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@ -25,7 +25,7 @@
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <complex.h>
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#include <string.h>
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@ -35,47 +35,144 @@
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#include "liblte/phy/mimo/precoding.h"
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#include "liblte/phy/utils/vector.h"
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int precoding_single(cf_t *x, cf_t *y, int nof_symbols) {
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memcpy(y, x, nof_symbols * sizeof(cf_t));
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return nof_symbols;
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/************************************************
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*
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* RECEIVER SIDE FUNCTIONS
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*
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**************************************************/
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int precoding_init(precoding_t *q, uint32_t max_frame_len) {
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if (q) {
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bzero(q, sizeof(precoding_t));
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q->h_mod = vec_malloc(sizeof(cf_t) * max_frame_len);
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if (!q->h_mod) {
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perror("malloc");
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goto clean_exit;
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}
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q->y_mod = vec_malloc(sizeof(float) * max_frame_len);
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if (!q->y_mod) {
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perror("malloc");
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goto clean_exit;
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}
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q->z_real = vec_malloc(sizeof(float) * max_frame_len);
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if (!q->z_real) {
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perror("malloc");
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goto clean_exit;
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}
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q->z_imag = vec_malloc(sizeof(float) * max_frame_len);
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if (!q->z_imag) {
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perror("malloc");
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goto clean_exit;
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}
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q->max_frame_len = max_frame_len;
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return LIBLTE_SUCCESS;
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} else {
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return LIBLTE_ERROR_INVALID_INPUTS;
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}
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clean_exit:
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precoding_free(q);
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return LIBLTE_ERROR;
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}
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int precoding_diversity(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_ports,
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int nof_symbols) {
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void precoding_free(precoding_t *q) {
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if (q->h_mod) {
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free(q->h_mod);
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}
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if (q->y_mod) {
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free(q->y_mod);
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}
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if (q->z_real) {
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free(q->z_real);
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}
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if (q->z_imag) {
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free(q->z_imag);
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}
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bzero(q, sizeof(precoding_t));
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}
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/* ZF SISO equalizer: x=y/h */
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int predecoding_single_zf(precoding_t *q, cf_t *y, cf_t *h, cf_t *x, int nof_symbols) {
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if (nof_symbols <= q->max_frame_len) {
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vec_div_ccc(y, h, q->y_mod, x, q->z_real, q->z_imag, nof_symbols);
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return nof_symbols;
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} else {
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return LIBLTE_ERROR;
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}
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}
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/* MMSE SISO equalizer x=y*h'/(h*h'+no) */
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int predecoding_single_mmse(precoding_t *q, cf_t *y, cf_t *h, cf_t *x, int nof_symbols, float noise_estimate) {
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if (nof_symbols <= q->max_frame_len) {
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// h*h'
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vec_prod_conj_ccc(h, h, q->h_mod, nof_symbols);
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// real(h*h')
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vec_deinterleave_real_cf(q->h_mod, q->y_mod, nof_symbols);
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// (h*h' + n0)
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vec_sc_add_fff(q->y_mod, noise_estimate, q->y_mod, nof_symbols);
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// y*h'
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vec_prod_conj_ccc(y, h, x, nof_symbols);
