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Added DRMS for UL. Changed chest to chest_dl

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master
ismagom 10 years ago
parent 1cbbbe9b9a
commit 45179ea823
11 changed files with 764 additions and 121 deletions
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57
lte/phy/include/liblte/phy/ch_estimation/chest.h
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@ -76,21 +76,6 @@ LIBLTE_API void chest_free(chest_t *q);
LIBLTE_API int chest_set_nof_ports(chest_t *q,
uint32_t nof_ports);
LIBLTE_API int chest_init_LTEDL(chest_t *q,
lte_cell_t cell);
LIBLTE_API int chest_ref_LTEDL_slot_port(chest_t *q,
uint32_t nslot,
uint32_t port_id,
lte_cell_t cell);
LIBLTE_API int chest_ref_LTEDL_slot(chest_t *q,
uint32_t nslot,
lte_cell_t cell);
LIBLTE_API int chest_ref_LTEDL(chest_t *q,
lte_cell_t cell);
LIBLTE_API int chest_ce_ref(chest_t *q,
cf_t *input,
uint32_t nslot,
@ -139,11 +124,51 @@ LIBLTE_API void chest_ce_fprint(chest_t *q,
uint32_t nslot,
uint32_t port_id);
LIBLTE_API int chest_ref_symbols(chest_t *q,
LIBLTE_API int chest_ref_get_symbols(chest_t *q,
uint32_t port_id,
uint32_t nslot,
uint32_t l[2]);
/*********************************************************
*
* Downlink Channel Estimator
*
*********************************************************/
LIBLTE_API int chest_init_LTEDL(chest_t *q,
lte_cell_t cell);
LIBLTE_API int chest_ref_set_LTEDL_slot_port(chest_t *q,
uint32_t nslot,
uint32_t port_id,
lte_cell_t cell);
LIBLTE_API int chest_ref_set_LTEDL_slot(chest_t *q,
uint32_t nslot,
lte_cell_t cell);
LIBLTE_API int chest_ref_set_LTEDL(chest_t *q,
lte_cell_t cell);
/*********************************************************
*
* Uplink Channel Estimator
*
*********************************************************/
LIBLTE_API int chest_init_LTEUL(chest_t *q,
lte_cell_t cell);
LIBLTE_API int chest_ref_set_LTEUL_slot(chest_t *q,
uint32_t nslot,
lte_cell_t cell);
LIBLTE_API int chest_ref_set_LTEUL(chest_t *q,
lte_cell_t cell);
/* High-level API */
/** TODO: The high-level API has N interfaces, one for each port */

20
lte/phy/include/liblte/phy/ch_estimation/refsignal.h
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@ -59,11 +59,31 @@ typedef struct LIBLTE_API{
cf_t *ch_est;
} refsignal_t;
typedef struct LIBLTE_API {
float beta; // amplitude scaling
uint32_t delta_ss; // Set to 0 for PUCCH
uint32_t cyclic_shift;
uint32_t cyclic_shift_for_drms; /* From DCI 0. Set to 0 if no PDCCH with DCI 0 for the same TB
or if the initial PUSCH is semi-persisently scheduled or
if the initial PUSCH is scheduled by the RA response grant */
bool group_hopping_en;
bool sequence_hopping_en;
} refsignal_ul_cfg_t;
LIBLTE_API int refsignal_init_LTEDL(refsignal_t *q,
uint32_t port_id,
uint32_t nslot,
lte_cell_t cell);
LIBLTE_API int refsignal_init_LTEUL_drms_pusch(refsignal_t *q,
uint32_t nof_prb,
uint32_t prb_start,
uint32_t nslot,
lte_cell_t cell,
refsignal_ul_cfg_t *drms_cfg);
LIBLTE_API void refsignal_free(refsignal_t *q);
LIBLTE_API int refsignal_put(refsignal_t *q,

2
lte/phy/include/liblte/phy/common/sequence.h
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@ -40,7 +40,7 @@ LIBLTE_API int sequence_init(sequence_t *q, uint32_t len);
LIBLTE_API void sequence_free(sequence_t *q);
LIBLTE_API int sequence_LTEPRS(sequence_t *q,
LIBLTE_API int sequence_LTE_pr(sequence_t *q,
uint32_t len,
uint32_t seed);

