mirror of https://github.com/pvnis/srsRAN_4G.git
Added PSS mex test
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48da6746cd
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/*
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* Copyright (c) 2012, Ismael Gomez-Miguelez <ismael.gomez@tsc.upc.edu>.
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* This file is part of ALOE++ (http://flexnets.upc.edu/)
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*
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* ALOE++ 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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ALOE++ 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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* You should have received a copy of the GNU Lesser General Public License
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* along with ALOE++. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "liblte/phy/phy.h"
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#include "liblte/mex/mexutils.h"
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/** MEX function to be called from MATLAB to test the channel estimator
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*/
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#define ENBCFG prhs[0]
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#define INPUT prhs[1]
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#define NOF_INPUTS 2
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void help()
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{
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mexErrMsgTxt
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("[offset,corr] = liblte_pss(enbConfig, inputSignal)\n\n");
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}
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/* the gateway function */
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void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
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{
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int i;
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lte_cell_t cell;
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pss_synch_t pss;
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cf_t *input_symbols;
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int frame_len;
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if (nrhs != NOF_INPUTS) {
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help();
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return;
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}
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if (mexutils_read_cell(ENBCFG, &cell)) {
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help();
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return;
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}
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/** Allocate input buffers */
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frame_len = mexutils_read_cf(INPUT, &input_symbols);
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if (frame_len < 0) {
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mexErrMsgTxt("Error reading input symbols\n");
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return;
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}
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if (pss_synch_init_fft(&pss, frame_len, lte_symbol_sz(cell.nof_prb))) {
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fprintf(stderr, "Error initiating PSS\n");
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exit(-1);
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}
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if (pss_synch_set_N_id_2(&pss, cell.id%2)) {
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fprintf(stderr, "Error setting N_id_2=%d\n",cell.id%2);
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exit(-1);
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}
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int peak_idx = pss_synch_find_pss(&pss, input_symbols, NULL);
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if (nlhs >= 1) {
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plhs[0] = mxCreateLogicalScalar(peak_idx);
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}
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if (nlhs >= 2) {
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mexutils_write_cf(pss.conv_output, &plhs[1], frame_len, 1);
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}
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pss_synch_free(&pss);
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free(input_symbols);
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return;
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}
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@ -1,32 +1,44 @@
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enb = lteTestModel('1.1','5MHz');
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enb = lteTestModel('1.1','5MHz');
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Ntrials = 1;
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Ntrials = 1;
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SNR_values =-10;%linspace(-18,-10,8);
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SNR_values =-20;%linspace(-18,-10,8);
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tx_offset = randi(50,Ntrials,1);
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tx_offset = randi(50,Ntrials,1);
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tx_offset = 50;
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diff=zeros(size(SNR_values));
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diff=zeros(size(SNR_values));
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diff_lt=zeros(size(SNR_values));
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tx_signal = lteTestModelTool(enb);
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tx_signal = lteTestModelTool(enb);
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tx_power = mean(tx_signal.*conj(tx_signal));
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tx_power = mean(tx_signal.*conj(tx_signal));
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corrcfg.PSS='On';
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corrcfg.SSS='On';
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corrcfg.CellRS='Off';
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addpath('../../debug/lte/phy/lib/sync/test')
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for snr_idx=1:length(SNR_values)
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for snr_idx=1:length(SNR_values)
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SNRdB = SNR_values(snr_idx);
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SNRdB = SNR_values(snr_idx);
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rx_offset = zeros(size(tx_offset));
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rx_offset = zeros(size(tx_offset));
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rx_offset_lt = zeros(size(tx_offset));
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for i=1:Ntrials
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for i=1:Ntrials
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SNR = 10^(SNRdB/10); % Linear SNR
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SNR = 10^(SNRdB/10); % Linear SNR
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tx = [zeros(tx_offset(i),1); tx_signal];
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tx = [zeros(tx_offset(i),1); tx_signal];
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N0 = tx_power/(sqrt(2.0)*SNR);
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N0 = tx_power/(sqrt(2.0)*SNR);
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noise = N0*complex(randn(size(tx)), randn(size(tx))); % Generate noise
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noise = N0*complex(randn(size(tx)), randn(size(tx))); % Generate noise
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rx=noise+tx;
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rx=noise+tx;
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[rx_offset(i),corr] = lteDLFrameOffset(enb,rx);
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[rx_offset(i),corr] = lteDLFrameOffset(enb,rx,corrcfg);
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[rx_offset_lt(i),corr_lt] = liblte_pss(enb,rx);
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end
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end
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diff(snr_idx)=sum(abs(rx_offset-tx_offset));
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diff(snr_idx)=sum(abs(rx_offset-tx_offset));
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diff_lt(snr_idx)=sum(abs(rx_offset_lt-tx_offset));
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disp(SNRdB)
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disp(SNRdB)
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end
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end
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if (Ntrials == 1)
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if (Ntrials == 1)
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plot(corr)
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len=1:length(corr)-rx_offset(i)-3840;
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len2=rx_offset(i)+1+3840:length(corr);
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plot(len,corr(len)/max(corr(len)),...
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len,abs(corr_lt(len2))/max(abs(corr_lt(len2))));
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else
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else
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plot(SNR_values,diff);
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plot(SNR_values,diff,SNR_values,diff_lt);
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end
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end
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