How to set doppler shift, sampling time,path delay,path gains in rayleigh fading channel

For example:

Ts = 1e-4;   % Sample period (s)
fd = 100;    % Maximum Doppler shift
% Path delay and gains
tau = [0.1 1.2 2.3 6.2 11.3]*Ts;  
PdB = linspace(0, -10, length(tau)) - length(tau)/20;
h = rayleighchan(Ts, fd, tau, PdB)

where how the values of Ts,fd,tau,PdB are assigned

Answer 1

[Abdallah Ghazi Faisal Zaid Alkilani]

Take a look at:

https://www.mathworks.com/help/comm/ug/fading-channels.html#bq5zk36

Also the function you are using is already implemented in the Communications Toolbox.