mirror of https://github.com/pvnis/srsRAN_4G.git
Added matlab tests for phich
Ismael Gomez
8 years ago
parent
0a2c164ae7
commit
aa62a32b90
@ -0,0 +1,132 @@
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clear
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%% PHICH encoding/decoding
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%% Setup simulation
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Npackets = 80;
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SNR_values = linspace(-6,0,6);
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enable_fading=false;
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addpath('../../debug/srslte/lib/phch/test')
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%% Cell-Wide Settings
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enbConfig.NDLRB = 50; % No of Downlink RBs in total BW
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enbConfig.CyclicPrefix = 'Normal'; % CP length
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enbConfig.Ng = 'One'; % HICH groups
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enbConfig.CellRefP = 1; % 1-antenna ports
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enbConfig.NCellID = 36; % Physical layer cell identity
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enbConfig.NSubframe = 5; % Subframe number 0
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enbConfig.DuplexMode = 'FDD'; % Frame structure
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enbConfig.PHICHDuration = 'Normal';
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%% Define HI resource
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hi_res = [1 1];
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ack_bit = 1;
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%% Setup Fading channel model
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if (enable_fading)
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cfg.Seed = 8; % Random channel seed
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cfg.NRxAnts = 1; % 1 receive antenna
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cfg.DelayProfile = 'EPA'; % EVA delay spread
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cfg.DopplerFreq = 5; % 120Hz Doppler frequency
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cfg.MIMOCorrelation = 'Low'; % Low (no) MIMO correlation
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cfg.InitTime = 0; % Initialize at time zero
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cfg.NTerms = 16; % Oscillators used in fading model
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cfg.ModelType = 'GMEDS'; % Rayleigh fading model type
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cfg.InitPhase = 'Random'; % Random initial phases
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cfg.NormalizePathGains = 'On'; % Normalize delay profile power
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cfg.NormalizeTxAnts = 'On'; % Normalize for transmit antennas
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end
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% Setup channel equalizer
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cec.PilotAverage = 'UserDefined'; % Type of pilot averaging
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cec.FreqWindow = 9; % Frequency window size
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cec.TimeWindow = 9; % Time window size
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cec.InterpType = 'linear'; % 2D interpolation type
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cec.InterpWindow = 'Causal'; % Interpolation window type
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cec.InterpWinSize = 1; % Interpolation window size
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%% Generate TX subframe
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subframe_tx = lteDLResourceGrid(enbConfig);
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%% Genearte PHICH signal
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hi_sym_tx = ltePHICH(enbConfig, [hi_res ack_bit]);
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hi_indices = ltePHICHIndices(enbConfig);
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subframe_tx(hi_indices)=hi_sym_tx;
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%% Add references to subframe
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cellRsSym = lteCellRS(enbConfig);
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cellRsInd = lteCellRSIndices(enbConfig);
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subframe_tx(cellRsInd) = cellRsSym;
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%% Modulate signal
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[txWaveform, info] = lteOFDMModulate(enbConfig,subframe_tx);
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cfg.SamplingRate = info.SamplingRate;
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%% Start simulation
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decoded = zeros(size(SNR_values));
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decoded_srslte = zeros(size(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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SNR = 10^(SNRdB/10); % Linear SNR
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N0 = 1/(sqrt(2.0*enbConfig.CellRefP*double(info.Nfft))*SNR);
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for i=1:Npackets
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%% Fading
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rxWaveform = sum(txWaveform,2);
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if (enable_fading)
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rxWaveform = lteFadingChannel(cfg,rxWaveform);
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end
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%% Noise Addition
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noise = N0*complex(randn(size(rxWaveform)), randn(size(rxWaveform)));
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rxWaveform = rxWaveform + noise;
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%% Demodulate
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subframe_rx = lteOFDMDemodulate(enbConfig, rxWaveform);
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%% Channel estimation
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if (enable_fading)
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[hest, nest] = lteDLChannelEstimate(enbConfig, cec, subframe_rx);
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else
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hest=ones(size(subframe_rx));
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nest=0;
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end
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%% Extract resources
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phichSymbolsRx = subframe_rx(hi_indices);
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phichSymbolsHest = hest(hi_indices);
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%% PHICH decoding
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[hi, hi_symbols] = ltePHICHDecode(enbConfig,hi_res, phichSymbolsRx, phichSymbolsHest, nest);
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decoded(snr_idx) = decoded(snr_idx) + (hi == ack_bit);
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%% Same with srsLTE
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[hi_srslte, hi_symbols_srslte] = srslte_phich(enbConfig, hi_res, subframe_rx, hest, nest);
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decoded_srslte(snr_idx) = decoded_srslte(snr_idx) + (hi_srslte == ack_bit);
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end
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fprintf('SNR: %.1f\n',SNRdB)
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end
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if (Npackets>1)
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semilogy(SNR_values,1-decoded/Npackets,'bo-',...