106
lte/phy/lib/ch_estimation/src/chest.c
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@ -259,17 +259,58 @@ int chest_init(chest_t *q, uint32_t nof_re, uint32_t nof_symbols, uint32_t nof_p
return ret;
}
void chest_free(chest_t *q) {
int p, n;
for (p=0;p<q->nof_ports;p++) {
for (n=0;n<NSLOTS_X_FRAME;n++) {
refsignal_free(&q->refsignal[p][n]);
}
}
#ifdef VOLK_INTERP
for (p=0;p<MAX_PORTS;p++) {
interp_free(&q->interp_freq[p]);
interp_free(&q->interp_time[p]);
}
#endif
bzero(q, sizeof(chest_t));
}
/* Fills l[2] with the symbols in the slot nslot that contain references.
* returns the number of symbols with references (in the slot)
*/
int chest_ref_get_symbols(chest_t *q, uint32_t port_id, uint32_t nslot, uint32_t l[2]) {
if (q != NULL &&
port_id < MAX_PORTS &&
nslot < NSLOTS_X_FRAME)
{
memcpy(l, q->refsignal[port_id][nslot].symbols_ref, sizeof(uint32_t) * q->refsignal[port_id][nslot].nsymbols);
return q->refsignal[port_id][nslot].nsymbols;
} else {
return LIBLTE_ERROR_INVALID_INPUTS;
}
}
/*********************************************************************
*
* Downlink Channel estimator
*
*********************************************************************/
int chest_init_LTEDL(chest_t *q, lte_cell_t cell) {
int ret;
ret = chest_init(q, cell.nof_prb * RE_X_RB, CP_NSYMB(cell.cp), cell.nof_ports);
if (ret != LIBLTE_SUCCESS) {
return ret;
} else {
return chest_ref_LTEDL(q, cell);
return chest_ref_set_LTEDL(q, cell);
}
}
int chest_ref_LTEDL_slot_port(chest_t *q, uint32_t nslot, uint32_t port_id, lte_cell_t cell) {
int chest_ref_set_LTEDL_slot_port(chest_t *q, uint32_t nslot, uint32_t port_id, lte_cell_t cell) {
int ret = LIBLTE_ERROR_INVALID_INPUTS;
if (q != NULL &&
@ -293,10 +334,10 @@ int chest_ref_LTEDL_slot_port(chest_t *q, uint32_t nslot, uint32_t port_id, lte_
return ret;
}
int chest_ref_LTEDL_slot(chest_t *q, uint32_t nslot, lte_cell_t cell) {
int chest_ref_set_LTEDL_slot(chest_t *q, uint32_t nslot, lte_cell_t cell) {
int p, ret;
for (p=0;p<q->nof_ports;p++) {
ret = chest_ref_LTEDL_slot_port(q, nslot, p, cell);
ret = chest_ref_set_LTEDL_slot_port(q, nslot, p, cell);
if (ret != LIBLTE_SUCCESS) {
return ret;
}
@ -304,10 +345,10 @@ int chest_ref_LTEDL_slot(chest_t *q, uint32_t nslot, lte_cell_t cell) {
return LIBLTE_SUCCESS;
}
int chest_ref_LTEDL(chest_t *q, lte_cell_t cell) {
int chest_ref_set_LTEDL(chest_t *q, lte_cell_t cell) {
int n, ret;
for (n=0;n<NSLOTS_X_FRAME;n++) {
ret = chest_ref_LTEDL_slot(q, n, cell);
ret = chest_ref_set_LTEDL_slot(q, n, cell);
if (ret != LIBLTE_SUCCESS) {
return ret;
}
@ -315,37 +356,32 @@ int chest_ref_LTEDL(chest_t *q, lte_cell_t cell) {
return LIBLTE_SUCCESS;
}
void chest_free(chest_t *q) {
int p, n;
for (p=0;p<q->nof_ports;p++) {
for (n=0;n<NSLOTS_X_FRAME;n++) {
refsignal_free(&q->refsignal[p][n]);
}
}
#ifdef VOLK_INTERP
for (p=0;p<MAX_PORTS;p++) {
interp_free(&q->interp_freq[p]);
interp_free(&q->interp_time[p]);
}
#endif
bzero(q, sizeof(chest_t));
}
/* Fills l[2] with the symbols in the slot nslot that contain references.
* returns the number of symbols with references (in the slot)
*/
int chest_ref_symbols(chest_t *q, uint32_t port_id, uint32_t nslot, uint32_t l[2]) {
if (q != NULL &&
port_id < MAX_PORTS &&
nslot < NSLOTS_X_FRAME)
{
memcpy(l, q->refsignal[port_id][nslot].symbols_ref, sizeof(uint32_t) * q->refsignal[port_id][nslot].nsymbols);
return q->refsignal[port_id][nslot].nsymbols;
} else {
return LIBLTE_ERROR_INVALID_INPUTS;
}
}
/*********************************************************************
*
* TODO: Uplink Channel estimator
*
*
*********************************************************************/
/** High-level API