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// decompose real/imag parts
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vec_deinterleave_cf(x, q->z_real, q->z_imag, nof_symbols);
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// real and imag division
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vec_div_fff(q->z_real, q->y_mod, q->z_real, nof_symbols);
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vec_div_fff(q->z_imag, q->y_mod, q->z_imag, nof_symbols);
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// interleave again
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vec_interleave_cf(q->z_real, q->z_imag, x, nof_symbols);
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return nof_symbols;
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} else {
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return LIBLTE_ERROR;
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}
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}
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/* ZF STBC equalizer */
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int predecoding_diversity_zf(precoding_t *q, cf_t *y, cf_t *h[MAX_PORTS], cf_t *x[MAX_LAYERS],
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int nof_ports, int nof_symbols) {
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int i;
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cf_t h0, h1, h2, h3, r0, r1, r2, r3;
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float hh, hh02, hh13;
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if (nof_ports == 2) {
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/* FIXME: Use VOLK here */
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for (i = 0; i < nof_symbols; i++) {
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y[0][2 * i] = x[0][i] / sqrtf(2);
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y[1][2 * i] = -conjf(x[1][i]) / sqrtf(2);
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y[0][2 * i + 1] = x[1][i] / sqrtf(2);
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y[1][2 * i + 1] = conjf(x[0][i]) / sqrtf(2);
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/* TODO: Use VOLK here */
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for (i = 0; i < nof_symbols / 2; i++) {
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h0 = h[0][2 * i];
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h1 = h[1][2 * i];
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hh = crealf(h0) * crealf(h0) + cimagf(h0) * cimagf(h0)
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+ crealf(h1) * crealf(h1) + cimagf(h1) * cimagf(h1);
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r0 = y[2 * i];
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r1 = y[2 * i + 1];
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if (hh == 0) {
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hh = 1e-2;
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}
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x[0][i] = (conjf(h0) * r0 + h1 * conjf(r1)) / hh * sqrt(2);
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x[1][i] = (-h1 * conj(r0) + conj(h0) * r1) / hh * sqrt(2);
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}
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return 2 * i;
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return i;
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} else if (nof_ports == 4) {
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//int m_ap = (nof_symbols%4)?(nof_symbols*4-2):nof_symbols*4;
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int m_ap = 4 * nof_symbols;
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for (i = 0; i < m_ap / 4; i++) {
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y[0][4 * i] = x[0][i] / sqrtf(2);
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y[1][4 * i] = 0;
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y[2][4 * i] = -conjf(x[1][i]) / sqrtf(2);
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y[3][4 * i] = 0;
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y[0][4 * i + 1] = x[1][i] / sqrtf(2);
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y[1][4 * i + 1] = 0;
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y[2][4 * i + 1] = conjf(x[0][i]) / sqrtf(2);
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y[3][4 * i + 1] = 0;
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int m_ap = (nof_symbols % 4) ? ((nof_symbols - 2) / 4) : nof_symbols / 4;
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for (i = 0; i < m_ap; i++) {
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h0 = h[0][4 * i];
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h1 = h[1][4 * i + 2];
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h2 = h[2][4 * i];
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h3 = h[3][4 * i + 2];
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hh02 = crealf(h0) * crealf(h0) + cimagf(h0) * cimagf(h0)
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+ crealf(h2) * crealf(h2) + cimagf(h2) * cimagf(h2);
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hh13 = crealf(h1) * crealf(h1) + cimagf(h1) * cimagf(h1)
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+ crealf(h3) * crealf(h3) + cimagf(h3) * cimagf(h3);
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r0 = y[4 * i];
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r1 = y[4 * i + 1];
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r2 = y[4 * i + 2];
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r3 = y[4 * i + 3];
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y[0][4 * i + 2] = 0;
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y[1][4 * i + 2] = x[2][i] / sqrtf(2);
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y[2][4 * i + 2] = 0;
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y[3][4 * i + 2] = -conjf(x[3][i]) / sqrtf(2);
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x[0][i] = (conjf(h0) * r0 + h2 * conjf(r1)) / hh02 * sqrt(2);
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x[1][i] = (-h2 * conjf(r0) + conjf(h0) * r1) / hh02 * sqrt(2);
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x[2][i] = (conjf(h1) * r2 + h3 * conjf(r3)) / hh13 * sqrt(2);
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x[3][i] = (-h3 * conjf(r2) + conjf(h1) * r3) / hh13 * sqrt(2);
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y[0][4 * i + 3] = 0;
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y[1][4 * i + 3] = x[3][i] / sqrtf(2);
