3676d92b30
+ duobinary_target now supports memoryless decoding (FFE targets DB response without MLSE) + PAMmapper.quantize now supports custom constellations for quantization + Added a new folder 'Documentations' for pdfs, slides, etc. + Added new FSO evaluation scripts in projects/FSO transmission/Evaluation Scripts + Added ffe_db (rudimentary module, not important anymore)
71 lines
2.3 KiB
Matlab
71 lines
2.3 KiB
Matlab
% einstellungen
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M = 2;
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apply_precode_at_tx = 0;
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% daten erzeugen
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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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tx_bits = Informationsignal(bitpattern);
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tx_symbols = PAMmapper(M,0).map(tx_bits);
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if apply_precode_at_tx
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% Precode
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tx_symbols_precoded = Duobinary().precode(tx_symbols);
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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(tx_symbols_precoded);
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% Entschiedene codierte Symbole decodieren: d_dec(n) = d_DB(n) mod4
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rx_symbols = Duobinary().decode(symbols_db);
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bits_rx = PAMmapper(M,0).demap(rx_symbols);
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figure(1)
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clf
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hold on
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stairs(tx_symbols.signal(1:100),'DisplayName','Tx Symbols','LineStyle','-','LineWidth',2);
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stairs(rx_symbols.signal(1:100),'DisplayName','Rx Symbols','LineStyle',':','LineWidth',1);
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legend
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ylim([-2 2])
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[~,~,ber,~] = calc_ber(tx_bits.signal,bits_rx.signal,"skip_front",0,"skip_end",0,"returnErrorLocation",1);
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disp(['BER: ',sprintf('%.1E',ber)]);
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assert(ber == 0)
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else
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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(tx_symbols);
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% Entschiedene codierte Symbole decodieren: d_dec(n) = d_DB(n) mod4
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rx_symbols = Duobinary().decode(symbols_db);
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bits_rx = PAMmapper(M,0).demap(rx_symbols);
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% ref symbole precoden:
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tx_symbols_ref = Duobinary().encode(tx_symbols);
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tx_symbols_ref = Duobinary().decode(tx_symbols_ref);
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tx_bits_ref = PAMmapper(M,0).demap(tx_symbols_ref);
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% step plot to check visually if symbols overlap
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figure(1)
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clf
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hold on
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stairs(tx_symbols_ref.signal(1:100),'DisplayName','Tx Symbols','LineStyle','-','LineWidth',2);
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stairs(rx_symbols.signal(1:100),'DisplayName','Rx Symbols','LineStyle',':','LineWidth',1);
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legend
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ylim([-2 2])
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[~,~,ber,~] = calc_ber(tx_bits_ref.signal,bits_rx.signal,"skip_front",1,"skip_end",1,"returnErrorLocation",1);
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disp(['BER: ',sprintf('%.1E',ber)]);
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assert(ber == 0)
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end |