HIPERLAN/2 PHY layer simulator on Matlab

CB,

Yes, that's exactly what i'm doing, but my ifft transmitter process is
a matrix of coefficents, with 64 samples input, and 320 samples
output. (i did that for the oversampling needed to pass the signal to
the channels with a min tap delay of 10ns). the fft receiver is the
transpose matrix of the previous one ..
anyway..
when i turn completely the noise off, i get a ZER BER. I detect the
symbols exactly with no errors.!

i really don't know where the problem comes from, when i introduce the
noise with the multi-path channel model.


 

cb135@hotmail.com (Col Brown) wrote in message news:<a254af6b.0406090950.7bed10d3@posting.google.com>...
> Hany,
> 
> The bin-by-bin multiplication is performed after you take the fft of
> your received signal.  Say the size of the fft=32.  Then you perform
> the multiplication of the inverse 32-point fft of the chnl impulse
> response and the fft of the received signal.  I assume that this is
> exactly what you're doing?  Is it not?  The result should be exactly
> what you transmitted.  Where are you getting the problems?  What
> happens when you turn the noise off completely?
> 
> As an example in Matlab code, the equ looks something like:
> 
> chnl = [1 0.5 0.1];
> equ = 1./fft(chnl,fft_size); % form zero forcing equ
> data = fft(rx,fft_size).* equ; % perform bin-by-bin multiplication
> 
> where rx is the received time domain signal after the prefix removal.
> 
> CB
>   
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