added a normalization factor

lib/src/phy/enb/enb_dl.c

@@ -388,7 +388,7 @@ void srslte_enb_dl_put_mbsfn_base(srslte_enb_dl_t *q, uint32_t tti)
 void srslte_enb_dl_gen_signal(srslte_enb_dl_t *q)
 {
   // TODO: PAPR control
-  float norm_factor = (float) sqrt(q->cell.nof_prb)/15/sqrt(q->ifft[0].symbol_sz);
+  float norm_factor = 0.05f / sqrt(q->cell.nof_prb);
   for (int i = 0; i < q->cell.nof_ports; i++) {
     srslte_ofdm_tx_sf(&q->ifft[i]);    
     srslte_vec_sc_prod_cfc(q->ifft[i].out_buffer, norm_factor, q->ifft[i].out_buffer, (uint32_t) SRSLTE_SF_LEN_PRB(q->cell.nof_prb));
@@ -397,7 +397,7 @@ void srslte_enb_dl_gen_signal(srslte_enb_dl_t *q)
 
 void srslte_enb_dl_gen_signal_mbsfn(srslte_enb_dl_t *q)
 {
-  float norm_factor = (float) sqrt(q->cell.nof_prb)/15/sqrt(q->ifft_mbsfn.symbol_sz);
+  float norm_factor = 0.05f / sqrt(q->cell.nof_prb);
   srslte_ofdm_tx_sf(&q->ifft_mbsfn);
   srslte_vec_sc_prod_cfc(q->ifft_mbsfn.out_buffer, norm_factor, q->ifft_mbsfn.out_buffer, (uint32_t) SRSLTE_SF_LEN_PRB(q->cell.nof_prb));
 }