Looking for valuable info about noise in CDMA

[EE-20]

regards!!!
hello 2 every one...m working on a paper regarding noise in CDMA...if any one know some thing important then do help me...I m working on the case that if users are increased in the given bandwidth then y noise comes widin CDMA although v r using orthogonal sequences (walsh codes)?
thnx in advance

 

[koppolu1981]

Re: Noise in CDMA

Hi,
In CDMA we spread the energy spectrum of signals over a large BandWidth using Orthogonal Pseudo Codes. Say, if 4 users data is spread over a spectrum of X BandWidth. when user 1 despreads in that bandwidth using the code provided to him, the data of other users appear as noise to user1 over the X BW. So if number of users are incresed the energy levels over the Bandwidth increases as the data spread across the BW increases., hence the noise.

Regards,
Ram

 

[ali_th]

Noise in CDMA

it is important to define your kind of demodulation.
proakis digital comunication have a good tutorial from noise in cdma.