234
lte/phy/lib/ch_estimation/src/refsignal.c
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@ -38,46 +38,49 @@
#include "liblte/phy/utils/debug.h"
#include "liblte/phy/common/sequence.h"
#include "ul_rs_tables.h"
#define idx(x, y) (l*nof_refs_x_symbol+i)
int refsignal_v(uint32_t port_id, uint32_t ns, uint32_t symbol_id) {
int v=-1;
switch(port_id) {
int refsignal_v(uint32_t port_id, uint32_t ns, uint32_t symbol_id)
{
int v = -1;
switch (port_id) {
case 0:
if (symbol_id == 0) {
v=0;
v = 0;
} else {
v=3;
v = 3;
}
break;
case 1:
if (symbol_id == 0) {
v=3;
v = 3;
} else {
v=0;
v = 0;
}
break;
case 2:
v=3*(ns%2);
v = 3 * (ns % 2);
break;
case 3:
v=3+3*(ns%2);
v = 3 + 3 * (ns % 2);
break;
}
return v;
}
uint32_t refsignal_k(uint32_t m, uint32_t v, uint32_t cell_id) {
return 6*m+((v+(cell_id%6))%6);
uint32_t refsignal_k(uint32_t m, uint32_t v, uint32_t cell_id)
{
return 6 * m + ((v + (cell_id % 6)) % 6);
}
int refsignal_put(refsignal_t *q, cf_t *slot_symbols) {
int refsignal_put(refsignal_t * q, cf_t * slot_symbols)
{
uint32_t i;
uint32_t fidx, tidx;
if (q != NULL &&
slot_symbols != NULL)
{
for (i=0;i<q->nof_refs;i++) {
if (q != NULL && slot_symbols != NULL) {
for (i = 0; i < q->nof_refs; i++) {
fidx = q->refs[i].freq_idx; // reference frequency index
tidx = q->refs[i].time_idx; // reference time index
slot_symbols[SAMPLE_IDX(q->nof_prb, tidx, fidx)] = q->refs[i].simbol;
@ -91,8 +94,9 @@ int refsignal_put(refsignal_t *q, cf_t *slot_symbols) {
/** Initializes refsignal_t object according to 3GPP 36.211 6.10.1
*
*/
int refsignal_init_LTEDL(refsignal_t *q, uint32_t port_id, uint32_t nslot,
lte_cell_t cell) {
int refsignal_init_LTEDL(refsignal_t * q, uint32_t port_id, uint32_t nslot,
lte_cell_t cell)
{
uint32_t c_init;
uint32_t ns, l, lp[2];
@ -106,9 +110,7 @@ int refsignal_init_LTEDL(refsignal_t *q, uint32_t port_id, uint32_t nslot,
if (q != NULL &&
port_id < MAX_PORTS &&
nslot < NSLOTS_X_FRAME &&
lte_cell_isvalid(&cell))
{
nslot < NSLOTS_X_FRAME && lte_cell_isvalid(&cell)) {
bzero(q, sizeof(refsignal_t));
bzero(&seq, sizeof(sequence_t));
@ -131,7 +133,7 @@ int refsignal_init_LTEDL(refsignal_t *q, uint32_t port_id, uint32_t nslot,
q->nof_refs = nof_refs_x_symbol * nof_ref_symbols;
q->nsymbols = nof_ref_symbols;
q->voffset = cell.id%6;
q->voffset = cell.id % 6;
q->nof_prb = cell.nof_prb;
q->symbols_ref = malloc(sizeof(uint32_t) * nof_ref_symbols);
@ -156,7 +158,7 @@ int refsignal_init_LTEDL(refsignal_t *q, uint32_t port_id, uint32_t nslot,
c_init = 1024 * (7 * (ns + 1) + lp[l] + 1) * (2 * cell.id + 1)
+ 2 * cell.id + N_cp;
ret = sequence_LTEPRS(&seq, 2 * 2 * MAX_PRB, c_init);
ret = sequence_LTE_pr(&seq, 2 * 2 * MAX_PRB, c_init);
if (ret != LIBLTE_SUCCESS) {
goto free_and_exit;
}
@ -167,12 +169,14 @@ int refsignal_init_LTEDL(refsignal_t *q, uint32_t port_id, uint32_t nslot,
mp = i + MAX_PRB - cell.nof_prb;
/* generate signal */
__real__ q->refs[idx(l,i)].simbol = (1 - 2 * (float) seq.c[2 * mp]) / sqrt(2);
__imag__ q->refs[idx(l,i)].simbol = (1 - 2 * (float) seq.c[2 * mp + 1]) / sqrt(2);
__real__ q->refs[idx(l, i)].simbol =
(1 - 2 * (float) seq.c[2 * mp]) / sqrt(2);
__imag__ q->refs[idx(l, i)].simbol =
(1 - 2 * (float) seq.c[2 * mp + 1]) / sqrt(2);
/* mapping to resource elements */
q->refs[idx(l,i)].freq_idx = refsignal_k(i, (uint32_t) v, cell.id);
q->refs[idx(l,i)].time_idx = lp[l];
q->refs[idx(l, i)].freq_idx = refsignal_k(i, (uint32_t) v, cell.id);
q->refs[idx(l, i)].time_idx = lp[l];
}
}
ret = LIBLTE_SUCCESS;
@ -187,7 +191,179 @@ free_and_exit:
return ret;
}
void refsignal_free(refsignal_t *q) {
// n_drms_2 table 5.5.2.1.1-1 from 36.211
uint32_t n_drms_2[8] = { 0, 6, 3, 4, 2, 8, 10, 9 };
// n_drms_1 table 5.5.2.1.1-2 from 36.211
uint32_t n_drms_1[8] = { 0, 2, 3, 4, 6, 8, 9, 10 };
