can anybody help me in rayleigh channel object.i dont kmow how to pass my signal through rayleigh channel?

fD=12; %Doppler frequency in Hz

ts= 5.0000e-04; %sampling time in seconds (1/2000)

 fs=2000;                                                        %sampling frequency

 pathDelays=[0 0.1 1 5 10 15 20].*1e-6;                                % delay for the three paths is seconds

avgPathGains=[0, -2, -3, -10, -15, -18, -20]; % average path gains in each of the three paths in dB

rchan = comm.RayleighChannel('SampleRate',fs, ...

'PathDelays',pathDelays,'AveragePathGains',avgPathGains, ...

'MaximumDopplerShift',fD,'FadingTechnique','Sum of sinusoids'); %Rayleigh channel

faded_signal=filter(rchan,modulated_signal); %Tx signal passing through channel