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General Information
Prof. Wael Badawy
Department of Computing and Information Systems Umm Al Qura University, Canada
I'm happy to take on the position of editor in chief of IJCTE. We encourage authors to submit papers concerning any branch of computer theory and engineering.
IJCTE 2010 Vol.2(6): 877-881 ISSN: 1793-8201
DOI: 10.7763/IJCTE.2010.V2.255

Soft Decision Parallel Interference Cancellationfor Scrambled/Unscrambled DS-CDMA System

Sasipriya S. and Ravichandran C. S.

Abstract—A soft decision linear parallel interference cancellation for the direct sequence spread spectrum CDMA systems which can accommodate more users (K = N+M >N) than the processing gain of the system is analyzed in this paper. The proposed technique accommodates N users without any mutual interference and a number of additional users at the expense of a small signal-to-noise ratio. Two sets of orthogonal Gold codes are used, one for the first N users and the other for the additional users. Both the N users and additional users are overlaid by a set-specific pseudonoise scrambling sequence. The performance of scrambled and unscrambled system for matched filter and linear parallel interference cancellation is analyzed and the scrambled system is found better than unscrambled system. The allowable load of this scheme is investigated, so that the uncoded performance with linear parallel interference cancellation detector using soft (SDIC) decision functions remains close to the single user bound for N= 64 at 33% overloading.

Index Terms—Code division multiple access, Interference cancellation, Multiple access Interference, Orthogonal sequence.

Sasipriya S. is with the Department of Electronics and Communication Engineering, SSK College of Engineering & Technology, Coimbatore – 641105 as Associate Professor; e-mail: sasipriyakarthi@yahoo.com.
Ravichandran C. S. is with SSK College of Engineering, Coimbatore – 641105 as Principal; e-mail: eniyanravi@gmail.com.


Cite: Sasipriya S. and Ravichandran C. S., "Soft Decision Parallel Interference Cancellation for Scrambled/Unscrambled DS-CDMA System," International Journal of Computer Theory and Engineering vol. 2, no. 6, pp. 877-881, 2010.  

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