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y[2][4 * i + 3] = 0;
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y[3][4 * i + 3] = conjf(x[2][i]) / sqrtf(2);
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}
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return 4 * i;
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return i;
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} else {
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fprintf(stderr, "Number of ports must be 2 or 4 for transmit diversity (nof_ports=%d)\n", nof_ports);
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return -1;
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@ -83,8 +180,8 @@ int precoding_diversity(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_ports,
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}
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/* 36.211 v10.3.0 Section 6.3.4 */
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int precoding_type(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_layers,
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int nof_ports, int nof_symbols, lte_mimo_type_t type) {
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int predecoding_type(precoding_t *q, cf_t *y, cf_t *h[MAX_PORTS], cf_t *x[MAX_LAYERS],
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int nof_ports, int nof_layers, int nof_symbols, lte_mimo_type_t type) {
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if (nof_ports > MAX_PORTS) {
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fprintf(stderr, "Maximum number of ports is %d (nof_ports=%d)\n", MAX_PORTS,
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@ -100,7 +197,7 @@ int precoding_type(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_layers,
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switch (type) {
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case SINGLE_ANTENNA:
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if (nof_ports == 1 && nof_layers == 1) {
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return precoding_single(x[0], y[0], nof_symbols);
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return predecoding_single_zf(q, y, h[0], x[0], nof_symbols);
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} else {
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fprintf(stderr,
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"Number of ports and layers must be 1 for transmission on single antenna ports\n");
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@ -109,12 +206,13 @@ int precoding_type(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_layers,
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break;
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case TX_DIVERSITY:
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if (nof_ports == nof_layers) {
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return precoding_diversity(x, y, nof_ports, nof_symbols);
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return predecoding_diversity_zf(q, y, h, x, nof_ports, nof_symbols);
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} else {
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fprintf(stderr,
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"Error number of layers must equal number of ports in transmit diversity\n");
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return -1;
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}
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break;
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case SPATIAL_MULTIPLEX:
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fprintf(stderr, "Spatial multiplexing not supported\n");
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return -1;
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@ -123,65 +221,57 @@ int precoding_type(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_layers,
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}
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float y_mod[110*12*14];
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/* ZF detector */
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int predecoding_single_zf(cf_t *y, cf_t *ce, cf_t *x, int nof_symbols) {
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for (int i=0;i<nof_symbols;i++) {
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if (ce[i] == 0) {
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ce[i] = 0.01;
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}
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}
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vec_div_ccc(y, ce, y_mod, x, nof_symbols);
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/************************************************
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*
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* TRANSMITTER SIDE FUNCTIONS
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*
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**************************************************/
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int precoding_single(precoding_t *q, cf_t *x, cf_t *y, int nof_symbols) {
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memcpy(y, x, nof_symbols * sizeof(cf_t));
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return nof_symbols;
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}
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/* ZF detector */
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int predecoding_diversity_zf(cf_t *y, cf_t *ce[MAX_PORTS], cf_t *x[MAX_LAYERS],
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int nof_ports, int nof_symbols) {
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int precoding_diversity(precoding_t *q, cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_ports,
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int nof_symbols) {
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int i;
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cf_t h0, h1, h2, h3, r0, r1, r2, r3;
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float hh, hh02, hh13;
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if (nof_ports == 2) {
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/* TODO: Use VOLK here */
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for (i = 0; i < nof_symbols / 2; i++) {
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h0 = ce[0][2 * i];
