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Fixed bug in PDSCH determining E with multiple codewords. Added demod_soft_free function

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master
ismagom 10 years ago
parent ee8ff24c43
commit 51f9dc9efb
13 changed files with 109 additions and 56 deletions
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3
lte/phy/include/liblte/phy/modem/demod_soft.h
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@ -46,7 +46,8 @@ typedef struct LIBLTE_API {
uint32_t max_symbols;
}demod_soft_t;
LIBLTE_API void demod_soft_init(demod_soft_t *q, uint32_t max_symbols);
LIBLTE_API int demod_soft_init(demod_soft_t *q, uint32_t max_symbols);
LIBLTE_API void demod_soft_free(demod_soft_t *q);
LIBLTE_API void demod_soft_table_set(demod_soft_t *q, modem_table_t *table);
LIBLTE_API void demod_soft_alg_set(demod_soft_t *q, enum alg alg_type);
LIBLTE_API void demod_soft_sigma_set(demod_soft_t *q, float sigma);

30
lte/phy/lib/modem/src/demod_soft.c
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@ -35,12 +35,40 @@
#include "soft_algs.h"
void demod_soft_init(demod_soft_t *q, uint32_t max_symbols) {
int demod_soft_init(demod_soft_t *q, uint32_t max_symbols) {
int ret = LIBLTE_ERROR;
bzero((void*)q,sizeof(demod_soft_t));
q->sigma = 1.0;
q->zones = vec_malloc(sizeof(uint32_t) * max_symbols);
if (!q->zones) {
perror("malloc");
goto clean_exit;
}
q->dd = vec_malloc(sizeof(float*) * max_symbols * 7);
if (!q->dd) {
perror("malloc");
goto clean_exit;
}
q->max_symbols = max_symbols;
ret = LIBLTE_SUCCESS;
clean_exit:
if (ret != LIBLTE_SUCCESS) {
demod_soft_free(q);
}
return ret;
}
void demod_soft_free(demod_soft_t *q) {
if (q->zones) {
free(q->zones);
}
if (q->dd) {
free(q->dd);
}
bzero((void*)q,sizeof(demod_soft_t));
}
void demod_soft_table_set(demod_soft_t *q, modem_table_t *table) {

4
lte/phy/lib/modem/test/modem_test.c
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@ -151,7 +151,6 @@ int main(int argc, char **argv) {
exit(-1);
}
/* generate random data */
srand(time(NULL));
for (i=0;i<num_bits;i++) {
@ -190,6 +189,9 @@ int main(int argc, char **argv) {
free(input);
modem_table_free(&mod);
if (soft_output) {
demod_soft_free(&demod_soft);
}
printf("Ok\n");
exit(0);

1
lte/phy/lib/modem/test/soft_demod_test.c
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@ -222,6 +222,7 @@ clean_exit:
free(input);
modem_table_free(&mod);
demod_soft_free(&demod_soft);
if (ret == 0) {
printf("Ok Mean Throughput: %.2f. Mbps ExTime: %.2f us\n", num_bits/mean_texec, mean_texec);

1
lte/phy/lib/phch/src/pbch.c
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@ -235,6 +235,7 @@ void pbch_free(pbch_t *q) {
sequence_free(&q->seq_pbch);
modem_table_free(&q->mod);
viterbi_free(&q->decoder);
demod_soft_free(&q->demod);
bzero(q, sizeof(pbch_t));

1
lte/phy/lib/phch/src/pcfich.c
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@ -116,6 +116,7 @@ void pcfich_free(pcfich_t *q) {
}
modem_table_free(&q->mod);
precoding_free(&q->precoding);
demod_soft_free(&q->demod);
bzero(q, sizeof(pcfich_t));
}

2
lte/phy/lib/phch/src/pdcch.c
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@ -171,6 +171,8 @@ void pdcch_free(pdcch_t *q) {
sequence_free(&q->seq_pdcch[i]);
}
demod_soft_free(&q->demod);
precoding_free(&q->precoding);
modem_table_free(&q->mod);
viterbi_free(&q->decoder);