/* Generation of the reference signal sequence according to Section 5.5.1 of 36.211 */
int rs_sequence(ref_t * refs, uint32_t len, float alpha, uint32_t ns, uint32_t cell_id,
refsignal_ul_cfg_t * cfg)
{
uint32_t i;
// Calculate u and v
uint32_t u, v;
uint32_t f_ss = (((cell_id % 30) + cfg->delta_ss) % 30);
if (cfg->group_hopping_en) {
sequence_t seq;
sequence_LTE_pr(&seq, cell_id / 30, 160);
uint32_t f_gh = 0;
for (i = 0; i < 8; i++) {
f_gh += seq.c[8 * ns + i] << i;
}
sequence_free(&seq);
u = ((f_gh%30) + f_ss) % 30;
} else {
u = f_ss % 30;
}
if (len < 6 * RE_X_RB) {
v = 0;
} else {
if (!cfg->group_hopping_en && cfg->sequence_hopping_en) {
sequence_t seq;
sequence_LTE_pr(&seq, ((cell_id / 30) << 5) + f_ss, 20);
v = seq.c[ns];
sequence_free(&seq);
} else {
v = 0;
}
}
if (len >= 3 * RE_X_RB) {
uint32_t n_sz;
uint32_t q;
float q_hat;
/* get largest prime n_zc<len */
for (i = NOF_PRIME_NUMBERS - 1; i > 0; i--) {
if (prime_numbers[i] < len) {
n_sz = prime_numbers[i];
break;
}
}
q_hat = (float) n_sz *(u + 1) / 31;
if ((((uint32_t) (2 * q_hat)) % 2) == 0) {
q = (uint32_t) (q_hat + 0.5) + v;
} else {
q = (uint32_t) (q_hat + 0.5) - v;
}
cf_t *x_q = malloc(sizeof(cf_t) * n_sz);
if (!x_q) {
perror("malloc");
return LIBLTE_ERROR;
}
for (i = 0; i < n_sz; i++) {
x_q[i] =
cexpf(-I * M_PI * (float) q * (float) i * ((float) i + 1) / n_sz);
}
for (i = 0; i < len; i++) {
refs[i].simbol = cfg->beta * cexpf(I * alpha * i) * x_q[i % n_sz];
}
free(x_q);
} else {
if (len == RE_X_RB) {
for (i = 0; i < len; i++) {
refs[i].simbol = cfg->beta * cexpf(I * (phi_M_sc_12[u][i] * M_PI / 4 + alpha * i));
}
} else {
for (i = 0; i < len; i++) {
refs[i].simbol = cfg->beta * cexpf(I * (phi_M_sc_24[u][i] * M_PI / 4 + alpha * i));
}
}
}
return LIBLTE_SUCCESS;
}
/** Initializes refsignal_t object according to 3GPP 36.211 5.5.2
*
*/
int refsignal_init_LTEUL_drms_pusch(refsignal_t * q, uint32_t nof_prb, uint32_t prb_start,
uint32_t nslot, lte_cell_t cell, refsignal_ul_cfg_t * cfg)
{
uint32_t i;
int ret = LIBLTE_ERROR_INVALID_INPUTS;
uint32_t n_prs;
uint32_t M_sc;
float alpha;
if (q != NULL && nslot < NSLOTS_X_FRAME && lte_cell_isvalid(&cell)) {
bzero(q, sizeof(refsignal_t));
M_sc = nof_prb * RE_X_RB;
q->nof_refs = M_sc;
q->nsymbols = 1;
q->voffset = cell.id % 6;
q->nof_prb = cell.nof_prb;
q->symbols_ref = malloc(sizeof(uint32_t) * 1);
if (!q->symbols_ref) {
perror("malloc");
goto free_and_exit;
}
if (CP_ISNORM(cell.cp)) {
q->symbols_ref[0] = 3;
} else {
q->symbols_ref[0] = 2;
}
q->refs = vec_malloc(q->nof_refs * sizeof(ref_t));
if (!q->refs) {
goto free_and_exit;
}
q->ch_est = vec_malloc(q->nof_refs * sizeof(cf_t));
if (!q->ch_est) {
goto free_and_exit;
}
/* Calculate n_prs */
uint32_t c_init;
sequence_t seq;
c_init = ((cell.id / 30) << 5) + (((cell.id % 30) + cfg->delta_ss) % 30);
ret = sequence_LTE_pr(&seq, 8 * CP_NSYMB(cell.cp) * 20, c_init);
if (ret != LIBLTE_SUCCESS) {
goto free_and_exit;
}
n_prs = 0;
for (i = 0; i < 8; i++) {
n_prs += (seq.c[8 * CP_NSYMB(cell.cp) * nslot + i] << i);
}
sequence_free(&seq);
// Calculate cyclic shift alpha
uint32_t n_cs =
(n_drms_1[cfg->cyclic_shift] +
n_drms_2[cfg->cyclic_shift_for_drms] + n_prs) % 12;
alpha = 2 * M_PI * (n_cs) / 12;
if (rs_sequence(q->refs, M_sc, alpha, cell.id, nslot, cfg)) {
fprintf(stderr, "Error generating RS sequence\n");
goto free_and_exit;
}
/* mapping to resource elements */
for (i=0;i<M_sc;i++) {
q->refs[i].freq_idx = prb_start*RE_X_RB + i;
q->refs[i].time_idx = q->symbols_ref[0];
}
ret = LIBLTE_SUCCESS;
}
free_and_exit:
if (ret == LIBLTE_ERROR) {
refsignal_free(q);
}
return ret;
}
void refsignal_free(refsignal_t * q)
{
if (q->symbols_ref) {
free(q->symbols_ref);
}
@ -199,5 +375,3 @@ void refsignal_free(refsignal_t *q) {
}
bzero(q, sizeof(refsignal_t));
}

