Bit Error Rate

Matlab program for plotting of Bit error rate when

1. One signal transmitted per bit
2. Three signals transmitted per bit

Process when one signal transmitted per bit

Bg (Message Bits) >>s1 (Transmitting signal) >> s1t (Affected by AWGN) >>s1r (Regenerated bit by received signal)

Process when three signal transmitted per bit

Bg (Message Bits)>> s2 (Transmitting signal) >> s2t (Affected by AWGN) >>s2ro (Received signal) >> s2r (Regenerated bit by received signal)

Matlab code

clc; close all; clear all;

Tbit=input('Enter the no of bit = ');

y=rand(1,Tbit);

for i=1:length(y)

    if y(i)<=0.5

        Bg(i)=0;

        s1(i)=-1;

        s2(3*i-2:3*i)=-1;

    else

        Bg(i)=1;

        s1(i)=1;

        s2(3*i-2:3*i)=1;

    end;

 end;

snr=1:10;

n1=[];m1=[];m3=[];

for i=1:length(snr)

    s1t=awgn(s1,snr(i));

    s2t=awgn(s2,snr(i));

    for j=1:length(s1t)

         ifs 1t(j)<=0.5

             s1r(j)=0;

         else

             s1r(j)=1;

         end;

    end;

    for j=1:length(s2t)

        if s2t(j)<=0.5

            s2ro(j)=0;

        else

            s2ro(j)=1;

        end;

    end;

    for j=1:length(s2ro)/3

        if sum(s2ro(3*j-2:3*j))>1

            s2r(j)=1;

        else

            s2r(j)=0;

        end;

    end;

    ber1(i)=sum(xor(Bg,s1r)/Tbit);

    ber3(i)=sum(xor(Bg,s2r)/Tbit);

end;

semilogy(snr,ber1);

hold on;

semilogy(snr,ber3,'r');

xlabel('SNR-->');

ylabel('Bit Error Rate-->');

title('Comparison of Bit Error Rate');

legend('1 signal transmitted per bit','3 signal transmitted per bit');

Command window

Enter the no of bit = 10000

Figure window