How can I generate a gaussian noise with :

I want to simulate Wcdma, with different processing gain and multiusers:

known:   SINR = P/(N0 + Interfernce)
         p = 1  (signal_power, in my case)
         Interference =  (number_users - 1)/PG
         with PG: processing gain
and I set

%loop%%%%%%%%%

 SINR = 0:2:20
 for N0 = 10.^(-SINR/10) - (number_users - 1)/PG;   % as in the formula)

 - after generating data, spreading, transmitting
   I  want te generate noise with   variance = PG/(2*SINR);
   I do like this

   noise = (randn(1,N+ j*randn(1,N))*N0;   %generate noise
   received_data =  desired_user + noise + interfernce_other_users 

 but it seems not working wel, And i think that the generation of noise 
is not good
Am write

thanks

maca

Hi

Have al look at www.dspguide.com

A as far as I remember there is an algorithm for generating
gauss-distributed random numbers with a defined mean and deviation in the
mathematics chapter. 

Perhaps that helps.

Christian

maca wrote:

> hallo
> 
> How can I generate a gaussian noise with :
> 
>  variance = SF/(2*EbN0);
> 
> SF : spreading factor
> EbN0 : Eb/N0
> 
> Thanks a lot
> maca

On 20 Aug 2003, maca wrote:

> hallo
>
> How can I generate a gaussian noise with :
>
>  variance = SF/(2*EbN0);
>
> SF : spreading factor
> EbN0 : Eb/N0
>
> Thanks a lot
> maca

depends on what you have available.

what do you have available?

-- 
The most rigorous proofs will be shown by vigorous handwaving.
http://www.mit.edu/~kusuma

opinion of author is not necessarily of the institute

hallo

How can I generate a gaussian noise with :

 variance = SF/(2*EbN0);

SF : spreading factor
EbN0 : Eb/N0

Thanks a lot
maca