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145 lines
4.3 KiB
Matlab
145 lines
4.3 KiB
Matlab
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SNR_values = linspace(-6,4,10);
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Npackets = 200;
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CFO=4/15;
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m0=7;
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m1=10;
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%m0=26;
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%m1=21;
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recordedWaveform = x;
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if (~isempty(recordedWaveform))
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Npackets = floor(length(recordedWaveform)/19200)-1;
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SNR_values = 0;
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end
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error = zeros(6,length(SNR_values));
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enb = struct('NCellID',2,'NSubframe',0,'NDLRB',6,'CellRefP',1,'CyclicPrefix','Normal','DuplexMode','FDD');
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sss=lteSSS(enb);
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cfg.Seed = 2; % Random channel seed
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cfg.NRxAnts = 1; % 1 receive antenna
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cfg.DelayProfile = 'ETU'; % EVA delay spread
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cfg.DopplerFreq = 144; % 120Hz Doppler frequency
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cfg.MIMOCorrelation = 'Low'; % Low (no) MIMO correlation
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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 % Initialize at time zero
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[s, c0, c1] = get_sc(mod(enb.NCellID,3));
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subframe = lteDLResourceGrid(enb);
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sssSym = lteSSS(enb);
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sssInd = lteSSSIndices(enb);
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subframe(sssInd) = sssSym;
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N_id_1 = floor(enb.NCellID/3);
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[txWaveform,info] = lteOFDMModulate(enb,subframe);
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cfg.SamplingRate = info.SamplingRate;
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fftSize = info.Nfft;
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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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SNRdB = SNR_values(snr_idx);
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for i=1:Npackets
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%% Noise Addition
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SNR = 10^(SNRdB/10); % Linear SNR
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if (isempty(recordedWaveform))
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cfg.InitTime = i*(10^-3);
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[rxWaveform, info]= lteFadingChannel(cfg,txWaveform);
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rxWaveform = txWaveform;
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% Add CFO
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freq = CFO/double(fftSize);
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rxWaveform = rxWaveform.*exp(1i*2*pi*freq*(1:length(txWaveform))');
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N0 = 1/(sqrt(2.0*enb.CellRefP*double(fftSize))*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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else
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rxWaveform = recordedWaveform(i*19200+1:(i+1)*19200);
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end
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offset = lteDLFrameOffset(enb,rxWaveform);
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offsetVec(i)=offset;
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rxWaveform = [rxWaveform(1+offset:end,:); zeros(offset,1)];
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subframe_rx = lteOFDMDemodulate(enb,rxWaveform,1);
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sss_rx = subframe_rx(lteSSSIndices(enb));
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sss0=sss_rx(1:2:end);
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sss1=sss_rx(2:2:end);
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beta0=sss0.*c0';
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beta1=sss1.*c1';
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corr0=zeros(31,1);
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for m=1:31
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corr0(m)=sum(beta0.*s(m,:)');
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end
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corr0=abs(corr0).^2;
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[m, idx]=max(corr0);
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error(1,snr_idx) = error(1,snr_idx) + ((idx ~= m0 && idx ~= m1));
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M=2;
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Nm=10;
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corr2=zeros(31,1);
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for m=1:31
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for j=0:M
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idx=1+j*Nm:(j+1)*Nm;
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corr2(m)=corr2(m)+abs(sum(beta0(idx).*s(m,idx)')).^2;
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end
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end
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[m, idx]=max(corr2);
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error(2,snr_idx) = error(2,snr_idx) + ((idx ~= m0 && idx ~= m1));
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corr3=zeros(31,1);
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for m=1:31
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corr3(m)=abs(sum(beta0(2:end).*conj(beta0(1:end-1)).*transpose(s(m,2:end).*conj(s(m,1:end-1))))).^2;
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end
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[m, idx]=max(corr3);
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error(3,snr_idx) = error(3,snr_idx) + ((idx ~= m0 && idx ~= m1));
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% srsLTE results
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[n,sf_idx,lt_corr0]=srslte_sss(enb,rxWaveform,'full');
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[m, idx]=max(lt_corr0);
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error(4,snr_idx) = error(4,snr_idx) + ((idx ~= m0 && idx ~= m1));
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[n,sf_idx,lt_corr2]=srslte_sss(enb,rxWaveform,'partial');
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[m, idx]=max(lt_corr2);
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error(5,snr_idx) = error(5,snr_idx) + ((idx ~= m0 && idx ~= m1));
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[n,sf_idx,lt_corr3]=srslte_sss(enb,rxWaveform,'diff');
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[m, idx]=max(lt_corr3);
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error(6,snr_idx) = error(6,snr_idx) + ((idx ~= m0 && idx ~= m1));
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end
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end
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if (length(SNR_values) > 1)
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plot(SNR_values,1-error/Npackets)
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legend('Full','Partial','Differential','Full-lt','Partial-lt','Differential-lt')
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grid on
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else
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e=error/Npackets;
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fprintf('Full (mt/lt): \t%f/%f\n',e(1),e(4));
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fprintf('Partial (mt/lt):%f/%f\n',e(2),e(5));
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fprintf('Diff (mt/lt): \t%f/%f\n',e(3),e(6));
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end
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