Title :
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
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;
Conference_Titel :
TENCON 2005 2005 IEEE Region 10
Conference_Location :
Melbourne, Qld.
Print_ISBN :
0-7803-9311-2
Electronic_ISBN :
0-7803-9312-0
DOI :
10.1109/TENCON.2005.301079
