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generation of AWGN

Started by maca August 20, 2003
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
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
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