New MPI mitigation schemes // Duobinary // Start of FTN schemes

test/duobinary_minimal_example.m

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+useprbs = 1;
+M = 8;
+randkey = 1;
+%%%%% PRBS Generation in correct shape for Modulation Format %%%%%%
+O = 18; %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);
+
+Symbols_tx = PAMmapper(M,0).map(Tx_bits);
+Symbols_tx.fs = fsym;
+
+% Symbols = Duobinary().precode(Symbols_tx);
+
+Symbols = Duobinary().encode(Symbols_tx);
+
+% Symbols.spectrum("displayname","db","fignum",12)
+
+Symbols = Duobinary().feedbackdetector(Symbols);
+
+% Symbols.eye(fsym,M);
+
+% Symbols = Duobinary().decode(Symbols);
+
+Rx_bits = PAMmapper(M,0).demap(Symbols);
+
+[~,error_num,ber,error_pos] = calc_ber(Tx_bits.signal,Rx_bits.signal,"skip_front",0,"skip_end",1,"returnErrorLocation",1);
+
+disp(['BER: ',sprintf('%.1E',ber),' - - PAM-',num2str(M)]);
+% 
+figure;hold on
+stairs(Rx_bits.signal(1:100,1),'LineWidth',2)
+stairs(Tx_bits.signal(1:100,1),'LineStyle',':','LineWidth',2);
+
+figure;hold on
+stairs(Symbols_tx.signal(1:100,1),'LineWidth',2)
+stairs(Symbols.signal(1:100,1),'LineStyle',':','LineWidth',2);