139 lines
3.6 KiB
Matlab
139 lines
3.6 KiB
Matlab
useprbs = 1;
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M = 2;
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randkey = 1;
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datarate = 448e9;
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fsym = round(datarate / log2(M)) ;
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%%%%% PRBS Generation in correct shape for Modulation Format %%%%%%
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O = 16; %O of prbs
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N = 2^(O); %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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state = struct();
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para = struct();
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if M == 6
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para.bl = 2^(O-2);
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para.dimension = 5;
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else
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para.bl = 2^(O-1);
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para.dimension = log2(M); %2.5bits/sym -> 2 bit/sym
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end
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para.rand = 0;
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para.order = floor(O / log2(M));
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para.skip =0;
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para.bruijn = 0;
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para.reset_prms = 0;
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para.method = 1;
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data_in = [];
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global loop;
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loop = 0;
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[data_out,state_] = prms(data_in, state, para);
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loop = 1;
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[data_out,state_out] = prms(data_in, state_, para);
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bitpattern = data_out';
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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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%%%%% Duobinary %%%%%%
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close all
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Symbols_tx = PAMmapper(M,0,"eth_style",0).map(Tx_bits);
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Symbols_tx.fs = fsym;
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precode = db_mode.db_precoded;
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%%% precode
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switch precode
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case db_mode.db_precoded
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Symbols_tx = Duobinary().precode(Symbols_tx);
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case db_mode.db_encoded
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Symbols_tx = Duobinary().precode(Symbols_tx);
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Symbols_tx = Duobinary().encode(Symbols_tx);
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case db_mode.no_db
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end
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for n = 10
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Symbols_rx = Symbols_tx;
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pos = 1;
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if n~=0
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for pos = 1:n
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po = randi(100);
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a = Symbols_rx.signal(100+pos) == Symbols_tx.signal(100+po);
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while a == 1
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po = po+1;
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po = randi(100);
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a = Symbols_rx.signal(100+pos) == Symbols_tx.signal(100+po);
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end
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Symbols_rx.signal(100+pos) = Symbols_tx.signal(100+po);
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end
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end
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error_positions = ~(Symbols_rx.signal == Symbols_tx.signal);
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error_positions = find(error_positions==1);
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switch precode
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case db_mode.db_precoded
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Symbols_rx = Duobinary().encode(Symbols_rx);
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Symbols_rx = Duobinary().decode(Symbols_rx);
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case db_mode.db_encoded
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Symbols_rx = Duobinary().decode(Symbols_rx);
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end
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Rx_bits = PAMmapper(M,0).demap(Symbols_rx);
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%%%%% Check BER of Bit Sequence %%%%%%
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[~,error_num(n+1),ber,error_pos] = calc_ber(Tx_bits.signal,Rx_bits.signal,"skip_front",10,"skip_end",10,"returnErrorLocation",1);
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% disp(['BER: ',sprintf('%.1E',ber),sprintf(' - Num. Err: %.1d',error_num(n+1)-2),' - - PAM-',num2str(M)]);
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fprintf('n: %d - Num. Err: %.1d \n',n,error_num(n+1));
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end
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figure(3);
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clf
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%sgtitle(['BER: ',num2str(ber),' // Error is at position: ',num2str(error_pos),''])
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subplot(2,2,1)
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hold on
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title('First Bits')
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stairs(Tx_bits.signal(100:150,1),'LineStyle','-','LineWidth',2,'DisplayName','Tx Bits');
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stairs(Rx_bits.signal(100:150,1),'LineWidth',2,'DisplayName','Rx Bits','LineStyle',':')
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legend
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subplot(2,2,2)
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title('Last Bits')
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hold on
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stairs(Tx_bits.signal(end-50:end,1),'LineStyle','-','LineWidth',2,'DisplayName','Tx Bits');
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stairs(Rx_bits.signal(end-50:end,1),'LineWidth',2,'DisplayName','Rx Bits','LineStyle',':')
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legend
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subplot(2,2,3)
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hold on
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title('First Symbols Compare')
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stairs(Symbols_tx.signal(1:100,1),'LineWidth',2,'DisplayName','Tx Symbols','LineStyle','-')
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stairs(Symbols_rx.signal(1:100,1),'LineStyle',':','LineWidth',2,'DisplayName','Rx Symbols');
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legend
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subplot(2,2,4)
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hold on
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title('Last Symbols Compare')
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stairs(Symbols_tx.signal(end-50:end,1),'LineWidth',2,'DisplayName','Tx Symbols','LineStyle','-')
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stairs(Symbols_rx.signal(end-50:end,1),'LineStyle',':','LineWidth',2,'DisplayName','Rx Symbols');
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legend |