127
lte/phy/lib/ch_estimation/src/ul_rs_tables.h
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@ -0,0 +1,127 @@
/**
*
* \section COPYRIGHT
*
* Copyright 2013-2014 The libLTE Developers. See the
* COPYRIGHT file at the top-level directory of this distribution.
*
* \section LICENSE
*
* This file is part of the libLTE library.
*
* libLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* libLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* A copy of the GNU Lesser General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include <stdint.h>
// Phi values for M_sc=12 Table 5.5.1.2-1 in 36.211
int phi_M_sc_12[30][12] = {{-1, 1, 3,-3, 3, 3, 1, 1, 3, 1,-3, 3},
{ 1, 1, 3, 3, 3,-1, 1,-3,-3, 1,-3, 3},
{ 1, 1,-3,-3,-3,-1,-3,-3, 1,-3, 1,-1},
{-1, 1, 1, 1, 1,-1,-3,-3, 1,-3, 3,-1},
{-1, 3, 1,-1, 1,-1,-3,-1, 1,-1, 1, 3},
{ 1,-3, 3,-1,-1, 1, 1,-1,-1, 3,-3, 1},
{-1, 3,-3,-3,-3, 3, 1,-1, 3, 3,-3, 1},
{-3,-1,-1,-1, 1,-3, 3,-1, 1,-3, 3, 1},
{ 1,-3, 3, 1,-1,-1,-1, 1, 1, 3,-1, 1},
{ 1,-3,-1, 3, 3,-1,-3, 1, 1, 1, 1, 1},
{-1, 3,-1, 1, 1,-3,-3,-1,-3,-3, 3,-1},
{ 3, 1,-1,-1, 3, 3,-3, 1, 3, 1, 3, 3},
{ 1,-3, 1, 1,-3, 1, 1, 1,-3,-3,-3, 1},
{ 3, 3,-3, 3,-3, 1, 1, 3,-1,-3, 3, 3},
{-3, 1,-1,-3,-1, 3, 1, 3, 3, 3,-1, 1},
{ 3,-1, 1,-3,-1,-1, 1, 1, 3, 1,-1,-3},
{ 1, 3, 1,-1, 1, 3, 3, 3,-1,-1, 3,-1},
{-3, 1, 1, 3,-3, 3,-3,-3, 3, 1, 3,-1},
{-3, 3, 1, 1,-3, 1,-3,-3,-1,-1, 1,-3},
{-1, 3, 1, 3, 1,-1,-1, 3,-3,-1,-3,-1},
{-1,-3, 1, 1, 1, 1, 3, 1,-1, 1,-3,-1},
{-1, 3,-1, 1,-3,-3,-3,-3,-3, 1,-1,-3},
{ 1, 1,-3,-3,-3,-3,-1, 3,-3, 1,-3, 3},
{ 1, 1,-1,-3,-1,-3, 1,-1, 1, 3,-1, 1},
{ 1, 1, 3, 1, 3, 3,-1, 1,-1,-3,-3, 1},
{ 1,-3, 3, 3, 1, 3, 3, 1,-3,-1,-1, 3},
{ 1, 3,-3,-3, 3,-3, 1,-1,-1, 3,-1,-3},
{-3,-1,-3,-1,-3, 3, 1,-1, 1, 3,-3,-3},
{-1, 3,-3, 3,-1, 3, 3,-3, 3, 3,-1,-1},
{ 3,-3,-3,-1,-1,-3,-1, 3,-3, 3, 1,-1}};
// Phi values for M_sc=24 Table 5.5.1.2-2 in 36.211
int phi_M_sc_24[30][24] = {{-1, 3, 1,-3, 3,-1, 1, 3,-3, 3, 1, 3,-3, 3, 1, 1,-1, 1, 3,-3, 3,-3,-1,-3},
{-3, 3,-3,-3,-3, 1,-3,-3, 3,-1, 1, 1, 1, 3, 1,-1, 3,-3,-3, 1, 3, 1, 1,-3},
{ 3,-1, 3, 3, 1, 1,-3, 3, 3, 3, 3, 1,-1, 3,-1, 1, 1,-1,-3,-1,-1, 1, 3, 3},
{-1,-3, 1, 1, 3,-3, 1, 1,-3,-1,-1, 1, 3, 1, 3, 1,-1, 3, 1, 1,-3,-1,-3,-1},
{-1,-1,-1,-3,-3,-1, 1, 1, 3, 3,-1, 3,-1, 1,-1,-3, 1,-1,-3,-3, 1,-3,-1,-1},
{-3, 1, 1, 3,-1, 1, 3, 1,-3, 1,-3, 1, 1,-1,-1, 3,-1,-3, 3,-3,-3,-3, 1, 1},
{ 1, 1,-1,-1, 3,-3,-3, 3,-3, 1,-1,-1, 1,-1, 1, 1,-1,-3,-1, 1,-1, 3,-1,-3},
{-3, 3, 3,-1,-1,-3,-1, 3, 1, 3, 1, 3, 1, 1,-1, 3, 1,-1, 1, 3,-3,-1,-1, 1},
{-3, 1, 3,-3, 1,-1,-3, 3,-3, 3,-1,-1,-1,-1, 1,-3,-3,-3, 1,-3,-3,-3, 1,-3},
{ 1, 1,-3, 3, 3,-1,-3,-1, 3,-3, 3, 3, 3,-1, 1, 1,-3, 1,-1, 1, 1,-3, 1, 1},
{-1, 1,-3,-3, 3,-1, 3,-1,-1,-3,-3,-3,-1,-3,-3, 1,-1, 1, 3, 3,-1, 1,-1, 3},
{ 1, 3, 3,-3,-3, 1, 3, 1,-1,-3,-3,-3, 3, 3,-3, 3, 3,-1,-3, 3,-1, 1,-3, 1},
{ 1, 3, 3, 1, 1, 1,-1,-1, 1,-3, 3,-1, 1, 1,-3, 3, 3,-1,-3, 3,-3,-1,-3,-1},
{ 3,-1,-1,-1,-1,-3,-1, 3, 3, 1,-1, 1, 3, 3, 3,-1, 1, 1,-3, 1, 3,-1,-3, 3},