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h1 = ce[1][2 * i];
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hh = crealf(h0) * crealf(h0) + cimagf(h0) * cimagf(h0)
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+ crealf(h1) * crealf(h1) + cimagf(h1) * cimagf(h1);
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r0 = y[2 * i];
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r1 = y[2 * i + 1];
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if (hh == 0) {
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hh = 1e-2;
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}
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x[0][i] = (conjf(h0) * r0 + h1 * conjf(r1)) / hh * sqrt(2);
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x[1][i] = (-h1 * conj(r0) + conj(h0) * r1) / hh * sqrt(2);
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/* FIXME: Use VOLK here */
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for (i = 0; i < nof_symbols; i++) {
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y[0][2 * i] = x[0][i] / sqrtf(2);
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y[1][2 * i] = -conjf(x[1][i]) / sqrtf(2);
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y[0][2 * i + 1] = x[1][i] / sqrtf(2);
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y[1][2 * i + 1] = conjf(x[0][i]) / sqrtf(2);
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}
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return i;
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return 2 * i;
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} else if (nof_ports == 4) {
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//int m_ap = (nof_symbols%4)?(nof_symbols*4-2):nof_symbols*4;
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int m_ap = 4 * nof_symbols;
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for (i = 0; i < m_ap / 4; i++) {
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y[0][4 * i] = x[0][i] / sqrtf(2);
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y[1][4 * i] = 0;
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y[2][4 * i] = -conjf(x[1][i]) / sqrtf(2);
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y[3][4 * i] = 0;
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int m_ap = (nof_symbols % 4) ? ((nof_symbols - 2) / 4) : nof_symbols / 4;
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for (i = 0; i < m_ap; i++) {
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h0 = ce[0][4 * i];
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h1 = ce[1][4 * i + 2];
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h2 = ce[2][4 * i];
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h3 = ce[3][4 * i + 2];
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hh02 = crealf(h0) * crealf(h0) + cimagf(h0) * cimagf(h0)
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+ crealf(h2) * crealf(h2) + cimagf(h2) * cimagf(h2);
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hh13 = crealf(h1) * crealf(h1) + cimagf(h1) * cimagf(h1)
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+ crealf(h3) * crealf(h3) + cimagf(h3) * cimagf(h3);
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r0 = y[4 * i];
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r1 = y[4 * i + 1];
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r2 = y[4 * i + 2];
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r3 = y[4 * i + 3];
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y[0][4 * i + 1] = x[1][i] / sqrtf(2);
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y[1][4 * i + 1] = 0;
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|
y[2][4 * i + 1] = conjf(x[0][i]) / sqrtf(2);
|
|
|
|
|
y[3][4 * i + 1] = 0;
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|
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x[0][i] = (conjf(h0) * r0 + h2 * conjf(r1)) / hh02 * sqrt(2);
|
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|
|
|
x[1][i] = (-h2 * conjf(r0) + conjf(h0) * r1) / hh02 * sqrt(2);
|
|
|
|
|
x[2][i] = (conjf(h1) * r2 + h3 * conjf(r3)) / hh13 * sqrt(2);
|
|
|
|
|
x[3][i] = (-h3 * conjf(r2) + conjf(h1) * r3) / hh13 * sqrt(2);
|
|
|
|
|
y[0][4 * i + 2] = 0;
|
|
|
|
|
y[1][4 * i + 2] = x[2][i] / sqrtf(2);
|
|
|
|
|
y[2][4 * i + 2] = 0;
|
|
|
|
|
y[3][4 * i + 2] = -conjf(x[3][i]) / sqrtf(2);
|
|
|
|
|
|
|
|
|
|
y[0][4 * i + 3] = 0;
|
|
|
|
|
y[1][4 * i + 3] = x[3][i] / sqrtf(2);
|
|
|
|
|
y[2][4 * i + 3] = 0;
|
|
|
|
|
y[3][4 * i + 3] = conjf(x[2][i]) / sqrtf(2);
|
|
|
|
|
}
|
|
|
|
|
return i;
|
|
|
|
|
return 4 * i;
|
|
|
|
|
} else {
|
|
|
|
|
fprintf(stderr, "Number of ports must be 2 or 4 for transmit diversity (nof_ports=%d)\n", nof_ports);
|
|
|
|
|
return -1;
|
|
|
|
|
@ -189,8 +279,8 @@ int predecoding_diversity_zf(cf_t *y, cf_t *ce[MAX_PORTS], cf_t *x[MAX_LAYERS],
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* 36.211 v10.3.0 Section 6.3.4 */
|
|
|
|
|
int predecoding_type(cf_t *y, cf_t *ce[MAX_PORTS], cf_t *x[MAX_LAYERS],
|
|
|
|
|
int nof_ports, int nof_layers, int nof_symbols, lte_mimo_type_t type) {
|
|
|
|
|
int precoding_type(precoding_t *q, cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_layers,
|
|
|
|
|
int nof_ports, int nof_symbols, lte_mimo_type_t type) {
|
|
|
|
|
|
|
|
|
|
if (nof_ports > MAX_PORTS) {
|
|
|
|
|
fprintf(stderr, "Maximum number of ports is %d (nof_ports=%d)\n", MAX_PORTS,
|
|
|
|
|
@ -206,7 +296,7 @@ int predecoding_type(cf_t *y, cf_t *ce[MAX_PORTS], cf_t *x[MAX_LAYERS],
|
|
|
|
|
switch (type) {
|
|
|
|
|
case SINGLE_ANTENNA:
|
|
|
|
|
if (nof_ports == 1 && nof_layers == 1) {
|
|
|
|
|
return predecoding_single_zf(y, ce[0], x[0], nof_symbols);
|
|
|
|
|
return precoding_single(q, x[0], y[0], nof_symbols);
|
|
|
|
|
} else {
|
|
|
|
|
fprintf(stderr,
|
|
|
|
|
"Number of ports and layers must be 1 for transmission on single antenna ports\n");
|
|
|
|
|
@ -215,13 +305,12 @@ int predecoding_type(cf_t *y, cf_t *ce[MAX_PORTS], cf_t *x[MAX_LAYERS],
|
|
|
|
|
break;
|
|
|
|
|
case TX_DIVERSITY:
|
|
|
|
|
if (nof_ports == nof_layers) {
|
|
|
|
|
return predecoding_diversity_zf(y, ce, x, nof_ports, nof_symbols);
|
|
|
|
|
return precoding_diversity(q, x, y, nof_ports, nof_symbols);
|
|
|
|
|
} else {
|
|
|
|
|
fprintf(stderr,
|
|
|
|
|
"Error number of layers must equal number of ports in transmit diversity\n");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case SPATIAL_MULTIPLEX:
|
|
|
|
|
fprintf(stderr, "Spatial multiplexing not supported\n");
|
|
|
|
|
return -1;
|
|
|
|
|
|
ismagom
10 years ago