mirror of https://github.com/pvnis/srsRAN_4G.git
Fixed issue in PRACH generation. Added Matlab test
ismagom
10 years ago
parent
58ccecc8d7
commit
f8d48961ef
@ -0,0 +1,112 @@
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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 <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 UECFG prhs[0]
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#define PRACHCFG 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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("waveform = liblte_prach(ueConfig, prachConfig)\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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if (nrhs != NOF_INPUTS) {
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help();
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return;
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}
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uint32_t n_ul_rb = 0;
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if (mexutils_read_uint32_struct(UECFG, "NULRB", &n_ul_rb)) {
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mexErrMsgTxt("Field NULRB not found in UE config\n");
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return;
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}
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int r = lte_symbol_sz(n_ul_rb);
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if (r < 0) {
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mexErrMsgTxt("Invalid NULRB\n");
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return;
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}
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uint32_t N_ifft_ul = (uint32_t) r;
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uint32_t sf_idx = 0;
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mexutils_read_uint32_struct(UECFG, "NSubframe", &sf_idx);
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uint32_t nframe = 0;
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mexutils_read_uint32_struct(UECFG, "NFrame", &nframe);
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uint32_t preamble_format = 0;
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mexutils_read_uint32_struct(PRACHCFG, "Format", &preamble_format);
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uint32_t root_seq_idx = 0;
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mexutils_read_uint32_struct(PRACHCFG, "SeqIdx", &root_seq_idx);
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uint32_t seq_idx = 0;
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mexutils_read_uint32_struct(PRACHCFG, "PreambleIdx", &seq_idx);
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uint32_t zero_corr_zone = 0;
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mexutils_read_uint32_struct(PRACHCFG, "CyclicShiftIdx", &zero_corr_zone);
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uint32_t high_speed_flag = 0;
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mexutils_read_uint32_struct(PRACHCFG, "HighSpeed", &high_speed_flag);
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uint32_t timing_offset = 0;
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mexutils_read_uint32_struct(PRACHCFG, "TimingOffset", &timing_offset);
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uint32_t frequency_offset = 0;
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mexutils_read_uint32_struct(PRACHCFG, "FreqOffset", &frequency_offset);
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prach_t prach;
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if (prach_init(&prach, N_ifft_ul, preamble_format, root_seq_idx, high_speed_flag, zero_corr_zone)) {
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mexErrMsgTxt("Error initiating PRACH\n");
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return;
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}
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uint32_t nof_samples = lte_sampling_freq_hz(n_ul_rb) * 0.001;
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cf_t *signal = vec_malloc(sizeof(cf_t) * nof_samples);
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if (!signal) {
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mexErrMsgTxt("malloc");
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return;
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}
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bzero(signal, sizeof(cf_t) * nof_samples);
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if (prach_gen(&prach, seq_idx, frequency_offset, signal)) {
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mexErrMsgTxt("Error generating PRACH\n");
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return;
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}
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if (nlhs >= 0) {
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mexutils_write_cf(signal, &plhs[0], nof_samples, 1);
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}
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return;
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}
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Binary file not shown.
@ -0,0 +1,48 @@
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clear
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ueConfig=struct('NULRB',6,'DuplexMode','FDD','CyclicPrefix','Normal');
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prachConfig=struct('Format',0,'SeqIdx',0,'PreambleIdx',0,'CyclicShiftIdx',0,'HighSpeed',0,'TimingOffset',0,'FreqIdx',0,'FreqOffset',0);
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addpath('../../debug/lte/phy/lib/phch/test')
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NULRB=[6 15 25 50 100];
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% FreqIdx, FreqOffset and TimeOffset need to be tested
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for n_rb=1:length(NULRB)
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for format=0:3
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for seqIdx=0:837
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fprintf('format %d, seqIdx: %d\n',format,seqIdx);
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for preambleIdx=0:63
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for CyclicShift=0:15
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%for hs=0:1
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hs=0;
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ueConfig.NULRB=NULRB(n_rb);
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prachConfig.Format=format;
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prachConfig.SeqIdx=seqIdx;
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prachConfig.PreambleIdx=preambleIdx;
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prachConfig.CyclicShiftIdx=CyclicShift;
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prachConfig.HighSpeed=hs;
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[mat, info]=ltePRACH(ueConfig,prachConfig);
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lib=liblte_prach(ueConfig,prachConfig);
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err=mean(abs(mat(:)-lib(:)));
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if (err > 10^-3)
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disp(err)
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error('Error!');
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end
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% end
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end
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end
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end
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end
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end
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%
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% disp(info)
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n=1:length(mat);
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% plot(abs(double(mat)-double(lib)))
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flib=fft(lib(199:end),1536);
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fmat=fft(mat(199:end),1536);
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n=1:1536;
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plot(n,real(flib(n)),n,real(fmat(n)))
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