1 function phasenoise_AWGN(rolloff, M, numSymbs)
2 %% Set defaults for inputs
15 Rsym = 2.5e10; % symbol rate (sym/sec)
17 span = 6; % filter span
18 sps = 4; % samples per symbol
20 fs = Rsym * sps; % sampling freq (Hz)
23 t = (0 : 1 / fs : numSymbs / Rsym + (1.5 * span * sps - 1) / fs)';
27 EbN0 = 10 .^ (EbN0_db ./ 10);
33 EsN0 = EbN0 .* log2(M);
34 EsN0_db = 10 .* log10(EsN0);
36 plotlen = length(EbN0);
38 ber = zeros(1, plotlen);
41 data = randi([0 M - 1], numSymbs, 1);
42 modData = pskmod(data, M, 0, 'gray');
44 x = txFilter(modData, rolloff, span, sps);
46 linewidthTx = 0;%1e5; % Hz
47 linewidthLO = 1e6; % Hz
48 %%linewidthTx = Rsym * 1e-4; % Hz
49 %%linewidthLO = Rsym * 1e-3; % Hz
53 for iter = 1:totalIterations
54 [xPN, pTxLO] = phaseNoise(x, linewidthTx, linewidthLO, Tsamp);
57 snr = EbN0_db(i) + 10 * log10(log2(M)) - 10 * log10(sps);
58 noiseEnergy = 10 ^ (-snr / 10);
60 y = awgn(xPN, snr, 'measured');
62 r = rxFilter(y, rolloff, span, sps);
64 %r = normalizeEnergy(r, numSymbs, 1 + noiseEnergy);
66 [rPhaseEq, phiests] = phaseNoiseCorr(r, M, 40 * sps);
68 rSampled = rPhaseEq(sps*span/2+1:sps:(numSymbs + span/2) * sps);
69 demodData = pskdemod(rSampled, M, 0, 'gray')';
71 %%[bitErrors, ber(i)] = biterr(data, demodData);
72 [zzz, thisBER] = biterr(data, demodData);
73 ber(i) = ber(i) + thisBER / totalIterations;
76 if plotted == 0 && EbN0_db(i) >6 && ber(i) > 1e-1
82 legend('estimate', 'actual');
86 %plot(t(1:length(x)), real(x));
87 %%plot(t, real(x(1:length(t))));
91 %%plot(t(1:length(xPhaseNoise)), real(xPhaseNoise));
95 sampledTimes = t(sps*span/2+1:sps:(numSymbs+span/2)*sps);
97 plot(sampledTimes, real(rSampled), 'x')
109 %% Plot simulated results
110 semilogy(EbN0_db, ber, 'r', 'LineWidth', 2);
113 theoreticalPSK(EbN0_db, M, 'b', 'LineWidth', 1);
114 legend({'Simulated phase noise', 'Without phase noise'}, 'Location', 'southwest');
116 title(strcat(num2str(M), '-PSK with phase noise and correction'));
118 xlabel('$E_b/N_0$ (dB)');