Calculating SNR and BER

As I am newbie to signals, I have collected an appliance signal in frequency domain as follows:

(PSD- Power Spectral Density). So, I need to calculate the SNR (Signal to Noise Ratio) and BER (Bit Error Rate) caused by this signal in Powerline Calculation. So, I have made these codes in Matlab, but what I am stuck with is calculating the SNR and BER.

    bits=10000; %number of bit
    b=randi([0,1],1,bits); % generate random [0,1]
    t=0:1/30:1-1/30; % Time period allocated for the signal

    %ASK Carrier Signals
    carrier_signa_l= sin(2*pi*t);
    E1=sum(carrier_signa_l.^2);
    carrier_signa_l=carrier_signa_l/sqrt(E1); %unit energy 
    carrier_signal_0 =0 * sin(2*pi*t); % zeros for 0 bits in the carrier signal

    %MODULATION
    ask=[];
    for i=1:bits
        if b(i)==1 % If bit = 1
            ask=[ask carrier_signa_l];
        else
            ask=[ask carrier_signal_0];
        end
    end