{-3,-3, 3, 1, 3, 1,-3, 3, 1, 3, 1, 1, 3, 3,-1,-1,-3, 1,-3,-1, 3, 1, 1, 3},
{-1,-1, 1,-3, 1, 3,-3, 1,-1,-3,-1, 3, 1, 3, 1,-1,-3,-3,-1,-1,-3,-3,-3,-1},
{-1,-3, 3,-1,-1,-1,-1, 1, 1,-3, 3, 1, 3, 3, 1,-1, 1,-3, 1,-3, 1, 1,-3,-1},
{ 1, 3,-1, 3, 3,-1,-3, 1,-1,-3, 3, 3, 3,-1, 1, 1, 3,-1,-3,-1, 3,-1,-1,-1},
{ 1, 1, 1, 1, 1,-1, 3,-1,-3, 1, 1, 3,-3, 1,-3,-1, 1, 1,-3,-3, 3, 1, 1,-3},
{ 1, 3, 3, 1,-1,-3, 3,-1, 3, 3, 3,-3, 1,-1, 1,-1,-3,-1, 1, 3,-1, 3,-3,-3},
{-1,-3, 3,-3,-3,-3,-1,-1,-3,-1,-3, 3, 1, 3,-3,-1, 3,-1, 1,-1, 3,-3, 1,-1},
{-3,-3, 1, 1,-1, 1,-1, 1,-1, 3, 1,-3,-1, 1,-1, 1,-1,-1, 3, 3,-3,-1, 1,-3},
{-3,-1,-3, 3, 1,-1,-3,-1,-3,-3, 3,-3, 3,-3,-1, 1, 3, 1,-3, 1, 3, 3,-1,-3},
{-1,-1,-1,-1, 3, 3, 3, 1, 3, 3,-3, 1, 3,-1, 3,-1, 3, 3,-3, 3, 1,-1, 3, 3},
{ 1,-1, 3, 3,-1,-3, 3,-3,-1,-1, 3,-1, 3,-1,-1, 1, 1, 1, 1,-1,-1,-3,-1, 3},
{ 1,-1, 1,-1, 3,-1, 3, 1, 1,-1,-1,-3, 1, 1,-3, 1, 3,-3, 1, 1,-3,-3,-1,-1},
{-3,-1, 1, 3, 1, 1,-3,-1,-1,-3, 3,-3, 3, 1,-3, 3,-3, 1,-1, 1,-3, 1, 1, 1},
{-1,-3, 3, 3, 1, 1, 3,-1,-3,-1,-1,-1, 3, 1,-3,-3,-1, 3,-3,-1,-3,-1,-3,-1},
{-1,-3,-1,-1, 1,-3,-1,-1, 1,-1,-3, 1, 1,-3, 1,-3,-3, 3, 1, 1,-1, 3,-1,-1},
{ 1, 1,-1,-1,-3,-1, 3,-1, 3,-1, 1, 3, 1,-1, 3, 1, 3,-3,-3, 1,-1,-1, 1, 3}};
// Prime numbers used for Section 5.5.1.1 of 36.211
#define NOF_PRIME_NUMBERS 309
uint32_t prime_numbers[NOF_PRIME_NUMBERS] = { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
73, 79, 83, 89, 97, 101, 103, 107, 109, 113,
127, 131, 137, 139, 149, 151, 157, 163, 167, 173,
179, 181, 191, 193, 197, 199, 211, 223, 227, 229,
233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
283, 293, 307, 311, 313, 317, 331, 337, 347, 349,
353, 359, 367, 373, 379, 383, 389, 397, 401, 409,
419, 421, 431, 433, 439, 443, 449, 457, 461, 463,
467, 479, 487, 491, 499, 503, 509, 521, 523, 541,
547, 557, 563, 569, 571, 577, 587, 593, 599, 601,
607, 613, 617, 619, 631, 641, 643, 647, 653, 659,
661, 673, 677, 683, 691, 701, 709, 719, 727, 733,
739, 743, 751, 757, 761, 769, 773, 787, 797, 809,
811, 821, 823, 827, 829, 839, 853, 857, 859, 863,
877, 881, 883, 887, 907, 911, 919, 929, 937, 941,
947, 953, 967, 971, 977, 983, 991, 997,1009,1013,
1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,
1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,
1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,
1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,
1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,
1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,
1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,
1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,
1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,
1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,
1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,
1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,
1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,
1993,1997,1999,2003,2011,2017,2027,2029,2039};

