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srsRAN_4G
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Fixed SRS not working with some configurations

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master
ismagom 10 years ago
parent 121f363898
commit ce5bece317
4 changed files with 57 additions and 47 deletions
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65
matlab/tests/srs_test.m
Unescape Escape View File

@ -1,44 +1,47 @@
clear
ueConfig=struct('NCellID',1,'NULRB',25,'DuplexMode','FDD','NSubframe',0,'NFrame',0,'CyclicPrefixUL','Normal','NTxAnts',1);
srsConfig=struct('NTxAnts',1,'ConfigIdx',0,'SeqGroup',1,'SeqIdx',0,'TxComb',0);
ueConfig=struct('NCellID',1,'NULRB',100,'DuplexMode','FDD','NSubframe',0,'CyclicPrefixUL','Normal','NTxAnts',1);
srsConfig=struct('NTxAnts',1,'ConfigIdx',317,'SeqGroup',1,'SeqIdx',0,'TxComb',0);
addpath('../../build/srslte/lib/ch_estimation/test')
for csbw=2:7
for uebw=0:3
for hop=0:3
for ncs=0:7
for n_rrc=0:23
srsConfig.BWConfig = csbw;
srsConfig.BW = uebw;
srsConfig.CyclicShift = ncs;
srsConfig.HoppingBW = hop;
srsConfig.FreqPosition = n_rrc;
fprintf('Testing SRS: CSBW=%d, UEBW=%d, b_hop=%d n_rrc=%d, CyclicShift=%d\n',csbw, uebw, hop, n_rrc, ncs);
for k=0:50
for csbw=0:7
for uebw=0:3
for hop=0:3
for ncs=0
for n_rrc=1:5:20
ueConfig.NFrame=mod(32*k,1024);
srsConfig.BWConfig = csbw;
srsConfig.BW = uebw;
srsConfig.CyclicShift = ncs;
srsConfig.HoppingBW = hop;
srsConfig.FreqPosition = n_rrc;
fprintf('Testing SRS: Nframe=%d, CSBW=%d, UEBW=%d, b_hop=%d n_rrc=%d\n',ueConfig.NFrame, csbw, uebw, hop, n_rrc);
[sym_mat, info]=lteSRS(ueConfig,srsConfig);
[idx, info2]=lteSRSIndices(ueConfig,srsConfig);
subframe_mat = lteULResourceGrid(ueConfig);
subframe_mat(idx)=sym_mat;
[sym_mat, info]=lteSRS(ueConfig,srsConfig);
[idx, info2]=lteSRSIndices(ueConfig,srsConfig);
subframe_mat = lteULResourceGrid(ueConfig);
subframe_mat(idx)=sym_mat;
[sym, subframe]=srslte_refsignal_srs(ueConfig,srsConfig);
[sym, subframe]=srslte_refsignal_srs(ueConfig,srsConfig);
error_sym=max(abs(sym-sym_mat));
error_sf=max(abs(subframe_mat(:)-subframe));
error_sym=max(abs(sym-sym_mat));
error_sf=max(abs(subframe_mat(:)-subframe));
if (error_sym > 1e-3)
disp(info)
plot(1:length(sym),sym,1:length(sym_mat),sym_mat)
legend('srsLTE','Matlab')
error('Error in symbols');
end
if (error_sf > 1e-3)
disp(info2)
plot(abs(subframe-subframe_mat(:)))
error('Error in subframe');
if (error_sym > 3.5e-3)
disp(info)
plot(abs(sym-sym_mat))
legend('srsLTE','Matlab')
error('Error in symbols');
end
if (error_sf > 3.5e-3)
disp(info2)
plot(abs(subframe-subframe_mat(:)))
error('Error in subframe');
end
end
end
end
end
end
end
end

1
srsapps/ue/mac/src/mac.cc
Unescape Escape View File

@ -263,7 +263,6 @@ void mac::main_radio_loop() {
ul_buffer->generate_cqi_report();
}
// The UL buffer is released when successfully transmitted.
if (ul_buffer->is_released()) {
ul_buffer->ready();

2
srsapps/ue/phy/src/phy.cc
Unescape Escape View File

@ -358,6 +358,7 @@ bool phy::init_prach() {
ul_buffer* phy::get_ul_buffer(uint32_t tti)
{
tti=tti%10240;
if (tti + 1 < get_current_tti() && tti > NOF_ULDL_QUEUES) {
Warning("Warning access to PHY UL buffer too late. Requested TTI=%d while PHY is in %d\n", tti, get_current_tti());
}
@ -371,6 +372,7 @@ ul_buffer* phy::get_ul_buffer_adv(uint32_t tti)
dl_buffer* phy::get_dl_buffer(uint32_t tti)
{
tti=tti%10240;
if (tti + 4 < get_current_tti()) {
Warning("Warning access to PHY DL buffer too late. Requested TTI=%d while PHY is in %d\n", tti, get_current_tti());
// return NULL;

