mirror of https://github.com/pvnis/srsRAN_4G.git
Working on CDD precoder (matlab)
Ismael Gomez
8 years ago
parent
e4a94bcf33
commit
4d77eb9fa1
@ -1,65 +0,0 @@
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clear
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addpath('../../build/srslte/lib/mimo/test')
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%enb = lteRMCDL('R.10'); % 2-ports
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enb = lteRMCDL('R.0'); % 1-ports
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cec = struct('FreqWindow',9,'TimeWindow',9,'InterpType','cubic');
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cec.PilotAverage = 'UserDefined';
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cec.InterpWinSize = 1;
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cec.InterpWindow = 'Causal';
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cfg.Seed = 1; % Random channel seed
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cfg.NRxAnts = 2; % 1 receive antenna
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cfg.DelayProfile = 'ETU'; % EVA delay spread
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cfg.DopplerFreq = 100; % 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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[txWaveform, ~, info] = lteRMCDLTool(enb,[1;0;0;1]);
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cfg.SamplingRate = info.SamplingRate;
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txWaveform = txWaveform+complex(randn(size(txWaveform)),randn(size(txWaveform)))*1e-3;
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rxWaveform = lteFadingChannel(cfg,txWaveform);
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rxGrid = lteOFDMDemodulate(enb,rxWaveform);
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[h,n0] = lteDLChannelEstimate(enb,cec,rxGrid);
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s=size(h);
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p=s(1);
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n=s(2);
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if (length(s)>2)
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Nr=s(3);
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else
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Nr=1;
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end
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if (length(s)>3)
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Nt=s(4);
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else
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Nt=1;
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end
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rx=reshape(rxGrid,p*n,Nr);
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hp=reshape(h,p*n,Nr,Nt);
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if (Nt > 1)
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output_mat = lteTransmitDiversityDecode(rx, hp);
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else
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output_mat = lteEqualizeMMSE(rx, hp, n0);
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end
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output_srs = srslte_diversitydecode(rx, hp, n0);
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plot(abs(output_mat(:)-output_srs(:)))
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mean(abs(output_mat(:)-output_srs(:)).^2)
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t=1:100;
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plot(t,real(output_mat(t)),t,real(output_srs(t)))
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@ -0,0 +1,84 @@
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clear
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addpath('../../debug/srslte/lib/mimo/test')
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Nt=1;
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Nr=1;
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Nl=1;
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Ncw=1;
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txscheme='Port0';
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codebook=0;
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enb.NDLRB=6;
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Ns=enb.NDLRB*12*14;
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enb.CyclicPrefix='Normal';
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enb.CellRefP=Nt;
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enb.TotSubframes=1;
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cfg.Seed = 1; % Random channel seed
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cfg.NRxAnts = Nr; % 1 receive antenna
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cfg.DelayProfile = 'ETU'; % EVA delay spread
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cfg.DopplerFreq = 100; % 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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cec = struct('FreqWindow',9,'TimeWindow',9,'InterpType','cubic');
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cec.PilotAverage = 'UserDefined';
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cec.InterpWinSize = 1;
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cec.InterpWindow = 'Causal';
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sym = 2*rand(Ns*Nl,1)-1;
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layermap = lteLayerMap(sym, Nl, txscheme);
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tx = lteDLPrecode(layermap, Nt, txscheme, codebook);
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tx_srs = srslte_precoder(sym, Nl, Nt, txscheme);
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err_tx=mean(abs(tx_srs-tx).^2)
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[txwaveform, info] = lteOFDMModulate(enb, reshape(tx,enb.NDLRB*12,[],Nt));
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cfg.SamplingRate = info.SamplingRate;
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rxwaveform = lteFadingChannel(cfg, txwaveform);
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rxGrid = lteOFDMDemodulate(enb, rxwaveform);
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h=lteDLPerfectChannelEstimate(enb, cfg);
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hp=reshape(h,Ns,Nr,Nt);
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rx=reshape(rxGrid,Ns,Nr);
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if (Nt > 1)
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if (strcmp(txscheme,'TxDiversity')==1)
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output_mat = lteTransmitDiversityDecode(rx, hp);
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elseif (strcmp(txscheme,'CDD')==1 || strcmp(txscheme,'SpatialMux')==1)
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pdsch.NLayers=Nl;
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pdsch.RNTI=0;
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pdsch.TxScheme=txscheme;
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pdsch.PMISet=codebook;
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pdsch.NCodewords=Ncw;
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deprecoded = lteEqualizeMIMO(enb,pdsch,rx,hp,0);