47
lte/phy/lib/phch/src/pdsch.c
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@ -53,7 +53,7 @@ const lte_mod_t modulations[4] =
#ifdef DEBUG_IDX
cf_t *offset_original=NULL;
extern int indices[2048];
extern int indices[100000];
extern int indices_ptr;
#endif
@ -326,6 +326,7 @@ void pdsch_free(pdsch_t *q) {
for (i = 0; i < 4; i++) {
modem_table_free(&q->mod[i]);
}
demod_soft_free(&q->demod);
tdec_free(&q->decoder);
tcod_free(&q->encoder);
precoding_free(&q->precoding);
@ -536,16 +537,21 @@ int pdsch_decode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
uint32_t i;
uint32_t cb_len, rp, wp, rlen, F, n_e;
float *e_bits = q->pdsch_e;
uint32_t Qm = lte_mod_bits_x_symbol(harq_process->mcs.mod);
if (q != NULL &&
data != NULL &&
nb_e < q->max_symbols * lte_mod_bits_x_symbol(LTE_QAM64))
harq_process != NULL &&
nb_e < q->max_symbols * Qm)
{
rp = 0;
rp = 0;
wp = 0;
for (i = 0; i < harq_process->cb_segm.C; i++) {
uint32_t Gp = nb_e / Qm;
uint32_t gamma = Gp%harq_process->cb_segm.C;
bool early_stop = true;
for (i = 0; i < harq_process->cb_segm.C && early_stop; i++) {
/* Get read/write lengths */
if (i < harq_process->cb_segm.C - harq_process->cb_segm.C2) {
@ -564,13 +570,13 @@ int pdsch_decode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
F = 0;
}
if (i < harq_process->cb_segm.C - 1) {
n_e = nb_e / harq_process->cb_segm.C;
if (i <= harq_process->cb_segm.C - gamma - 1) {
n_e = Qm * (Gp/harq_process->cb_segm.C);
} else {
n_e = nb_e - rp;
n_e = Qm * ((uint32_t) ceilf((float) Gp/harq_process->cb_segm.C));
}
DEBUG("CB#%d: cb_len: %d, rlen: %d, wp: %d, rp: %d, F: %d, E: %d\n", i,
INFO("CB#%d: cb_len: %d, rlen: %d, wp: %d, rp: %d, F: %d, E: %d\n", i,
cb_len, rlen - F, wp, rp, F, n_e);
@ -584,10 +590,11 @@ int pdsch_decode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
/* Turbo Decoding with CRC-based early stopping */
q->nof_iterations = 0;
bool early_stop = false;
uint32_t len_crc;
uint8_t *cb_in_ptr;
crc_t *crc_ptr;
early_stop = false;
tdec_reset(&q->decoder, cb_len);
do {
@ -615,6 +622,7 @@ int pdsch_decode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
} while (q->nof_iterations < TDEC_MAX_ITERATIONS && !early_stop);
q->average_nof_iterations = VEC_EMA((float) q->nof_iterations, q->average_nof_iterations, 0.2);
// If CB CRC is not correct, early_stop will be false and wont continue with rest of CBs
/* Copy data to another buffer, removing the Codeblock CRC */
if (i < harq_process->cb_segm.C - 1) {
@ -633,7 +641,11 @@ int pdsch_decode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
rp += n_e;
}
DEBUG("END CB#%d: wp: %d, rp: %d\n", i, wp, rp);
if (!early_stop) {
INFO("CB %d failed. TB is erroneous.\n",i-1);
return LIBLTE_ERROR;
} else {
INFO("END CB#%d: wp: %d, rp: %d\n", i, wp, rp);
// Compute transport block CRC
par_rx = crc_checksum(&q->crc_tb, data, tbs);
@ -652,6 +664,8 @@ int pdsch_decode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
INFO("Error in TB parity\n",i);
return LIBLTE_ERROR;
}
}
} else {
return LIBLTE_ERROR_INVALID_INPUTS;
}
@ -706,6 +720,7 @@ int pdsch_decode(pdsch_t *q, cf_t *sf_symbols, cf_t *ce[MAX_PORTS], float noise_
}
}
/* TODO: only diversity is supported */
if (q->cell.nof_ports == 1) {
/* no need for layer demapping */
@ -753,12 +768,17 @@ int pdsch_encode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
uint32_t cb_len, rp, wp, rlen, F, n_e;
uint8_t *e_bits = q->pdsch_e;
int ret = LIBLTE_ERROR_INVALID_INPUTS;
uint32_t Qm = lte_mod_bits_x_symbol(harq_process->mcs.mod);
if (q != NULL &&
data != NULL &&
nb_e < q->max_symbols * lte_mod_bits_x_symbol(LTE_QAM64))
harq_process != NULL &&
nb_e < q->max_symbols * Qm)
{
uint32_t Gp = nb_e / Qm;
uint32_t gamma = Gp%harq_process->cb_segm.C;
if (q->rnti_is_set) {
if (rv_idx == 0) {
/* Compute transport block CRC */
@ -800,11 +820,10 @@ int pdsch_encode_tb(pdsch_t *q, uint8_t *data, uint32_t tbs, uint32_t nb_e,
} else {
F = 0;
}
if (i < harq_process->cb_segm.C - 1) {
n_e = nb_e / harq_process->cb_segm.C;
if (i <= harq_process->cb_segm.C - gamma - 1) {
n_e = Qm * (Gp/harq_process->cb_segm.C);
} else {
n_e = nb_e - wp;
n_e = Qm * ((uint32_t) ceilf((float) Gp/harq_process->cb_segm.C));
}
INFO("CB#%d: cb_len: %d, rlen: %d, wp: %d, rp: %d, F: %d, E: %d\n", i,

