mirror of https://github.com/PentHertz/srsLTE.git
97 lines
2.9 KiB
Matlab
97 lines
2.9 KiB
Matlab
clear
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enb = lteTestModel('1.1','1.4MHz');
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Ntrials = 1;
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SNR_values = 100;%linspace(-8,0,6);
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flen=1920;
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fft_size=128;
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fading_enabled = true;
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tx_offset = 10;%randi(50,1,Ntrials);
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tx_signal = lteTestModelTool(enb);
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pss_idx = flen/2-fft_size+1:flen/2;
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pss_signal=tx_signal(pss_idx);
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tx_power = mean(pss_signal.*conj(pss_signal));
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corrcfg.PSS='On';
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corrcfg.SSS='On';
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corrcfg.CellRS='Off';
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cfg.Seed = 0; % 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 = 120; % 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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cfg.SamplingRate = flen*1000;
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addpath('../../build/srslte/lib/sync/test')
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addpath('../sync/')
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t = (0:length(tx_signal)-1).'/fft_size;
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L=fft_size;
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M=4;
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diff=zeros(length(SNR_values),M);
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for snr_idx=1:length(SNR_values)
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fprintf('SNR=%.1f dB\n', SNR_values(snr_idx));
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SNRdB = SNR_values(snr_idx);
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rx_offset = zeros(M,length(tx_offset));
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for i=1:Ntrials
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if fading_enabled
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[rx_signal, chinfo] = lteFadingChannel(cfg,tx_signal);
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else
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rx_signal = tx_signal;
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end
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SNR = 10^(SNRdB/10); % Linear SNR
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rx = [zeros(tx_offset(i),1); rx_signal];
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N0 = tx_power/(sqrt(2.0)*SNR);
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noise = N0*complex(randn(size(rx)), randn(size(rx))); % Generate noise
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rx=noise+rx;
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[rx_offset(1,i),corr_res] = lteDLFrameOffset(enb,rx(1:flen),corrcfg);
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% srsLTE in find mode
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[rx_offset(2,i),corr_lt] = srslte_pss(enb,rx(1:flen));
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rx_offset(2,i) = rx_offset(2,i) - flen/2;
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% srsLTE in tracking mode
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track_offset=2+rx_offset(2,i)+flen/2-fft_size-L/2;
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[rx_offset(3,i),corr_lt_track] = srslte_pss(enb,rx(track_offset:end),L);
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rx_offset(3,i) = rx_offset(2,i) + (rx_offset(3,i) - L/2) + 1;
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% CP based
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[rx_offset(4,i), corr_lt_cp] = srslte_cp_synch(enb, rx);
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end
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if fading_enabled
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ch_delay = chinfo.ChannelFilterDelay;
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else
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ch_delay = 0;
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end
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diff(snr_idx,:)=mean(abs(rx_offset-repmat(tx_offset,M,1) - ch_delay),2);
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end
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if (Ntrials == 1)
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disp(rx_offset)
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disp(diff)
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%plot(1:flen,abs(corr_res(1:flen)),1:flen,abs(corr_lt(1:flen)));
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t=1:L;
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plot(t,abs(corr_lt_track(t)));
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%plot(lambda)
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%plot(1:L,abs(corr_lt_track),[L/2, L/2], [0 max(abs(corr_lt_track))])
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grid on
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else
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plot(SNR_values,diff);
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legend('Matlab','srs find','srs tracking','srs cp')
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grid on
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xlabel('SNR (dB)')
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ylabel('Avg time offset')
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end
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