[Scilab-users] Error with BER curve with SISO system

[Serge Steer]

I detected at least two mistakes in your code:
- you do not use xa in the noise computation so the noise level is not used
-  the instruction
    error=bitxor(uint8(data(k1)),uint8(data_detect(k1)));ry slow
    uses k1 outside of the loop so k1=N
Moreover bitxor is very slow. it should be better to use

  bers(index)=size(find(data<>data_detect),"*")/N;
For an efficient computation of data_detect you can use find:

   data_detect=zeros(1,N);
   data_detect(real(y)>=0)=1;

Finally you can give a look at the Matlab/Octave function given at
http://www.dsplog.com/db-install/wp-content/uploads/2008/01/scriptbpsk_ber.m

Serge Steer
INRIA

Le 16/08/2013 06:52, dkpcad a écrit :
> Hi, I am trying to simulate the BER curve and trying to match the curve of
> simulation and analysis both. But, in my code the error = 0 so, BER
> simulation (bers) results zero. Also, not able to use the plot function
> properly. Please guide me for the same. ber_siso.sce
> <http://mailinglists.scilab.org/file/n4027238/ber_siso.sce>
>
>
>
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