clear
clear?all
close?all
q=1.6e-19;
%?Charge?of?Electron
Ib=202e-6;
%?Background?Noise?Current+interfernce
N0=2*q*Ib;
%?Noise?Spectral?Density?2*q*Ib
Rb=1e6;
%?bit?rate.
Tb=1/Rb;
%?bit?duration
R=1;
%?Receiver?responsivity.
sig_length=1e5;
%?No.?of?bits?in?the?input?OOK?symbols.
snr_dB=0:9;
%?signal-to-noise?ratio?in?dB.
SNR=10.^（snr_dB./10）;
%?signal-to-noise?ratio
for?i=1:length（snr_dB）
P_avg（i）=sqrt（N0*Rb*SNR（i）/（2*R^2））;
%?average?optical?power
i_peak（i）=2*R*P_avg（i）;
%?peak?photocurrent
Ep（i）=i_peak（i）^2*Tb;
%?Peak?Energy
sgma（i）=sqrt（N0*Ep（i）/2）;
%?sigma?standard?deviation