int main(int argc, char **argv) {
 
       srslte_pbch_mib_pack(&cell, sfn, bch_payload);
       if (sf_idx == 0) {
-        srslte_pbch_encode(&pbch, bch_payload, slot1_symbols);
+        srslte_pbch_encode(&pbch, bch_payload, slot1_symbols, nf%4);
       }
 
       srslte_pcfich_encode(&pcfich, cfi, sf_symbols, sf_idx);       

srslte/include/srslte/phch/pbch.h

@@ -98,7 +98,8 @@ SRSLTE_API int srslte_pbch_decode(srslte_pbch_t *q,
 
 SRSLTE_API int srslte_pbch_encode(srslte_pbch_t *q, 
                            uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN], 
-                           cf_t *slot1_symbols[SRSLTE_MAX_PORTS]);
+                           cf_t *slot1_symbols[SRSLTE_MAX_PORTS], 
+                           uint32_t frame_idx);
 
 SRSLTE_API void srslte_pbch_decode_reset(srslte_pbch_t *q);
 

srslte/lib/ch_estimation/chest_ul.c

@@ -35,6 +35,7 @@
 
 #include "srslte/config.h"
 
+#include "srslte/dft/dft_precoding.h"
 #include "srslte/ch_estimation/chest_ul.h"
 #include "srslte/utils/vector.h"
 #include "srslte/utils/convolution.h"
@@ -209,6 +210,11 @@ int srslte_chest_ul_estimate(srslte_chest_ul_t *q, cf_t *input, cf_t *ce,
     return SRSLTE_ERROR; 
   }
   
+  if (!srslte_dft_precoding_valid_prb(nof_prb)) {
+    fprintf(stderr, "Error invalid nof_prb=%d\n", nof_prb);
+    return SRSLTE_ERROR_INVALID_INPUTS;
+  }
+  
   int nrefs_sym = nof_prb*SRSLTE_NRE; 
   int nrefs_sf  = nrefs_sym*2; 
   

srslte/lib/enb/enb_dl.c

@@ -177,7 +177,7 @@ void srslte_enb_dl_put_mib(srslte_enb_dl_t *q, uint32_t tti)
 {
   if ((tti%10) == 0) {
     srslte_pbch_mib_pack(&q->cell, tti/10, q->bch_payload);
-    srslte_pbch_encode(&q->pbch, q->bch_payload, q->slot1_symbols);
+    srslte_pbch_encode(&q->pbch, q->bch_payload, q->slot1_symbols, ((tti/10)%4));
   }  
 }
 

srslte/lib/phch/pbch.c

@@ -514,7 +514,7 @@ int srslte_pbch_decode(srslte_pbch_t *q, cf_t *slot1_symbols, cf_t *ce_slot1[SRS
 
 /** Converts the MIB message to symbols mapped to SLOT #1 ready for transmission
  */
-int srslte_pbch_encode(srslte_pbch_t *q, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN], cf_t *slot1_symbols[SRSLTE_MAX_PORTS]) {
+int srslte_pbch_encode(srslte_pbch_t *q, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN], cf_t *slot1_symbols[SRSLTE_MAX_PORTS], uint32_t frame_idx) {
   int i;
   int nof_bits;
   cf_t *x[SRSLTE_MAX_LAYERS];
@@ -536,7 +536,9 @@ int srslte_pbch_encode(srslte_pbch_t *q, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_
     }
     memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (SRSLTE_MAX_LAYERS - q->cell.nof_ports));
     
-    if (q->frame_idx == 0) {
+    frame_idx=frame_idx%4;
+    
+    if (frame_idx == 0) {
       memcpy(q->data, bch_payload, sizeof(uint8_t) * SRSLTE_BCH_PAYLOAD_LEN);
 
       /* encode & modulate */
@@ -548,9 +550,9 @@ int srslte_pbch_encode(srslte_pbch_t *q, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_
       srslte_rm_conv_tx(q->data_enc, SRSLTE_BCH_ENCODED_LEN, q->rm_b, 4 * nof_bits);
     }
 
-    srslte_scrambling_b_offset(&q->seq, &q->rm_b[q->frame_idx * nof_bits],
-        q->frame_idx * nof_bits, nof_bits);
-    srslte_mod_modulate(&q->mod, &q->rm_b[q->frame_idx * nof_bits], q->d,
+    srslte_scrambling_b_offset(&q->seq, &q->rm_b[frame_idx * nof_bits],
+        frame_idx * nof_bits, nof_bits);
+    srslte_mod_modulate(&q->mod, &q->rm_b[frame_idx * nof_bits], q->d,
         nof_bits);
 
     /* layer mapping & precoding */
@@ -566,10 +568,6 @@ int srslte_pbch_encode(srslte_pbch_t *q, uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_
     for (i = 0; i < q->cell.nof_ports; i++) {
       srslte_pbch_put(q->symbols[i], slot1_symbols[i], q->cell);
     }
-    q->frame_idx++;
-    if (q->frame_idx == 4) {
-      q->frame_idx = 0;
-    }
     return SRSLTE_SUCCESS;
   } else {
     return SRSLTE_ERROR_INVALID_INPUTS;

srslte/lib/phch/test/pbch_test.c

@@ -114,7 +114,7 @@ int main(int argc, char **argv) {
     bch_payload_tx[i] = rand()%2;
   }
 
-  srslte_pbch_encode(&pbch, bch_payload_tx, slot1_symbols);
+  srslte_pbch_encode(&pbch, bch_payload_tx, slot1_symbols, 0);
 
   /* combine outputs */
   for (i=1;i<cell.nof_ports;i++) {