mirror of https://github.com/PentHertz/srsLTE.git
135 lines
4.5 KiB
Matlab
135 lines
4.5 KiB
Matlab
clear
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ueConfig=struct('NCellID',1,'RNTI',46,'NULRB',25,'CyclicPrefixUL','Normal','NTxAnts',1,'Hopping','Off');
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pucchConfig=struct('NLayers',1,'OrthCover','Off','Shortened',0);
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format_str={'1','1a'};
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threshold=[0.5 0];
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formats=1;
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pucchConfig.ResourceIdx= 0;
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pucchConfig.DeltaShift = 2;
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pucchConfig.CyclicShifts = 0;
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pucchConfig.ResourceSize=2;
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ueConfig.NSubframe=9;
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enable_fading=false;
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SNR_values=-5;%linspace(-8,0,8);
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Nreal=50;
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% Setup Fading channel model
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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 = 'EVA'; % 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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% Setup matlab 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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addpath('../../debug/srslte/lib/phch/test')
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ber=zeros(length(formats),length(SNR_values));
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ber2=zeros(length(formats),length(SNR_values));
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for f=1:length(formats)
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nb=formats(f);
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for s=1:length(SNR_values)
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SNRdB=SNR_values(s);
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SNR = 10^(SNRdB/10); % Linear SNR
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errors = 0;
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errors2 = 0;
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for n=1:Nreal
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bits=randi(2,nb-1,1)-1;
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[sym_mat, info]=ltePUCCH1(ueConfig,pucchConfig,bits);
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idx=ltePUCCH1Indices(ueConfig,pucchConfig);
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[dmrs_mat, info_dmrs]=ltePUCCH1DRS(ueConfig,pucchConfig);
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idx_dmrs=ltePUCCH1DRSIndices(ueConfig,pucchConfig);
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% Resource mapping
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subframe_tx = lteULResourceGrid(ueConfig);
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subframe_tx(idx)=sym_mat;
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subframe_tx(idx_dmrs)=dmrs_mat;
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[txWaveform, info] = lteSCFDMAModulate(ueConfig,subframe_tx);
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cfg.SamplingRate = info.SamplingRate;
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% Fading
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if (enable_fading)
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rxWaveform = lteFadingChannel(cfg,txWaveform);
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else
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rxWaveform = txWaveform;
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end
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% Noise Addition
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N0 = 1/(sqrt(2.0*double(info.Nfft))*SNR);
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noise = N0*complex(randn(size(rxWaveform)), randn(size(rxWaveform))); % Generate noise
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rxWaveform = rxWaveform + noise;
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% Demodulate
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subframe_rx = lteSCFDMADemodulate(ueConfig, rxWaveform);
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% Perform channel estimation
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[hest, nest] = lteULChannelEstimatePUCCH1(ueConfig, pucchConfig, cec, subframe_rx);
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% Equalize
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pucchSymbols = lteEqualizeMMSE(subframe_rx(idx), hest(idx), nest);
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% Decoding
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bits_rx = ltePUCCH1Decode(ueConfig, pucchConfig, length(bits), pucchSymbols);
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% Check errors
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a=size(bits_rx);
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if (a(2) ~= 1)
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errors = errors + 1;
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elseif (formats(f) == 2)
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if (a(1) ~= 1)
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errors = errors + 1;
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elseif (bits_rx(1) ~= bits(1))
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errors = errors + 1;
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end
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end
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% Decoding srsLTE
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[bits_rx,z,ce]= srslte_pucch(ueConfig, pucchConfig, length(bits), subframe_rx, threshold);
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% Check errors
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a=size(bits_rx);
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if (a(2) ~= 1)
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errors2 = errors2 + 1;
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elseif (formats(f) == 2)
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if (a(1) ~= 1)
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errors2 = errors2 + 1;
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elseif (bits_rx(1) ~= bits(1))
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errors2 = errors2 + 1;
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end
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end
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end
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ber(f,s)=errors/Nreal;
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ber2(f,s)=errors2/Nreal;
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fprintf('Format %s, SNR=%.1f dB, errors=%d, errors2=%d\n', format_str{formats(f)},SNRdB,errors,errors2);
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end
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end
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semilogy(SNR_values,ber,SNR_values,ber2)
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xlabel('SNR (dB)')
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ylabel('BER')
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grid on
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legend(format_str(formats))
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