Rayleigh multipath channel simulation

[jilly0124]

I have a code to simulate Rayleigh multipath channel, but the system says there is some errors which i cannot find.
Can you give me some help?

EB_NO_dB=0:2:20;
EB_NO = 10.^(EB_NO_dB/10);
sigmaN=sqrt(N/EB_NO )
[ch_spread_sig h t_delay]= mulit_pathchan(spread_sig,sigmaN);

Then, I used sub_function here:

function [ch_spread_sig h t_delay]=mulit_pathchan(spread_sig,sigmaN)

R=10000;                              % The length of the bit stream.
t_offset=[0 1 2 3];                  %Delay
gain=[0 -10 -15 -20];              %Channel gain in dB
gain_linear=10.^(gain/10);
n = sigmaN*(randn(1,R)+1j*randn(1,R))/sqrt(2);

for ii=1:length(gain_linear)
h(ii,:)=sqrt(gain_linear(ii))*(1/sqrt(2)*(randn(1,R) + 1j*randn(1,R)));           % Rayleigh channel
path_out(ii,:)=h(ii,:).*[zeros(1,t_offset(ii)) spread_sig(1:end-t_offset(ii))];
end

ch_spread_sig=sum(path_out,1)+n; % Multipath
t_delay=t_offset;

Kindly help me for this.

Thanks!

 

[karthiprime]

Can u print tat error??

 

[jilly0124]

Can u print tat error??

Error using ==> times
Matrix dimensions must agree.

Error in ==> path_out(ii,=h(ii,.*[zeros(1,t_offset(ii)) spread_sig(1:end-t_offset(ii))];

Error in ==> [ch_spread_sig h t_delay]= mulit_pathchan(spread_sig,sigmaN);

 

[jilly0124]

Still waiting :）

 

[Ahmed Alaa]

you can simply use rayleighchan() MATLAB function