23
lte/phy/lib/ch_estimation/test/CMakeLists.txt
Unescape Escape View File

@ -20,13 +20,26 @@
#
########################################################################
# Channel Estimation TEST
# Downlink Channel Estimation TEST
########################################################################
ADD_EXECUTABLE(chest_test chest_test.c)
TARGET_LINK_LIBRARIES(chest_test lte_phy)
ADD_EXECUTABLE(chest_test_dl chest_test_dl.c)
TARGET_LINK_LIBRARIES(chest_test_dl lte_phy)
ADD_TEST(chest_test_dl_cellid0 chest_dl_test -c 0)
ADD_TEST(chest_test_dl_cellid1 chest_dl_test -c 1)
ADD_TEST(chest_test_dl_cellid2 chest_dl_test -c 2)
########################################################################
# Uplink Channel Estimation TEST
########################################################################
ADD_EXECUTABLE(chest_test_ul chest_test_ul.c)
TARGET_LINK_LIBRARIES(chest_test_ul lte_phy)
#ADD_TEST(chest_test_ul_cellid0 chest_ul_test -c 0)
#ADD_TEST(chest_test_ul_cellid1 chest_ul_test -c 1)
#ADD_TEST(chest_test_ul_cellid2 chest_ul_test -c 2)
ADD_TEST(chest_test_all_cellids chest_test)
ADD_TEST(chest_test_cellid chest_test -c 1)

0
lte/phy/lib/ch_estimation/test/chest_test.c → lte/phy/lib/ch_estimation/test/chest_test_dl.c
Unescape Escape View File

249
lte/phy/lib/ch_estimation/test/chest_test_ul.c
Unescape Escape View File

@ -0,0 +1,249 @@
/**
*
* \section COPYRIGHT
*
* Copyright 2013-2014 The libLTE Developers. See the
* COPYRIGHT file at the top-level directory of this distribution.
*
* \section LICENSE
*
* This file is part of the libLTE library.
*
* libLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* libLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* A copy of the GNU Lesser General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <complex.h>
#include "liblte/phy/phy.h"
lte_cell_t cell = {
6, // nof_prb
MAX_PORTS, // nof_ports
1000, // cell_id
CPNORM // cyclic prefix
};
char *output_matlab = NULL;
void usage(char *prog) {
printf("Usage: %s [recov]\n", prog);
printf("\t-r nof_prb [Default %d]\n", cell.nof_prb);
printf("\t-e extended cyclic prefix [Default normal]\n");
printf("\t-c cell_id (1000 tests all). [Default %d]\n", cell.id);
printf("\t-o output matlab file [Default %s]\n",output_matlab?output_matlab:"None");
printf("\t-v increase verbosity\n");
}
void parse_args(int argc, char **argv) {
int opt;
while ((opt = getopt(argc, argv, "recov")) != -1) {
switch(opt) {
case 'r':
cell.nof_prb = atoi(argv[optind]);
break;
case 'e':
cell.cp = CPEXT;
break;
case 'c':
cell.id = atoi(argv[optind]);
break;
case 'o':
output_matlab = argv[optind];
break;
case 'v':
verbose++;
break;
default:
usage(argv[0]);
exit(-1);
}
}
}
int check_mse(float mod, float arg, int n_port) {
INFO("mod=%.4f, arg=%.4f, n_port=%d\n", mod, arg, n_port);
switch(n_port) {
case 0:
if (mod > 0.029) {
return -1;
}
if (arg > 0.029) {
return -1;
}
break;
case 1:
if (mod > 0.012) {
return -1;
}
if (arg > 0.012) {
return -1;
}
break;
case 2:
case 3:
if (mod > 3.33) {
return -1;
}
if (arg > 0.63) {
return -1;
}
break;
default:
return -1;
}
return 0;
}
int main(int argc, char **argv) {
chest_t eq;
cf_t *input = NULL, *ce = NULL, *h = NULL;
refsignal_t refs;
int i, j, n_port, n_slot, cid, num_re;
int ret = -1;
int max_cid;
FILE *fmatlab = NULL;
float mse_mag, mse_phase;
parse_args(argc,argv);
if (output_matlab) {
fmatlab=fopen(output_matlab, "w");
if (!fmatlab) {
perror("fopen");
goto do_exit;
}
}
num_re = cell.nof_prb * RE_X_RB * CP_NSYMB(cell.cp);
input = malloc(num_re * sizeof(cf_t));
if (!input) {
perror("malloc");
goto do_exit;
}
h = malloc(num_re * sizeof(cf_t));
if (!h) {
perror("malloc");
goto do_exit;
}
ce = malloc(num_re * sizeof(cf_t));
if (!ce) {
perror("malloc");
goto do_exit;
}
if (cell.id == 1000) {
cid = 0;
max_cid = 504;
} else {
cid = cell.id;
max_cid = cell.id;
}
while(cid <= max_cid) {
cell.id = cid;
if (chest_init_LTEUL(&eq, cell)) {
fprintf(stderr, "Error initializing equalizer\n");
goto do_exit;
}
for (n_slot=0;n_slot<NSLOTS_X_FRAME;n_slot++) {
for (n_port=0;n_port<cell.nof_ports;n_port++) {
if (refsignal_init_LTEDL(&refs, n_port, n_slot, cell)) {
fprintf(stderr, "Error initiating CRS slot=%d\n", i);
return -1;
}
bzero(input, sizeof(cf_t) * num_re);
for (i=0;i<num_re;i++) {
input[i] = 0.5-rand()/RAND_MAX+I*(0.5-rand()/RAND_MAX);
}
bzero(ce, sizeof(cf_t) * num_re);
bzero(h, sizeof(cf_t) * num_re);
refsignal_put(&refs, input);
for (i=0;i<CP_NSYMB(cell.cp);i++) {
for (j=0;j<cell.nof_prb * RE_X_RB;j++) {
float x = -1+(float) i/CP_NSYMB(cell.cp) + cosf(2 * M_PI * (float) j/cell.nof_prb/RE_X_RB);
h[i*cell.nof_prb * RE_X_RB+j] = (3+x) * cexpf(I * x);
input[i*cell.nof_prb * RE_X_RB+j] *= h[i*cell.nof_prb * RE_X_RB+j];
}
}
chest_ce_slot_port(&eq, input, ce, n_slot, n_port);
mse_mag = mse_phase = 0;
for (i=0;i<num_re;i++) {
mse_mag += (cabsf(h[i]) - cabsf(ce[i])) * (cabsf(h[i]) - cabsf(ce[i])) / num_re;
mse_phase += (cargf(h[i]) - cargf(ce[i])) * (cargf(h[i]) - cargf(ce[i])) / num_re;
}
if (check_mse(mse_mag, mse_phase, n_port)) {
goto do_exit;
}
if (fmatlab) {
fprintf(fmatlab, "input=");
vec_fprint_c(fmatlab, input, num_re);
fprintf(fmatlab, ";\n");
fprintf(fmatlab, "h=");
vec_fprint_c(fmatlab, h, num_re);
fprintf(fmatlab, ";\n");
fprintf(fmatlab, "ce=");
vec_fprint_c(fmatlab, ce, num_re);
fprintf(fmatlab, ";\n");
chest_fprint(&eq, fmatlab, n_slot, n_port);
}
}
}
chest_free(&eq);
cid+=10;
INFO("cid=%d\n", cid);
}
ret = 0;
do_exit:
if (ce) {
free(ce);
}
if (input) {
free(input);
}
if (h) {
free(h);
}
if (!ret) {
printf("OK\n");
} else {
printf("Error at cid=%d, slot=%d, port=%d\n",cid, n_slot, n_port);
}
exit(ret);
}

