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srsLTE
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Added option in pdsch_ue for experimental robust MMSE equalization (currently not working)

This commit is contained in:
Ismael Gomez 2016-02-17 20:21:53 +00:00
parent 121fe89ac1
commit cd5f750c86
5 changed files with 15033 additions and 15006 deletions
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16
srslte/examples/pdsch_ue.c
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@ -39,7 +39,6 @@
#include "srslte/srslte.h"
#ifndef DISABLE_RF
#include "srslte/rf/rf.h"
#include "srslte/rf/rf_utils.h"
@ -75,6 +74,7 @@ typedef struct {
bool disable_plots;
bool disable_plots_except_constellation;
bool disable_cfo;
bool use_robust_lmmse;
uint32_t time_offset;
int force_N_id_2;
uint16_t rnti;
@ -95,6 +95,7 @@ typedef struct {
void args_default(prog_args_t *args) {
args->disable_plots = false;
args->use_robust_lmmse = false;
args->disable_plots_except_constellation = false;
args->nof_subframes = -1;
args->rnti = SRSLTE_SIRNTI;
@ -117,7 +118,7 @@ void args_default(prog_args_t *args) {
}
void usage(prog_args_t *args, char *prog) {
printf("Usage: %s [agpPoOcildDnruv] -f rx_frequency (in Hz) | -i input_file\n", prog);
printf("Usage: %s [agpPoOcilLdDnruv] -f rx_frequency (in Hz) | -i input_file\n", prog);
#ifndef DISABLE_RF
printf("\t-a RF args [Default %s]\n", args->rf_args);
printf("\t-g RF fix RX gain [Default AGC]\n");
@ -132,6 +133,7 @@ void usage(prog_args_t *args, char *prog) {
printf("\t-c cell_id for input file [Default %d]\n", args->file_cell_id);
printf("\t-r RNTI in Hex [Default 0x%x]\n",args->rnti);
printf("\t-l Force N_id_2 [Default best]\n");
printf("\t-L (Experimental) Use Robust LMMSE estimation [Default false]\n");
printf("\t-C Disable CFO correction [Default %s]\n", args->disable_cfo?"Disabled":"Enabled");
printf("\t-t Add time offset [Default %d]\n", args->time_offset);
#ifndef DISABLE_GRAPHICS
@ -151,7 +153,7 @@ void usage(prog_args_t *args, char *prog) {
void parse_args(prog_args_t *args, int argc, char **argv) {
int opt;
args_default(args);
while ((opt = getopt(argc, argv, "aoglipPcOCtdDnvrfuUsS")) != -1) {
while ((opt = getopt(argc, argv, "aoglLipPcOCtdDnvrfuUsS")) != -1) {
switch (opt) {
case 'i':
args->input_file_name = argv[optind];
@ -195,6 +197,9 @@ void parse_args(prog_args_t *args, int argc, char **argv) {
case 'l':
args->force_N_id_2 = atoi(argv[optind]);
break;
case 'L':
args->use_robust_lmmse = true;
break;
case 'u':
args->net_port = atoi(argv[optind]);
break;
@ -407,6 +412,11 @@ int main(int argc, char **argv) {
/* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
srslte_ue_dl_set_rnti(&ue_dl, prog_args.rnti);
/* (Experimental) setup robust LMMSE estimation */
if (prog_args.use_robust_lmmse) {
srslte_chest_dl_set_robust_mmse_filter(&ue_dl.chest);
}
/* Initialize subframe counter */
sf_cnt = 0;

2
srslte/include/srslte/ch_estimation/chest_dl.h
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@ -83,6 +83,8 @@ SRSLTE_API void srslte_chest_dl_free(srslte_chest_dl_t *q);
SRSLTE_API void srslte_chest_dl_set_filter_w(srslte_chest_dl_t *q,
cf_t *w);
SRSLTE_API void srslte_chest_dl_set_robust_mmse_filter(srslte_chest_dl_t *q);
SRSLTE_API int srslte_chest_dl_estimate(srslte_chest_dl_t *q,
cf_t *input,
cf_t *ce[SRSLTE_MAX_PORTS],