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SNR_values,1-decoded_srslte/Npackets, 'ro-')
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grid on
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legend('Matlab','srsLTE')
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xlabel('SNR (dB)')
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ylabel('BLER')
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axis([min(SNR_values) max(SNR_values) 1/Npackets/10 1])
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else
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scatter(real(hi_symbols),imag(hi_symbols))
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hold on
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scatter(real(hi_symbols_srslte),imag(hi_symbols_srslte))
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hold off
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grid on;
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axis([-2 2 -2 2])
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disp(hi)
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disp(hi_srslte)
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end
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@ -0,0 +1,173 @@
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero 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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* srsLTE 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 Affero General Public License for more details.
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*
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* A copy of the GNU Affero 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 "srslte/srslte.h"
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#include "srslte/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 HIRES prhs[1]
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#define INPUT prhs[2]
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#define NOF_INPUTS 3
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void help()
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{
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mexErrMsgTxt
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("[hi, symbols] = srslte_phich(enbConfig, hires, input_signal, [hest, nest])\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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srslte_cell_t cell;
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srslte_phich_t phich;
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srslte_chest_dl_t chest;
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srslte_ofdm_t ofdm_rx;
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srslte_regs_t regs;
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uint32_t sf_idx;
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cf_t *input_fft, *input_signal;
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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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if (mexutils_read_uint32_struct(ENBCFG, "NSubframe", &sf_idx)) {
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help();
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return;
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}
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if (srslte_chest_dl_init(&chest, cell)) {
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mexErrMsgTxt("Error initializing equalizer\n");
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return;
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}
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if (srslte_ofdm_rx_init(&ofdm_rx, cell.cp, cell.nof_prb)) {
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mexErrMsgTxt("Error initializing FFT\n");
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return;
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}
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if (srslte_regs_init(®s, cell)) {
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mexErrMsgTxt("Error initiating regs\n");
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return;
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}
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if (srslte_phich_init(&phich, ®s, cell)) {
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mexErrMsgTxt("Error creating PHICH object\n");
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return;
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}
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// Read input signal
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input_signal = NULL;
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int insignal_len = mexutils_read_cf(INPUT, &input_signal);
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if (insignal_len < 0) {
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mexErrMsgTxt("Error reading input signal\n");
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return;
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}
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if (insignal_len == SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp)) {
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input_fft = input_signal;
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} else {
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input_fft = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
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srslte_ofdm_rx_sf(&ofdm_rx, input_signal, input_fft);
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free(input_signal);
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}
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cf_t *ce[SRSLTE_MAX_PORTS];
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for (i=0;i<cell.nof_ports;i++) {
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ce[i] = srslte_vec_malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
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}
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if (nrhs > NOF_INPUTS) {
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cf_t *cearray = NULL;
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mexutils_read_cf(prhs[NOF_INPUTS], &cearray);
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cf_t *cearray_ptr = cearray;
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for (i=0;i<cell.nof_ports;i++) {
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for (int j=0;j<SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);j++) {
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ce[i][j] = *cearray_ptr;
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cearray_ptr++;
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}
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}
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if (cearray) {
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free(cearray);
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}
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} else {
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srslte_chest_dl_estimate(&chest, input_fft, ce, sf_idx);
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}
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float noise_power;
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if (nrhs > NOF_INPUTS + 1) {
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noise_power = mxGetScalar(prhs[NOF_INPUTS+1]);
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} else if (nrhs > NOF_INPUTS) {
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noise_power = 0;
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} else {
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noise_power = srslte_chest_dl_get_noise_estimate(&chest);
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}
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// Read hires values
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float *hires = NULL;
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int nhires = mexutils_read_f(HIRES, &hires);
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if (nhires != 2) {
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mexErrMsgTxt("Expecting 2 values for hires parameter\n");
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return;
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}
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uint32_t ngroup = (uint32_t) hires[0];
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uint32_t nseq = (uint32_t) hires[1];
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uint8_t ack;
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float corr_res;
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int n = srslte_phich_decode(&phich, input_fft, ce, noise_power, ngroup, nseq, sf_idx, &ack, &corr_res);
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if (nlhs >= 1) {
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if (n < 0) {
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plhs[0] = mxCreateDoubleScalar(-1);
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} else {
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plhs[0] = mxCreateDoubleScalar(ack);
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}
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}
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if (nlhs >= 2) {
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mexutils_write_cf(phich.z, &plhs[1], 1, SRSLTE_PHICH_NBITS);
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}
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srslte_chest_dl_free(&chest);
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srslte_ofdm_rx_free(&ofdm_rx);
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srslte_phich_free(&phich);
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srslte_regs_free(®s);
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for (i=0;i<cell.nof_ports;i++) {
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free(ce[i]);
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}
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free(input_fft);
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return;
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}
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