Commit | Line | Data |
---|---|---|
1eeb62fb AIL |
1 | numSymbs = 10000; |
2 | M = 4; | |
3 | ||
4 | Rsym = 2.5e10; % symbol rate (sym/sec) | |
5e9be3c4 | 5 | rolloff = 0.5; |
1eeb62fb AIL |
6 | span = 6; % filter span |
7 | sps = 4; % samples per symbol | |
8 | ||
9 | fs = Rsym * sps; % sampling freq (Hz) | |
10 | Tsamp = 1 / fs; | |
11 | ||
5e9be3c4 | 12 | t = (0 : 1 / fs : numSymbs / Rsym + (1.5 * span * sps - 1) / fs).'; |
1eeb62fb AIL |
13 | |
14 | ||
15 | EbN0_db = 8; | |
16 | EbN0 = 10 .^ (EbN0_db ./ 10); | |
17 | ||
18 | Es = 1; | |
19 | Eb = Es / log2(M); | |
20 | N0 = Eb ./ EbN0; | |
21 | ||
22 | EsN0 = EbN0 .* log2(M); | |
23 | EsN0_db = 10 .* log10(EsN0); | |
24 | ||
25 | ||
26 | data = randi([0 M - 1], numSymbs, 1); | |
5e9be3c4 | 27 | modData = dpskmod(data, M, 0, 'gray'); |
1eeb62fb AIL |
28 | |
29 | x = txFilter(modData, rolloff, span, sps); | |
30 | ||
5e9be3c4 | 31 | linewidthTx = 0; % Hz |
1eeb62fb | 32 | linewidthLO = 1e6; % Hz |
1eeb62fb AIL |
33 | |
34 | [xPN, pTxLO] = phaseNoise(x, linewidthTx, linewidthLO, Tsamp); | |
35 | ||
36 | snr = EbN0_db + 10 * log10(log2(M)) - 10 * log10(sps); | |
1eeb62fb | 37 | |
5e9be3c4 AIL |
38 | %%y = awgn(xPN, snr, 'measured'); |
39 | y = xPN; | |
1eeb62fb AIL |
40 | |
41 | r = rxFilter(y, rolloff, span, sps); | |
42 | ||
1eeb62fb | 43 | |
5e9be3c4 AIL |
44 | rSampled = r(sps*span/2+1:sps:(numSymbs+span/2)*sps); |
45 | [rSaPhEq, phiests] = phaseNoiseCorr(rSampled, M, 40); | |
1eeb62fb | 46 | |
5e9be3c4 | 47 | demodData = dpskdemod(rSaPhEq, M, 0, 'gray'); |
1eeb62fb | 48 | |
5e9be3c4 | 49 | [bitErrors, ber] = biterr(data, demodData.') |
1eeb62fb AIL |
50 | |
51 | ||
52 | figure(2); | |
5e9be3c4 | 53 | plot(repelem(-phiests, sps)); |
1eeb62fb AIL |
54 | hold on; |
55 | plot(pTxLO); | |
56 | legend('estimate', 'actual'); | |
57 | title('Phase noise estimation'); | |
58 | hold off; | |
59 | ||
60 | figure(3); | |
5e9be3c4 | 61 | plot(t(1:length(x)), real(normalizeEnergy(x, numSymbs*sps, 1))); |
1eeb62fb | 62 | hold on; |
5e9be3c4 AIL |
63 | %%plot(t, real(rPhaseEq), 'r'); |
64 | sampledTimes = t(sps*span/2+1:sps:(numSymbs+span/2)*sps); | |
1eeb62fb | 65 | %%plot(sampledTimes, real(rSampled), 'x'); |
5e9be3c4 | 66 | plot(sampledTimes, real(normalizeEnergy(rSaPhEq, numSymbs, 1)), 'x'); |
1eeb62fb | 67 | legend('original signal', 'corrected received signal'); |
5e9be3c4 | 68 | title('Phase noise correction, linewidth 1 MHz, $E_b/N_0=8$ dB'); |
1eeb62fb AIL |
69 | ylabel('Real part of signals'); |
70 | axis([t(1) t(300) -Inf +Inf]); | |
71 | hold off; | |
72 | formatFigure; |