BER is showing zero

%% Parameters & Functions

Rb=10e9; % Data Rate

B=2e10 ;% Bandwidth

Lam=1550e-9; % Wavelength

Rd=0.85; %Responsivity

Plo=3e-3; %local oscillator power

Cs=1e-14; % Refractive Index Para for strong

e=1.6023e-19; % charge of electron

K=1.38e-23;

Rl=50; % Load Resistance

T=300; % Temperature

Pt=4e-3; % transmitter power

Pr=4e-3; % receiver power

IdB=linspace(0,75,100);

I=10.^(IdB/10);

SNR= @(I) (((2*Rd*sqrt(4*Pr*Plo.*I)).^2)./(2*B*e*((Rd*Pr.*I)+(Rd*Plo))))+ (4*K*T*B/Rl);

SNRdB= @(I) 10*log10(SNR(I));

BER= @(I) (0.5*erfc(sqrt(SNR(I)/2)/2));

R= BER(I)

I am getting all zeros for BER. What should I do?

Answer 1

[Sriram Tadavarty]

Hi Ruhin,

You get zero BER due to very high SNR in the range of 65 to 68 dB.

Try to modify the IdB to a very low value, to reduce the SNR and to oberve the BER. Something like the modification shown below:

IdB=linspace(-100,75,100);

Hope this helps.

Regards,

Sriram

[RUHIN CHOWDHURY]

Thank you so much.