4 Rsym = 2.5e10; % symbol rate (sym/sec)
6 span = 6; % filter span
7 sps = 8; % samples per symbol
9 fs = Rsym * sps; % sampling freq (Hz)
12 t = (0 : 1 / fs : numSymbs / Rsym + (1.5 * span * sps - 1) / fs).';
16 EbN0 = 10 .^ (EbN0_db ./ 10);
22 EsN0 = EbN0 .* log2(M);
23 EsN0_db = 10 .* log10(EsN0);
26 data = randi([0 M - 1], numSymbs, 1);
27 pskSym = pskmod(data, M, pi/M, 'gray');
28 dpskSym = dpskmod(data, M, pi/M, 'gray');
30 xPSK = txFilter(pskSym, rolloff, span, sps);
31 xDPSK = txFilter(dpskSym, rolloff, span, sps);
34 linewidthLO = 10e6; % Hz
36 [xPSKpn, pTxLoPSK] = phaseNoise(xPSK, linewidthTx, linewidthLO, Tsamp);
37 [xDPSKpn, pTxLoDPSK] = phaseNoise(xDPSK, linewidthTx, linewidthLO, Tsamp);
40 snr = EbN0_db + 10 * log10(log2(M)) - 10 * log10(sps);
42 yPSK = awgn(xPSKpn, snr, 'measured');
45 rPSK = rxFilter(yPSK, rolloff, span, sps);
46 rDPSK = rxFilter(yDPSK, rolloff, span, sps);
51 rPSKSa = rPSK(1:2:end);
52 rDPSKSa = rDPSK(1:2:end);
54 [rPSKSaPhEq, phiestsPSK] = phaseNoiseCorr(rPSKSa, M, pi/M, 80);
56 demodPSK = pskdemod(rPSKSaPhEq, M, pi/M, 'gray');
57 demodDPSK = dpskdemod(rDPSKSa, M, pi/M, 'gray');
60 [bitErrors, ber] = biterr(data, demodPSK.')
64 plot(t(1:80000), repelem(-phiestsPSK, 8));
66 plot(t(1:80000), pTxLoPSK(1:80000));
67 legend('estimate', 'actual');
68 title('Phase noise estimation');
72 plot(t(1:length(x)), real(normalizeEnergy(x, numSymbs*sps, 1)));
74 %%plot(t, real(rPhaseEq), 'r');
75 sampledTimes = t(sps*span/2+1:sps:(numSymbs+span/2)*sps);
76 %%plot(sampledTimes, real(rSampled), 'x');
77 plot(sampledTimes, real(normalizeEnergy(rSaPhEq, numSymbs, 1)), 'x');
78 legend('original signal', 'corrected received signal');
79 title('Phase noise correction, linewidth 1 MHz, $E_b/N_0=8$ dB');
80 ylabel('Real part of signals');
81 axis([t(1) t(300) -Inf +Inf]);