On the Performance of Walsh-LS Codes in CDMA Systems

Author

Conti, P.G. ; Gunawardana, U. ; Liyana-Pathirana, R.

Author_Institution

Sch. of Eng. & Ind. Design, Univ. of Western Sydney, Sydney, NSW

fYear

2005

fDate

21-24 Nov. 2005

Firstpage

1

Lastpage

4

Abstract

Walsh-LS-CDMA (WLS-CDMA) systems is a novel concept employing loosely synchronous (LS) codes and Walsh codes. The Walsh-LS spreading codes exhibit an interference free window (IFW) in the auto-correlation and cross-correlation functions, which has the potential to suppress inter symbol interference (ISI) and multiple access interference (MAI), resulting in increased capacity compared to traditional CDMA systems. In this paper the perspective of WLS-CDMA is explored. It is found that the forward-link has better performance than traditional CDMA systems, however in the reverse-link the Walsh-LS codes lose orthogonality.

Keywords

code division multiple access; codes; interference suppression; intersymbol interference; radio links; CDMA systems; Walsh codes; auto-correlation function; cross-correlation function; forward link; inter symbol interference suppression; interference free window; loosely synchronous codes; multiple access interference suppression; reverse link; spreading codes; Australia; Autocorrelation; Delay; Design engineering; Diversity reception; Fading; Interference suppression; Intersymbol interference; Multiaccess communication; Multiple access interference; CDMA; IFW; LS codes; Spreading; Walsh; ZCZ;

fLanguage

English

Publisher

ieee

Conference_Titel

TENCON 2005 2005 IEEE Region 10

Conference_Location

Melbourne, Qld.

Print_ISBN

0-7803-9311-2

Electronic_ISBN

0-7803-9312-0

Type

conf

DOI

10.1109/TENCON.2005.301079

Filename

4084986