19
srslte/lib/ch_estimation/src/chest_dl.c
View File

@ -41,6 +41,9 @@
#define ESTIMATE_NOISE_LS_PSS
#include "robust_mmse_25prb.h"
#include "robust_mmse_50prb.h"
/** 3GPP LTE Downlink channel estimator and equalizer.
* Estimates the channel in the resource elements transmitting references and interpolates for the rest
* of the resource grid.
@ -132,6 +135,18 @@ void srslte_chest_dl_set_filter_w(srslte_chest_dl_t *q, cf_t *w) {
q->w_filter = w;
}
void srslte_chest_dl_set_robust_mmse_filter(srslte_chest_dl_t *q) {
if (q->cell.nof_prb == 25) {
printf("Using robust LMMSE interpolation filter\n");
srslte_chest_dl_set_filter_w(q, (cf_t*) w_robust_25prb);
} else if (q->cell.nof_prb == 50) {
printf("Using robust LMMSE interpolation filter\n");
srslte_chest_dl_set_filter_w(q, (cf_t*) w_robust_50prb);
} else {
fprintf(stderr, "Error setting robust MMSE filter. Not available for %d PRB\n", q->cell.nof_prb);
}
}
/* Uses the difference between the averaged and non-averaged pilot estimates */
static float estimate_noise_pilots(srslte_chest_dl_t *q, cf_t *ce, uint32_t port_id)
{
@ -215,7 +230,7 @@ static void interpolate_filter_pilots(srslte_chest_dl_t *q, cf_t *pilot_estimate
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(0), &cesymb(3), &cesymb(1), 2);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(3), &cesymb(6), &cesymb(4), 2);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(6), &cesymb(9), &cesymb(7), 2);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(6), &cesymb(9), &cesymb(9), 2);
srslte_interp_linear_vector2(&q->srslte_interp_linvec, &cesymb(6), &cesymb(9), &cesymb(9), &cesymb(10), 2);
} else {
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(7), &cesymb(1), &cesymb(0), 1);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(1), &cesymb(7), &cesymb(2), 5);
@ -255,7 +270,7 @@ static void interpolate_pilots(srslte_chest_dl_t *q, cf_t *pilot_estimates, cf_t
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(0), &cesymb(3), &cesymb(1), 2);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(3), &cesymb(6), &cesymb(4), 2);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(6), &cesymb(9), &cesymb(7), 2);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(6), &cesymb(9), &cesymb(9), 2);
srslte_interp_linear_vector2(&q->srslte_interp_linvec, &cesymb(6), &cesymb(9), &cesymb(9), &cesymb(10), 2);
} else {
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(7), &cesymb(1), &cesymb(0), 1);
srslte_interp_linear_vector(&q->srslte_interp_linvec, &cesymb(1), &cesymb(7), &cesymb(2), 5);

30000
srslte/lib/ch_estimation/src/robust_mmse_25prb.h
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File diff suppressed because it is too large Load Diff

2
srslte/lib/phch/src/cqi.c
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@ -141,7 +141,7 @@ bool srslte_cqi_send(uint32_t I_cqi_pmi, uint32_t tti) {
/* SNR-to-CQI conversion, got from "Downlink SNR to CQI Mapping for Different Multiple Antenna Techniques in LTE"
* Table III.
*/
static float cqi_to_snr_table[15] = { 1.95, 4, 6, 8, 10, 11.95, 14.05, 16, 17.9, 19.9, 21.5, 23.45, 25.0, 27.30, 29};
static float cqi_to_snr_table[15] = { 1.95, 4, 6, 8, 10, 11.95, 14.05, 16, 17.9, 19.9, 21.5, 24, 26, 28, 30};
uint8_t srslte_cqi_from_snr(float snr)
{