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you can use Matlab Communication Toolbox .
this toolbox has two functions for simulating fading channels : rayleighchan & ricianchan .
chan = rayleighchan(ts,fd,tau,pdb) constructs a frequency-selective ("multiple path") fading channel object that models each discrete path as an independent Rayleigh fading process. tau is a vector of path delays, each specified in seconds. pdb is a vector of average path gains, each specified in dB.
you should choose property values that describe realistic fading channels.
You can model the effect of the channel on a signal x by using the syntax y = filter(chan,x).
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