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out_cw = lteLayerDemap(pdsch,deprecoded);
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output_mat = [];
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for i=1:Ncw
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output_mat = [output_mat out_cw{i}];
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end
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else
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error('Unsupported txscheme')
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end
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else
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output_mat = lteEqualizeMMSE(rx, hp, 0);
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end
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output_srs = srslte_predecoder(rx, hp, 0, txscheme);
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plot(abs(output_mat(:)-output_srs(:)))
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mean(abs(output_mat(:)-output_srs(:)).^2)
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t=1:100;
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plot(t,real(output_mat(t)),t,real(output_srs(t)))
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@ -0,0 +1,128 @@
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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 predecoder
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*/
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#define INPUT prhs[0]
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#define NLAYERS prhs[1]
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#define NPORTS prhs[2]
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#define TXSCHEME prhs[3]
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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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("[output] = srslte_decoder(input, NLayers, NCellRefP, TxScheme)\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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cf_t *input = NULL;
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cf_t *output = NULL;
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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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// Read input symbols
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int nof_symbols = mexutils_read_cf(INPUT, &input);
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if (nof_symbols < 0) {
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mexErrMsgTxt("Error reading input\n");
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return;
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}
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uint32_t nof_layers = mxGetScalar(NLAYERS);
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uint32_t nof_tx_ports = mxGetScalar(NPORTS);
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uint32_t nof_codewords = 1;
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mexPrintf("nof_tx_ports=%d, nof_layers=%d, nof_symbols=%d\n", nof_tx_ports, nof_layers, nof_symbols);
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cf_t *y[SRSLTE_MAX_PORTS];
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cf_t *x[SRSLTE_MAX_LAYERS];
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cf_t *d[SRSLTE_MAX_CODEWORDS];
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d[0] = input; // Single codeword supported only
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/* Allocate memory */
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for (int i = 0; i < nof_layers; i++) {
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x[i] = srslte_vec_malloc(sizeof(cf_t)*nof_symbols/nof_layers);
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}
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output = srslte_vec_malloc(sizeof(cf_t)*nof_symbols*nof_tx_ports/nof_layers);
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for (int i=0;i<nof_tx_ports;i++) {
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y[i] = &output[i*nof_symbols/nof_layers];
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}
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char *txscheme = "Port0";
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if (nrhs >= NOF_INPUTS) {
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txscheme = mxArrayToString(TXSCHEME);
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}
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srslte_mimo_type_t type = SRSLTE_MIMO_TYPE_SINGLE_ANTENNA;
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if (!strcmp(txscheme, "Port0")) {
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type = SRSLTE_MIMO_TYPE_SINGLE_ANTENNA;
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} else if (!strcmp(txscheme, "TxDiversity")) {
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type = SRSLTE_MIMO_TYPE_TX_DIVERSITY;
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} else if (!strcmp(txscheme, "CDD")) {
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type = SRSLTE_MIMO_TYPE_CDD;
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} else if (!strcmp(txscheme, "SpatialMux")) {
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type = SRSLTE_MIMO_TYPE_SPATIAL_MULTIPLEX;
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} else {
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mexPrintf("Unsupported TxScheme=%s\n", txscheme);
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return;
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}
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int symbols_layers[SRSLTE_MAX_LAYERS];
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for (int i=0;i<nof_layers;i++) {
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symbols_layers[i] = nof_symbols/nof_layers;
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}
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srslte_layermap_type(d, x, nof_codewords, nof_layers, symbols_layers, type);
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srslte_precoding_type(x, y, nof_layers, nof_tx_ports, nof_symbols/nof_layers, type);
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if (nlhs >= 1) {
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mexutils_write_cf(output, &plhs[0], nof_symbols/nof_layers, nof_tx_ports);
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}
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if (input) {
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free(input);
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}
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if (output) {
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free(output);
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}
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for (int i=0;i<nof_layers;i++) {
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if (x[i]) {
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free(x[i]);
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}
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}
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return;
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}
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