How to plot BER graph for OOk modulation..

Question

sashish acharya 2016-4-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281845-how-to-plot-ber-graph-for-ook-modulation

I tried following code to calculate BER for ook modulation. I dont know if its correct or not....If its wrong then whats the correct way to do it?

 % Frame Length
bit_count = 1000;
SNR = 0: 1:40; %Range of SNR over which to simulate
uncoded_bits  = round(rand(1,bit_count)) % Generate some random bits
 for aa = 1: 1: length(SNR)
    T_Errors = 0;
    T_bits = 0;
    while T_Errors <500  % Keep going until you get 100 errors
       % ook modulator
        tx =uncoded_bits;    %Is this correct????
        N0 = 1/10^(SNR(aa)/10);  % Noise variance
        % Rayleigh channel fading
        h = 1/sqrt(2)*[randn(1,length(tx)) + j*randn(1,length(tx))]; 
        % Send over Gaussian Link to the receiver
        rx = h.*tx + sqrt(N0/2)*(randn(1,length(tx))+i*randn(1,length(tx)));

%--------------------------------------------------------------------------

        % Equalization to remove fading effects. Ideal Equalization
        % Considered
        rx = rx./h;
        % BPSK demodulator at the Receiver
        rx2 = rx > 0
        % Calculate Bit Errors
        diff =  rx2-uncoded_bits
        T_Errors = T_Errors + sum(abs(diff))
        T_bits = T_bits + length(uncoded_bits)
    end
    % Calculate Bit Error Rate
    BER(aa) = T_Errors / T_bits;
    disp(sprintf('bit error probability = %f',BER(aa)));