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srsLTE
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Handle NAN in NR PBCH reception and add unit test case

This commit is contained in:
Xavier Arteaga 2022-01-24 19:54:26 +01:00 committed by Xavier Arteaga
parent 70084cf9cc
commit 256bba0fd3
2 changed files with 101 additions and 9 deletions
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13
lib/src/phy/phch/pbch_nr.c
View File

@ -628,10 +628,23 @@ int srsran_pbch_nr_decode(srsran_pbch_nr_t* q,
return SRSRAN_ERROR;
}
// Avoid NAN getting into the demodulator
for (uint32_t i = 0; i < PBCH_NR_M; i++) {
if (isnan(__real__ symbols[i]) || isnan(__imag__ symbols[i])) {
symbols[i] = 0.0f;
}
}
// 7.3.3.2 Modulation
int8_t llr[PBCH_NR_E];
srsran_demod_soft_demodulate_b(SRSRAN_MOD_QPSK, symbols, llr, PBCH_NR_M);
// If all LLR are zero, no message could be received
if (srsran_vec_avg_power_bf(llr, PBCH_NR_E) == 0) {
SRSRAN_MEM_ZERO(msg, srsran_pbch_msg_nr_t, 1);
return SRSRAN_SUCCESS;
}
// TS 38.211 7.3.3 Physical broadcast channel
// 7.3.3.1 Scrambling
pbch_nr_scramble_rx(cfg, cfg->ssb_idx, llr, llr);

