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adressing the comments

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This commit is contained in:
rakesh mundlamuri
2023-04-24 11:05:05 +02:00
parent 5143133d33
commit 594fb18cc8
4 changed files with 33 additions and 5 deletions
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common/utils/nr/nr_common.c
+24
View File
@@ -706,3 +706,27 @@ void SLIV2SL(int SLIV,int *S,int *L) {
}
}
int get_ssb_subcarrier_offset(uint32_t absoluteFrequencySSB, uint32_t absoluteFrequencyPointA)
{
uint32_t absolute_diff = (absoluteFrequencySSB - absoluteFrequencyPointA);
const int scaling_5khz = absoluteFrequencyPointA < 600000 ? 3 : 1;
return ((absolute_diff / scaling_5khz) % 24);
}
uint32_t get_ssb_offset_to_pointA(uint32_t absoluteFrequencySSB,
uint32_t absoluteFrequencyPointA,
int ssbSubcarrierSpacing,
int frequency_range)
{
uint32_t absolute_diff = (absoluteFrequencySSB - absoluteFrequencyPointA);
const int scaling_5khz = absoluteFrequencyPointA < 600000 ? 3 : 1;
int sco = get_ssb_subcarrier_offset(absoluteFrequencySSB, absoluteFrequencyPointA);
const int scs_scaling = frequency_range == FR2 ? 1 << (ssbSubcarrierSpacing - 2) : 1 << ssbSubcarrierSpacing;
const int scaled_abs_diff = absolute_diff / scaling_5khz;
const int ssb_offset_point_a =
(scaled_abs_diff - sco) / 12
- 10 * scs_scaling; // absoluteFrequencySSB is the central frequency of SSB which is made by 20RBs in total
AssertFatal(ssb_offset_point_a % scs_scaling == 0, "PRB offset %d can create frequency offset\n", ssb_offset_point_a);
AssertFatal(sco % scs_scaling == 0, "ssb offset %d can create frequency offset\n", sco);
return ssb_offset_point_a;
}
common/utils/nr/nr_common.h
+5 -1
View File
@@ -101,7 +101,11 @@ void get_samplerate_and_bw(int mu,
unsigned int *samples_per_frame,
double *tx_bw,
double *rx_bw);
uint32_t get_ssb_offset_to_pointA(uint32_t absoluteFrequencySSB,
uint32_t absoluteFrequencyPointA,
int ssbSubcarrierSpacing,
int frequency_range);
int get_ssb_subcarrier_offset(uint32_t absoluteFrequencySSB, uint32_t absoluteFrequencyPointA);
#define CEILIDIV(a,b) ((a+b-1)/b)
#define ROUNDIDIV(a,b) (((a<<1)+b)/(b<<1))