PR filter viz

Zürich data Refactoring/ Organization
2026-04-21 15:24:01 +02:00
parent 5e5648d11a
commit 904eee0604
7 changed files with 242 additions and 1 deletions
--- a/Theory/Signal_Processing/partial_response_filter.m
+++ b/Theory/Signal_Processing/partial_response_filter.m
@@ -0,0 +1,100 @@
+
+% DUOBINARY CLASSES
+% Define the filter taps
+h_ = {1,[1 1],[1 2 1],[1 3 3 1]};
+desc = {'$1$','$(1+D)$','$(1+D)^2$','$(1+D)^3$'};
+
+for i = 1:length(h_)
+    h = h_{i};
+    
+    [H, w] = freqz(h, 1, 1024, 1);
+    
+    figure(1);
+    hold on
+    plot(w, 10*log10(abs(H)), 'LineWidth', 1, 'DisplayName',desc{i}); %todo
+    xlabel('Normalized Frequency');
+    ylabel('Amplitude in dB');
+    grid on;
+    ylim([-20,10]);
+    
+end
+
+legend
+beautifyBERplot("logscale",false,"setmarkers",false);
+% mat2tikz_improved("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/duobinary_response.tikz")
+
+%%
+
+% 1+ alpha D 
+% Define the filter taps
+h_ = {[1, 0],[1 0.2],[1 0.4],[1 0.6],[1 0.8],[1 1]};
+
+for i = 1:length(h_)
+    h = h_{i};
+    
+    [H, w] = freqz(h, 1, 1024, 1);
+    
+    figure(2);
+    hold on
+    plot(w, 10*log10(abs(H)), 'LineWidth', 2,'DisplayName',sprintf('$\\alpha = %.1f$', h(end))); %todo
+    xlabel('Normalized Frequency');
+    ylabel('Amplitude in dB');
+    grid on;
+    ylim([-15,5])
+end
+legend
+beautifyBERplot("logscale",false,"setmarkers",false);
+% mat2tikz_improved("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/partial_response.tikz")
+
+%%
+
+useprbs = 0;
+M = 4;
+randkey = 2;
+fsym = 112e9;
+
+%%%%% PRBS Generation in correct shape for Modulation Format %%%%%%
+O = 19; %order of prbs
+N = 2^(O-1); %length of prbs
+[~,seed] = prbs(O,1); %initialize first seed of prbs
+bitpattern=[];
+
+if useprbs
+    for i = 1:log2(M)
+        [bitpattern(:,i),seed] = prbs(O,N,seed);
+    end
+else
+    s = RandStream('twister','Seed',randkey);
+    for i = 1:log2(M)
+        bitpattern(:,i) = randi(s,[0 1], N, 1);
+    end
+end
+
+if M == 6
+    bitpattern = reshape(bitpattern,[],1);
+    bitpattern = bitpattern(1:end-mod(length(bitpattern),5));
+end
+
+Tx_bits = Informationsignal(bitpattern);
+
+Digi_Mod = PAMmapper(M,0);
+Symbols_tx = Digi_Mod.map(Tx_bits);
+Symbols_tx.fs = fsym;
+
+cnt = 1;
+
+Symbols = Symbols_tx;
+
+Symbols = Duobinary().precode(Symbols);
+Symbols = Duobinary().encode(Symbols);
+
+figure()
+histogram()
+
+% Symbols = Duobinary().decode(Symbols);
+
+
+% coeff = [1,0.5];
+% 
+% Symbols.signal = filter(coeff, 1, Symbols.signal);
+% Symbols.spectrum("fignum",2,"displayname",['coeff:',num2str(coeff)],"normalizeTo0dB",1);