4
lte/phy/lib/phch/src/prb.c
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@ -36,14 +36,14 @@
#ifdef DEBUG_IDX
extern cf_t *offset_original;
LIBLTE_API int indices[2048];
LIBLTE_API int indices[100000];
LIBLTE_API int indices_ptr=0;
#endif
void print_indexes(cf_t *offset, int len) {
#ifdef DEBUG_IDX
for (int i=0;i<len;i++) {
indices[(i+indices_ptr)%2048]=offset-offset_original+i;
indices[(i+indices_ptr)%100000]=offset-offset_original+i;
}
indices_ptr+=len;
#endif

4
lte/phy/lib/phch/test/CMakeLists.txt
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@ -95,8 +95,8 @@ TARGET_LINK_LIBRARIES(pdsch_test lte_phy)
ADD_TEST(pdsch_test_bpsk pdsch_test -l 500 -m 1 -n 50 -r 2)
ADD_TEST(pdsch_test_qpsk pdsch_test -l 1000 -m 2 -n 50 -r 1)
ADD_TEST(pdsch_test_qam16 pdsch_test -l 50000 -m 4 -n 110)
ADD_TEST(pdsch_test_qam64 pdsch_test -l 5000 -m 6 -n 50 -r 0)
ADD_TEST(pdsch_test_qam16 pdsch_test -l 50000 -m 4 -n 100)
ADD_TEST(pdsch_test_qam64 pdsch_test -l 61664 -m 6 -n 100 -r 0)
BuildMex(MEXNAME pdsch SOURCES pdsch_test_mex.c LIBRARIES lte_phy liblte_mex)