97
lib/src/phy/sync/test/ssb_decode_test.c
View File

@ -20,6 +20,9 @@
#include <srsran/phy/utils/random.h>
#include <stdlib.h>
#define SSB_DECODE_TEST_PCI_STRIDE 53
#define SSB_DECODE_TEST_SSB_STRIDE 3
// NR parameters
static uint32_t carrier_nof_prb = 52;
static srsran_subcarrier_spacing_t carrier_scs = srsran_subcarrier_spacing_15kHz;
@ -119,7 +122,7 @@ static void gen_pbch_msg(srsran_pbch_msg_nr_t* pbch_msg, uint32_t ssb_idx)
pbch_msg->crc = true;
}
static int test_case_1(srsran_ssb_t* ssb)
static int test_case_true(srsran_ssb_t* ssb)
{
// For benchmarking purposes
uint64_t t_encode_usec = 0;
@ -138,8 +141,8 @@ static int test_case_1(srsran_ssb_t* ssb)
// For each PCI...
uint64_t count = 0;
for (uint32_t pci = 0; pci < SRSRAN_NOF_NID_NR; pci += 23) {
for (uint32_t ssb_idx = 0; ssb_idx < ssb->Lmax; ssb_idx++, count++) {
for (uint32_t pci = 0; pci < SRSRAN_NOF_NID_NR; pci += SSB_DECODE_TEST_PCI_STRIDE) {
for (uint32_t ssb_idx = 0; ssb_idx < ssb->Lmax; ssb_idx += SSB_DECODE_TEST_SSB_STRIDE, count++) {
struct timeval t[3] = {};
// Build PBCH message
@ -149,7 +152,7 @@ static int test_case_1(srsran_ssb_t* ssb)
// Print encoded PBCH message
char str[512] = {};
srsran_pbch_msg_info(&pbch_msg_tx, str, sizeof(str));
INFO("test_case_1 - encoded pci=%d %s", pci, str);
INFO("test_case_true - encoded pci=%d %s", pci, str);
// Initialise baseband
srsran_vec_cf_zero(buffer, hf_len);
@ -175,7 +178,7 @@ static int test_case_1(srsran_ssb_t* ssb)
// Print decoded PBCH message
srsran_pbch_msg_info(&pbch_msg_rx, str, sizeof(str));
INFO("test_case_1 - decoded pci=%d %s crc=%s", pci, str, pbch_msg_rx.crc ? "OK" : "KO");
INFO("test_case_true - decoded pci=%d %s crc=%s", pci, str, pbch_msg_rx.crc ? "OK" : "KO");
// Assert PBCH message CRC
TESTASSERT(pbch_msg_rx.crc);
@ -191,7 +194,7 @@ static int test_case_1(srsran_ssb_t* ssb)
// Print decoded PBCH message
srsran_pbch_msg_info(&res.pbch_msg, str, sizeof(str));
INFO("test_case_1 - found pci=%d %s crc=%s", res.N_id, str, res.pbch_msg.crc ? "OK" : "KO");
INFO("test_case_true - found pci=%d %s crc=%s", res.N_id, str, res.pbch_msg.crc ? "OK" : "KO");
// Assert PBCH message CRC
TESTASSERT(res.pbch_msg.crc);
@ -200,11 +203,11 @@ static int test_case_1(srsran_ssb_t* ssb)
}
if (!count) {
ERROR("Error in test case 1: undefined division");
ERROR("Error in test case true: undefined division");
return SRSRAN_ERROR;
}
INFO("test_case_1 - %.1f usec/encode; %.1f usec/decode; %.1f usec/decode;",
INFO("test_case_true - %.1f usec/encode; %.1f usec/decode; %.1f usec/decode;",
(double)t_encode_usec / (double)(count),
(double)t_decode_usec / (double)(count),
(double)t_search_usec / (double)(count));
@ -212,6 +215,77 @@ static int test_case_1(srsran_ssb_t* ssb)
return SRSRAN_SUCCESS;
}
static int test_case_false(srsran_ssb_t* ssb)
{
// For benchmarking purposes
uint64_t t_decode_usec = 0;
uint64_t t_search_usec = 0;
// SSB configuration
srsran_ssb_cfg_t ssb_cfg = {};
ssb_cfg.srate_hz = srate_hz;
ssb_cfg.center_freq_hz = carrier_freq_hz;
ssb_cfg.ssb_freq_hz = ssb_freq_hz;
ssb_cfg.scs = ssb_scs;
ssb_cfg.pattern = ssb_pattern;
TESTASSERT(srsran_ssb_set_cfg(ssb, &ssb_cfg) == SRSRAN_SUCCESS);
// For each PCI...
uint32_t count = 0;
for (uint32_t pci = 0; pci < SRSRAN_NOF_NID_NR; pci += SSB_DECODE_TEST_PCI_STRIDE, count++) {
struct timeval t[3] = {};
// Initialise baseband
srsran_vec_cf_zero(buffer, hf_len);
// Channel, as it is zero it only adds noise
srsran_channel_awgn_run_c(&awgn, buffer, buffer, hf_len);
// Decode
gettimeofday(&t[1], NULL);
srsran_pbch_msg_nr_t pbch_msg_rx = {};
TESTASSERT(srsran_ssb_decode_pbch(ssb, pci, false, 0, buffer, &pbch_msg_rx) == SRSRAN_SUCCESS);
gettimeofday(&t[2], NULL);
get_time_interval(t);
t_decode_usec += t[0].tv_usec + t[0].tv_sec * 1000000UL;
// Print decoded PBCH message
char str[512] = {};
srsran_pbch_msg_info(&pbch_msg_rx, str, sizeof(str));
INFO("test_case_false - decoded pci=%d %s crc=%s", pci, str, pbch_msg_rx.crc ? "OK" : "KO");
// Assert PBCH message CRC is not okay
TESTASSERT(!pbch_msg_rx.crc);
// Search
srsran_ssb_search_res_t res = {};
gettimeofday(&t[1], NULL);
TESTASSERT(srsran_ssb_search(ssb, buffer, hf_len, &res) == SRSRAN_SUCCESS);
gettimeofday(&t[2], NULL);
get_time_interval(t);
t_search_usec += t[0].tv_usec + t[0].tv_sec * 1000000UL;
// Print decoded PBCH message
srsran_pbch_msg_info(&res.pbch_msg, str, sizeof(str));
INFO("test_case_false - false found pci=%d %s crc=%s", res.N_id, str, res.pbch_msg.crc ? "OK" : "KO");
// Assert PBCH message CRC
TESTASSERT(!res.pbch_msg.crc);
}
if (!count) {
ERROR("Error in test case true: undefined division");
return SRSRAN_ERROR;
}
INFO("test_case_false - %.1f usec/decode; %.1f usec/decode;",
(double)t_decode_usec / (double)(count),
(double)t_search_usec / (double)(count));
return SRSRAN_SUCCESS;
}
int main(int argc, char** argv)
{
int ret = SRSRAN_ERROR;
@ -248,7 +322,12 @@ int main(int argc, char** argv)
goto clean_exit;
}
if (test_case_1(&ssb) != SRSRAN_SUCCESS) {
if (test_case_true(&ssb) != SRSRAN_SUCCESS) {
ERROR("test case failed");
goto clean_exit;
}
if (test_case_false(&ssb) != SRSRAN_SUCCESS) {
ERROR("test case failed");
goto clean_exit;
}