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87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
11 years ago
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the libLTE library.
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*
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* libLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* libLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* A copy of the GNU Lesser General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdio.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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#include "lte/common/base.h"
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#include "lte/mimo/precoding.h"
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#include "lte/utils/vector.h"
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/* 36.211 v10.3.0 Section 6.3.4 */
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void precoding_decode(cf_t *y[MAX_PORTS], cf_t *ce[MAX_PORTS],
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cf_t *x[MAX_LAYERS], int nof_ports, int nof_symbols, mimo_type_t type) {
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int i;
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cf_t h0, h1, r0, r1;
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float hh;
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switch(nof_ports) {
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case 1:
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vec_div_ccc(y[0], ce[0], x[0], nof_symbols);
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break;
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case 2:
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switch(type) {
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case TX_DIVERSITY:
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/* FIXME: Use VOLK here */
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// 6.3.4.3
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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 = cabs(h0)*cabs(h0)+cabs(h1)*cabs(h1);
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r0 = y[0][2*i];
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r1 = y[0][2*i+1];
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x[0][i] = (conj(h0)*r0 + h1*conj(r1))/hh;
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x[1][i] = (h0*conj(r1) - h1*conj(r0))/hh;
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}
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break;
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default:
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printf("Error: Unsupported transmit mode\n");
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}
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break;
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default:
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printf("Error: Unsupported nof_ports=%d\n", nof_ports);
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return;
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}
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}
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void precoding_encode(cf_t *x[MAX_LAYERS], cf_t *y[MAX_PORTS], int nof_ports, int nof_symbols,
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mimo_type_t type) {
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switch(nof_ports) {
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case 1:
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memcpy(y[0], x[0], nof_symbols * sizeof(cf_t));
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break;
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default:
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printf("Error: Unsupported nof_ports=%d\n", nof_ports);
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return;
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}
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}
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