36
srslte/lib/ch_estimation/src/refsignal_ul.c
Unescape Escape View File

@ -79,7 +79,7 @@ uint32_t m_srs_b[4][4][8] = {{
/* m_srs for 40<n_rb<60. Table 5.5.3.2-2 */
{48, 48, 40, 36, 32, 24, 20, 16},
{24, 16, 20, 12, 16, 4, 4, 4},
{12, 16, 4, 12, 8, 4, 4, 8},
{12, 8, 4, 4, 8, 4, 4, 4},
{ 4, 4, 4, 4, 4, 4, 4, 4}},
{
/* m_srs for 60<n_rb<80. Table 5.5.3.2-3 */
@ -281,7 +281,6 @@ static void arg_r_uv_mprb(float *arg, uint32_t M_sc, uint32_t u, uint32_t v) {
uint32_t N_sz = largest_prime_lower_than(M_sc);
float q = get_q(u,v,N_sz);
float n_sz = (float) N_sz;
for (uint32_t i = 0; i < M_sc; i++) {
float m = (float) (i%N_sz);
arg[i] = -M_PI * q * m * (m + 1) / n_sz;
@ -289,7 +288,7 @@ static void arg_r_uv_mprb(float *arg, uint32_t M_sc, uint32_t u, uint32_t v) {
}
/* Computes argument of r_u_v signal */
static void compute_r_uv_arg(srslte_refsignal_ul_t *q, srslte_refsignal_dmrs_pusch_cfg_t *cfg, uint32_t nof_prb, uint32_t u, uint32_t v) {
static void compute_r_uv_arg(srslte_refsignal_ul_t *q, uint32_t nof_prb, uint32_t u, uint32_t v) {
if (nof_prb == 1) {
srslte_refsignal_r_uv_arg_1prb(q->tmp_arg, u);
} else if (nof_prb == 2) {
@ -340,7 +339,7 @@ void compute_r(srslte_refsignal_ul_t *q, uint32_t nof_prb, uint32_t ns, uint32_t
f_gh = q->f_gh[ns];
}
uint32_t u = (f_gh + (q->cell.id%30)+delta_ss)%30;
// Get sequence hopping number v
uint32_t v = 0;
if (nof_prb >= 6 && q->sequence_hopping_en) {
@ -348,7 +347,7 @@ void compute_r(srslte_refsignal_ul_t *q, uint32_t nof_prb, uint32_t ns, uint32_t
}
// Compute signal argument
compute_r_uv_arg(q, &q->pusch_cfg, nof_prb, u, v);
compute_r_uv_arg(q, nof_prb, u, v);
}
@ -688,19 +687,23 @@ uint32_t srslte_refsignal_srs_rb_L_cs(uint32_t bw_cfg, uint32_t nof_prb) {
return 0;
}
uint32_t srs_Fb(srslte_refsignal_srs_cfg_t *cfg, uint32_t nof_prb, uint32_t tti) {
uint32_t srs_Fb(srslte_refsignal_srs_cfg_t *cfg, uint32_t b, uint32_t nof_prb, uint32_t tti) {
uint32_t n_srs = tti/T_srs_table(cfg->I_srs);
uint32_t N_b = Nb[srsbwtable_idx(nof_prb)][cfg->B][cfg->bw_cfg];
uint32_t N_b = Nb[srsbwtable_idx(nof_prb)][b][cfg->bw_cfg];
uint32_t prod_1=1;
for (uint32_t b=cfg->b_hop;b<cfg->B-1;b++) {
prod_1 *= Nb[srsbwtable_idx(nof_prb)][b][cfg->bw_cfg];
for (uint32_t bp=cfg->b_hop+1;bp<b;bp++) {
prod_1 *= Nb[srsbwtable_idx(nof_prb)][bp][cfg->bw_cfg];
}
uint32_t prod_2 = prod_1*Nb[srsbwtable_idx(nof_prb)][cfg->B][cfg->bw_cfg];
if (N_b%2) {
return N_b/2*((n_srs%prod_2)/prod_1)+((n_srs%prod_2)/prod_1/2);
uint32_t prod_2 = prod_1*Nb[srsbwtable_idx(nof_prb)][b][cfg->bw_cfg];
uint32_t Fb;
if ((N_b%2) == 0) {
Fb = (N_b/2)*((n_srs%prod_2)/prod_1)+((n_srs%prod_2)/prod_1/2);
} else {
return N_b/2*(n_srs/prod_1);
Fb = (N_b/2)*(n_srs/prod_1);
}
return Fb;
}
/* Returns k0: frequency-domain starting position for ue-specific SRS */
@ -716,9 +719,11 @@ uint32_t srs_k0_ue(srslte_refsignal_srs_cfg_t *cfg, uint32_t nof_prb, uint32_t t
if (b <= cfg->b_hop) {
nb = (4*cfg->n_rrc/m_srs)%Nb[srsbwtable_idx(nof_prb)][b][cfg->bw_cfg];
} else {
nb = ((4*cfg->n_rrc/m_srs)+srs_Fb(cfg, nof_prb, tti))%Nb[srsbwtable_idx(nof_prb)][b][cfg->bw_cfg];
uint32_t Fb=srs_Fb(cfg, b, nof_prb, tti);
nb = ((4*cfg->n_rrc/m_srs)+Fb)%Nb[srsbwtable_idx(nof_prb)][b][cfg->bw_cfg];
}
k0 += 2*m_sc*nb;
k0 += 2*m_sc*nb;
}
return k0;
}
@ -741,6 +746,7 @@ int srslte_refsignal_srs_gen(srslte_refsignal_ul_t *q, uint32_t sf_idx, cf_t *r_
compute_r(q, M_sc/SRSLTE_NRE, ns, 0);
float alpha = 2*M_PI*q->srs_cfg.n_srs/8;
// Do complex exponential and adjust amplitude
for (int i=0;i<M_sc;i++) {
r_srs[(ns%2)*M_sc+i] = q->srs_cfg.beta_srs * cexpf(I*(q->tmp_arg[i] + alpha*i));

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