Added baseband and passband simulations. Passband is buggy.

[4yp.git] / RRC_PSK_BER_SNR.m

diff --git a/RRC_PSK_BER_SNR.m b/RRC_PSK_BER_SNR.m
deleted file mode 100644 (file)
index 73d67f3..0000000
--- a/RRC_PSK_BER_SNR.m
+++ /dev/null
@@ -1,94 +0,0 @@
-function RRC_PSK_BER_SNR(rolloff, M, numSymbs)
-  %% Set defaults for inputs
-  if nargin < 3
-    numSymbs = 1000;
-  end
-  if nargin < 2
-    M = 2;
-  end
-  if nargin < 1
-    rolloff = 0.5;
-  end
-
-  if isOctave()
-    pkg load communications
-  end
-
-  %% https://www.mathworks.com/help/signal/ref/rcosdesign.html
-  %% https://www.mathworks.com/help/comm/ug/pulse-shaping-using-a-raised-cosine-filter.html
-  span = 6; % filter span
-  sps = 4;
-
-  rrcFilter = rcosdesign(rolloff, span, sps, 'sqrt');
-
-  EbN0_db = 0:0.2:10;
-  EbN0 = 10 .^ (EbN0_db ./ 10);
-
-  Es = 1;
-  Eb = Es / log2(M);
-  N0 = Eb ./ EbN0;
-
-  EsN0 = EbN0 .* log2(M);
-  EsN0_db = 10 .* log10(EsN0);
-
-  plotlen = length(EbN0);
-
-  ber = zeros(1, plotlen);
-
-  data = randi([0 M - 1], numSymbs, 1);
-  modData = pskmod(data, M, 0, 'gray');
-
-  txSig = upfirdn(modData, rrcFilter, sps);
-
-  for i = 1:plotlen
-    snr = EbN0_db(i) + 10 * log10(log2(M));% - 10 * log10(sps); % why sps?
-    rxSig = awgn(txSig, snr);
-
-    rxFilt = upfirdn(rxSig, rrcFilter, 1, sps);
-    rxFilt = rxFilt(span + 1 : end - span); % remove filter delay
-
-    demodData = pskdemod(rxFilt, M, 0, 'gray');
-
-    [bitErrors, ber(i)] = biterr(data, demodData);
-  end
-
-  fig1 = figure(1);
-  clf;
-
-  %% Plot simulated results
-  semilogy(EbN0_db, ber, 'r', 'LineWidth', 2);
-  hold on;
-
-  %% Plot theoretical curve
-  %% BPSK: bit error when noise Nr > sqrt(Eb)
-  %%   Pr(Nr > sqrt(Eb))
-  %% = Pr(Z > sqrt(Eb) / sqrt(N0/2))
-  %%
-  %% QPSK = 2 BPSKs, one real and one imaginary, each with one bit
-  %% so BER is the same as BPSK (assuming Gray code)
-  if M == 2 || M == 4
-    ber_th = qfunc(sqrt(2 * EbN0));
-    semilogy(EbN0_db, ber_th, 'b', 'LineWidth', 1);
-    legend('Simulated RRC', 'Discrete');
-  else
-    %% Approximation: J.G. Proakis and M. Salehi, 2000, Contemporary
-    %%                Communication Systems using MATLAB (Equations
-    %%                7.3.18 and 7.3.19), Brooks/Cole.
-    ber_ap = 2 * qfunc(sqrt(EbN0 * log2(M) * 2) * sin(pi / M)) / log2(M);
-    semilogy(EbN0_db, ber_ap, 'b', 'LineWidth', 1);
-    legend('Simulated RRC', 'Discrete');
-  end
-
-  title(strcat(num2str(M), '-PSK RRC with Gray code'));
-  grid on;
-  xlabel('$E_b/N_0$ (dB)');
-  ylabel('BER');
-
-  formatFigure;
-  %saveas(gcf, strcat('BER_SNR_', num2str(M), 'PSK_', num2str(numSymbs), ...
-  %                   '.svg'));
-
-  %scatterplot(rxFilt);
-  %eyediagram(rxFilt, sps);
-
-end