define speed of light in utils to avoid multiple local definitions

openair1/PHY/NR_UE_TRANSPORT/nr_ntn_l1.c

@@ -48,8 +48,6 @@ void fix_ntn_epoch_hfn(PHY_VARS_NR_UE *UE, int hfn, int frame)
   LOG_I(PHY, "setting epoch_hfn = %d\n", *epoch_hfn);
 }
 
-#define SPEED_OF_LIGHT 299792458
-
 // calculate TA and Doppler based on the NTN-Config, if abs_subframe_tx < 0 then apply only Doppler
 void apply_ntn_timing_advance_and_doppler(PHY_VARS_NR_UE *UE, const NR_DL_FRAME_PARMS *fp, int abs_subframe_tx)
 {

openair1/SIMULATION/TOOLS/random_channel.c

@@ -462,8 +462,7 @@ void get_cexp_doppler(struct complexd *cexp_doppler, channel_desc_t *chan_desc,
   // TS 38.104 - Table G.3-1
   uint16_t Dmin = 2;
   uint16_t Ds = 300;
-  double c = 299792458;
-  double v = chan_desc->max_Doppler * (c / (double)chan_desc->center_freq);
+  double v = chan_desc->max_Doppler * ((double) SPEED_OF_LIGHT / (double)chan_desc->center_freq);
 
 #ifdef DOPPLER_DEBUG
   printf("v = %f\n", v);