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Solution to a big fading problem in a wireless system

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najjarico

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I am implementing a wireless system in matlab-simulink ,
and in every wireless system there should be fading channel
after adding fading rayleigh block, the received signal is totaly changed
and the sample time decreased and I couldnt recover the original signal

I tried to add filters in the receiver but no changes happened.

Is there any solution for the fading problem like adding a certain filter or something else?
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Re: big fading problem

thank you for replay

this is the system in simulink
 

big fading problem

You can solve your problem reading articles or looking into textbooks about adaptive equalization in time varying channel. In Matlab Simulink you can find blocks using the LMS algorithm, but depending on the conditions of rayleigh channel you are simulating, I mean, how much severe it is, the LMS algorithm will not fit, so you will probably have to use a quasi newton method for speed up the optimization of the equalizer coeficients.
 

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    najjarico

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big fading problem

Hi,

Try "help firwiener" for a certain filter provide by matlab it's not complex to use and give performance quite well.
 

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    najjarico

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