Fixes 15MHz for MIMO srsenb

srsenb/src/phy/txrx.cc

@@ -82,11 +82,19 @@ void txrx::run_thread()
   uint32_t sf_len = SRSLTE_SF_LEN_PRB(worker_com->cell.nof_prb);
   
   float samp_rate = srslte_sampling_freq_hz(worker_com->cell.nof_prb);
+#if 0
   if (30720%((int) samp_rate/1000) == 0) {
     radio_h->set_master_clock_rate(30.72e6);        
   } else {
     radio_h->set_master_clock_rate(23.04e6);        
   }
+#else
+  if (samp_rate < 10e6) {
+    radio_h->set_master_clock_rate(4 * samp_rate);
+  } else {
+    radio_h->set_master_clock_rate(samp_rate);
+  }
+#endif
   
   log_h->console("Setting Sampling frequency %.2f MHz\n", (float) samp_rate/1000000);