62 lines
1.7 KiB
Matlab
62 lines
1.7 KiB
Matlab
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M = 4;
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apply_precode = 0;
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bitpattern = [];
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s = RandStream('twister','Seed',1);
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for i = 1:log2(M)
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N = 2^(17-1); %length of prbs
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bitpattern(:,i) = randi(s,[0 1], N, 1);
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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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bits = Informationsignal(bitpattern);
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symbols = PAMmapper(M,0).map(bits);
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bits_rx = PAMmapper(M,0).demap(symbols);
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[~,~,ber_direct,~] = calc_ber(bits.signal,bits_rx.signal,"skip_front",0,"skip_end",0,"returnErrorLocation",1);
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if apply_precode
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symbols_tx = Duobinary().precode(symbols);
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else
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symbols_tx = symbols;
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end
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show2Dconstellation(symbols_tx,symbols_tx,"displayname",'VNLE Out','fignum',2241);
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if apply_precode
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% Entschiedene Symbole codieren: d_DB(n) = d(n) + d(n-1) (im Fall von PAM4 7 level [0 1 2 3 4 5 6])
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symbols_db = Duobinary().encode(symbols_tx);
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% Entschiedene codierte Symbole decodieren: d_dec(n) = d_DB(n) mod4
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symbols_rx = Duobinary().decode(symbols_db);
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else
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symbols_rx = symbols_tx;
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end
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% Vergleichen von b(n) und d_dec(n)
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bits_rx = PAMmapper(M,0).demap(symbols_rx);
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[~,~,ber,~] = calc_ber(bits.signal,bits_rx.signal,"skip_front",10,"skip_end",10,"returnErrorLocation",1);
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disp(['BER: ',sprintf('%.1E',ber),' - - PAM-',num2str(M)]);
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figure(200)
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clf
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hold on
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start = 100;
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burstwidth = 10;
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idxs = start-10:start+burstwidth+10;
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scatter(idxs,d.signal(idxs),'DisplayName',['Orig Signal'],'Marker','o');
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scatter(idxs,d_burst.signal(idxs),'DisplayName',['Error Signal'],'Marker','x');
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scatter(idxs,d_dec.signal(idxs),'DisplayName',['EQ Signal'],'Marker','x');
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yline(PAMmapper(M,0).thresholds,'HandleVisibility','off');
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legend
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ylim([-2 2]) |