11
lte/phy/lib/phch/test/pdsch_test.c
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@ -37,13 +37,13 @@
lte_cell_t cell = {
6, // nof_prb
1, // nof_ports
1, // cell_id
0, // cell_id
CPNORM, // cyclic prefix
R_1, // PHICH resources
R_1_6, // PHICH resources
PHICH_NORM // PHICH length
};
uint32_t cfi = 1;
uint32_t cfi = 2;
uint32_t tbs = 0;
uint32_t subframe = 1;
lte_mod_t modulation = LTE_BPSK;
@ -140,11 +140,11 @@ int main(int argc, char **argv) {
prb_alloc.slot[0].nof_prb = cell.nof_prb;
for (i=0;i<prb_alloc.slot[0].nof_prb;i++) {
prb_alloc.slot[0].prb_idx[i] = i;
prb_alloc.slot[0].prb_idx[i] = true;
}
memcpy(&prb_alloc.slot[1], &prb_alloc.slot[0], sizeof(ra_prb_slot_t));
ra_prb_get_re_dl(&prb_alloc, cell.nof_prb, cell.nof_ports, cell.nof_prb<10?(cfi+1):cfi, CPNORM);
ra_prb_get_re_dl(&prb_alloc, cell.nof_prb, cell.nof_ports, cell.nof_prb<10?(cfi+1):cfi, cell.cp);
/* init memory */
for (i=0;i<cell.nof_ports;i++) {
@ -223,6 +223,7 @@ int main(int argc, char **argv) {
ret = 0;
quit:
pdsch_free(&pdsch);
pdsch_harq_free(&harq_process);
for (i=0;i<cell.nof_ports;i++) {
if (ce[i]) {

4
lte/phy/lib/phch/test/pdsch_test_mex.c
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@ -44,7 +44,7 @@ void help()
("[decoded_ok, llr, rm, bits, symbols] = liblte_pdsch(enbConfig, pdschConfig, trblklen, rxWaveform)\n\n");
}
//extern int indices[2048];
extern int indices[2048];
/* the gateway function */
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
@ -167,8 +167,6 @@ void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
return;
}
//mexPrintf("C: %d, K1: %d, K2: %d\n", harq_process.cb_segm.C, harq_process.cb_segm.K1, harq_process.cb_segm.K2);
/** Allocate input buffers */
if (mexutils_read_cf(INPUT, &input_signal) < 0) {
mexErrMsgTxt("Error reading input signal\n");

13
matlab/tests/pdsch_bler.m
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@ -6,11 +6,11 @@
recordedSignal=[];
Npackets = 4;
SNR_values = linspace(10,20,4);
Npackets = 1;
SNR_values = linspace(15,20,4);
%% Choose RMC
[waveform,rgrid,rmccFgOut] = lteRMCDLTool('R.7',[1;0;0;1]);
[waveform,rgrid,rmccFgOut] = lteRMCDLTool('R.9',[1;0;0;1]);
waveform = sum(waveform,2);
if ~isempty(recordedSignal)
@ -78,8 +78,7 @@ for snr_idx=1:length(SNR_values)
%% Demodulate
frame_rx = lteOFDMDemodulate(rmccFgOut, rxWaveform);
%for sf_idx=0:Nsf
sf_idx=1;
for sf_idx=0:Nsf
subframe_waveform = rxWaveform(sf_idx*flen+1:(sf_idx+1)*flen);
subframe_rx=frame_rx(:,sf_idx*14+1:(sf_idx+1)*14);
rmccFgOut.NSubframe=sf_idx;
@ -88,7 +87,7 @@ for snr_idx=1:length(SNR_values)
% Perform channel estimation
[hest, nest] = lteDLChannelEstimate(rmccFgOut, cec, subframe_rx);
[cws,symbols] = ltePDSCHDecode(rmccFgOut,rmccFgOut.PDSCH,subframe_rx,hest,nest);
[cws,symbols,pdschSymbols,hestCH,indices] = ltePDSCHDecode2(rmccFgOut,rmccFgOut.PDSCH,subframe_rx,hest,nest);
[trblkout,blkcrc,dstate] = lteDLSCHDecode(rmccFgOut,rmccFgOut.PDSCH, ...
rmccFgOut.PDSCH.TrBlkSizes(sf_idx+1),cws);
@ -104,7 +103,7 @@ for snr_idx=1:length(SNR_values)
dec2 = 1;
end
decoded_liblte(snr_idx) = decoded_liblte(snr_idx)+dec2;
%end
end
if ~isempty(recordedSignal)
recordedSignal = recordedSignal(flen*10+1:end);

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