55 lines
1.4 KiB
Matlab
55 lines
1.4 KiB
Matlab
useprbs = 1;
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M = 8;
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randkey = 1;
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%%%%% PRBS Generation in correct shape for Modulation Format %%%%%%
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O = 18; %order of prbs
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N = 2^(O-1); %length of prbs
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[~,seed] = prbs(O,1); %initialize first seed of prbs
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bitpattern=[];
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if useprbs
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for i = 1:log2(M)
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[bitpattern(:,i),seed] = prbs(O,N,seed);
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end
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else
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s = RandStream('twister','Seed',randkey);
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for i = 1:log2(M)
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bitpattern(:,i) = randi(s,[0 1], N, 1);
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end
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end
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if M == 6
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bitpattern = reshape(bitpattern,[],1);
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bitpattern = bitpattern(1:end-mod(length(bitpattern),5));
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end
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Tx_bits = Informationsignal(bitpattern);
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Symbols_tx = PAMmapper(M,0).map(Tx_bits);
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Symbols_tx.fs = fsym;
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% Symbols = Duobinary().precode(Symbols_tx);
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Symbols = Duobinary().encode(Symbols_tx);
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% Symbols.spectrum("displayname","db","fignum",12)
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Symbols = Duobinary().feedbackdetector(Symbols);
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% Symbols.eye(fsym,M);
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% Symbols = Duobinary().decode(Symbols);
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Rx_bits = PAMmapper(M,0).demap(Symbols);
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[~,error_num,ber,error_pos] = calc_ber(Tx_bits.signal,Rx_bits.signal,"skip_front",0,"skip_end",1,"returnErrorLocation",1);
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disp(['BER: ',sprintf('%.1E',ber),' - - PAM-',num2str(M)]);
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%
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figure;hold on
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stairs(Rx_bits.signal(1:100,1),'LineWidth',2)
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stairs(Tx_bits.signal(1:100,1),'LineStyle',':','LineWidth',2);
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figure;hold on
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stairs(Symbols_tx.signal(1:100,1),'LineWidth',2)
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stairs(Symbols.signal(1:100,1),'LineStyle',':','LineWidth',2); |