7
lte/phy/lib/common/src/sequence.c
Unescape Escape View File

@ -25,14 +25,13 @@
*
*/
#include "liblte/phy/common/sequence.h"
#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <assert.h>
#include "liblte/phy/common/sequence.h"
#define Nc 1600
@ -75,7 +74,7 @@ void generate_prs_c(sequence_t *q, uint32_t seed) {
free(x2);
}
int sequence_LTEPRS(sequence_t *q, uint32_t len, uint32_t seed) {
int sequence_LTE_pr(sequence_t *q, uint32_t len, uint32_t seed) {
if (sequence_init(q, len)) {
return LIBLTE_ERROR;
}

10
lte/phy/lib/phch/src/sequences.c
Unescape Escape View File

@ -35,7 +35,7 @@
*/
int sequence_pbch(sequence_t *seq, lte_cp_t cp, uint32_t cell_id) {
bzero(seq, sizeof(sequence_t));
return sequence_LTEPRS(seq, CP_ISNORM(cp)?1920:1728, cell_id);
return sequence_LTE_pr(seq, CP_ISNORM(cp)?1920:1728, cell_id);
}
/**
@ -43,7 +43,7 @@ int sequence_pbch(sequence_t *seq, lte_cp_t cp, uint32_t cell_id) {
*/
int sequence_pcfich(sequence_t *seq, uint32_t nslot, uint32_t cell_id) {
bzero(seq, sizeof(sequence_t));
return sequence_LTEPRS(seq, 32, (nslot/2+1) * (2*cell_id + 1) * 512 + cell_id);
return sequence_LTE_pr(seq, 32, (nslot/2+1) * (2*cell_id + 1) * 512 + cell_id);
}
@ -52,7 +52,7 @@ int sequence_pcfich(sequence_t *seq, uint32_t nslot, uint32_t cell_id) {
*/
int sequence_phich(sequence_t *seq, uint32_t nslot, uint32_t cell_id) {
bzero(seq, sizeof(sequence_t));
return sequence_LTEPRS(seq, 12, (nslot/2+1) * (2*cell_id + 1) * 512 + cell_id);
return sequence_LTE_pr(seq, 12, (nslot/2+1) * (2*cell_id + 1) * 512 + cell_id);
}
/**
@ -60,7 +60,7 @@ int sequence_phich(sequence_t *seq, uint32_t nslot, uint32_t cell_id) {
*/
int sequence_pdcch(sequence_t *seq, uint32_t nslot, uint32_t cell_id, uint32_t len) {
bzero(seq, sizeof(sequence_t));
return sequence_LTEPRS(seq, len, (nslot/2) * 512 + cell_id);
return sequence_LTE_pr(seq, len, (nslot/2) * 512 + cell_id);
}
/**
@ -68,5 +68,5 @@ int sequence_pdcch(sequence_t *seq, uint32_t nslot, uint32_t cell_id, uint32_t l
*/
int sequence_pdsch(sequence_t *seq, unsigned short rnti, int q, uint32_t nslot, uint32_t cell_id, uint32_t len) {
bzero(seq, sizeof(sequence_t));
return sequence_LTEPRS(seq, len, (rnti<<14) + (q<<13) + ((nslot/2)<<9) + cell_id);
return sequence_LTE_pr(seq, len, (rnti<<14) + (q<<13) + ((nslot/2)<<9) + cell_id);
}

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