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45 lines
1.3 KiB
Matlab
45 lines
1.3 KiB
Matlab
enb = lteTestModel('1.1','5MHz');
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Ntrials = 1;
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SNR_values =-20;%linspace(-18,-10,8);
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tx_offset = randi(50,Ntrials,1);
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diff=zeros(size(SNR_values));
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diff_lt=zeros(size(SNR_values));
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tx_signal = lteTestModelTool(enb);
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tx_power = mean(tx_signal.*conj(tx_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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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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rx_offset = zeros(size(tx_offset));
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rx_offset_lt = zeros(size(tx_offset));
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for i=1:Ntrials
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SNR = 10^(SNRdB/10); % Linear SNR
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tx = [zeros(tx_offset(i),1); tx_signal];
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N0 = tx_power/(sqrt(2.0)*SNR);
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noise = N0*complex(randn(size(tx)), randn(size(tx))); % Generate noise
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rx=noise+tx;
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[rx_offset(i),corr] = lteDLFrameOffset(enb,rx,corrcfg);
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[rx_offset_lt(i),corr_lt] = liblte_pss(enb,rx);
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end
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diff(snr_idx)=sum(abs(rx_offset-tx_offset));
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diff_lt(snr_idx)=sum(abs(rx_offset_lt-tx_offset));
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disp(SNRdB)
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end
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if (Ntrials == 1)
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len=1:length(corr)-rx_offset(i)-3840;
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len2=rx_offset(i)+1+3840:length(corr);
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plot(len,corr(len)/max(corr(len)),...
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len,abs(corr_lt(len2))/max(abs(corr_lt(len2))));
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else
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plot(SNR_values,diff,SNR_values,diff_lt);
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end
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