simulation of a rayleigh block fading channel in matlab

[akamouch]

Hello Everyone ;

I'm trying to simulate a communication system using matlab
In my system the channel is assumed to be rayleigh block fading i.e the channel is static during the transmission of one block and vary from a block to another.

My code is as follows :

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Code C - [expand]
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channel = sqrt(0.5*channel_var)*(randn(1,1) + i*randn(1,1)) ;
Noise = sqrt(0.5*noise_spectral_density/2)*(randn(1,length(data)) + ... i*randn(1,length(data))) ;

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have two questions :

is my code correct ?
for the noise should I use randn(1,1) or randn(1,length(data) (as the channel is considered block fading)

thanks for your help