Numerical optimization for CDMA spreading sequences

Author

El-Tarhuni, Mohamed G. ; Sheikh, Asrar U.

Author_Institution

Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada

Volume

1

fYear

1995

Firstpage

24

Abstract

The performance of a direct sequence spread spectrum (DS-SS) code division multiple access (CDMA) communications systems is highly dependent upon the set of spreading sequences used in these systems. The multiple access interference could become very large if the spreading sequences are not carefully selected. A new numerical optimization procedure is proposed for the selection of spreading sequences based on minimizing the interference parameter among the sequences. The improvement in the average output signal-to-noise ratio or CDMA capacity improvement is used to compare the performance of the optimized code set with that of the set of Gold codes of the same length. An improvement of about 26% in the system capacity is obtained. Also, construction of different optimized code sets suitable for use in cellular systems applications is considered

Keywords

cellular radio; code division multiple access; land mobile radio; mobile satellite communication; optimisation; pseudonoise codes; radiofrequency interference; spread spectrum communication; CDMA capacity improvement; CDMA spreading sequences; DS-SS; Gold codes; average output signal-to-noise ratio; cellular systems applications; code division multiple access; code length; communications systems; direct sequence spread spectrum; interference parameter; multiple access interference; numerical optimization; optimized code set; system performance; Autocorrelation; Bit error rate; Drives; Gold; High performance computing; Interference constraints; Multiaccess communication; Multiple access interference; Spread spectrum communication; Systems engineering and theory;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 1995. Canadian Conference on

Conference_Location

Montreal, Que.

ISSN

0840-7789

Print_ISBN

0-7803-2766-7

Type

conf

DOI

10.1109/CCECE.1995.528066

Filename

528066