ofdm simulation (BER Vs SNR )

hi
i am using this code for simulation of ofdm

clear all;
Fd=1;             % symbol rate (1Hz)
Fs=1*Fd;          % number of sample per symbol
M=4;              % kind(range) of symbol (0,1,2,3)

Ndata=128;       % all transmitted data symbol
Sdata=8;         % 8 data symbol per frame to ifft
Slen=16;         % 16 length symbol for IFFT


X=zeros(Ndata,1);
Y1=zeros(Ndata,1);
Y2=zeros(Ndata,1);
Y3=zeros(Slen,1);
z0=zeros(Slen,1);
z1=zeros(Ndata/Sdata*Slen,1);

% random integer generation by M kinds
X = randint(Ndata, 1, M);

% digital symbol mapped as analog symbol
Y1 = modmap(X, Fd, Fs, 'qask', M);

% covert to complex number
Y2=amodce(Y1,1,'qam')

j=1

    for i=1:Sdata;
        Y3(i+Slen/2-Sdata/2,1)=Y2(i+(j-1)*Sdata,1);
    end

    z0=ifft(Y3)

    for i=1:Slen;
        z1(((j-1)*Slen)+i)=z0(i,1);
    end


Y4 = fft(z1,Ndata*Ndata);

for j=1:Ndata/Sdata*Slen;
if abs(Y4(j)) < 0.0001
    Y4(j)=0.0001;
end
end

Y4 = 10*log10(abs(Y4));
figure(1);
f = linspace(-Sdata,Sdata,length(Y4));
plot(f,Y4,'k');
hold on;


Now i want to output BER vs SNR curve what should i do
tHaNx

On Aug 2, 7:57&#4294967295;am, zingas <shammashah...@gmail.com> wrote:
> hi
> i am using this code for simulation of ofdm
>
[snip]
>
> Now i want to output BER vs SNR curve what should i do
> tHaNx

Homework?