Loosely synchronised spreading code aided network performance of quasi-synchronous UTRA-like TDD and FDD CDMA systems

Author

Ni, S. ; Wei, H. ; Hanzo, L.

Author_Institution

Sch. of Electron. & Comput. Sci., Univ. of Southampton, UK

Volume

41

Issue

15

fYear

2005

fDate

7/21/2005 12:00:00 AM

Firstpage

861

Lastpage

863

Abstract

It is demonstrated that loosely synchronised (LS) spreading codes exhibit a so-called interference-free window, where both the autocorrelation and cross-correlation of the codes become zero. Therefore LS codes have the promise of mitigating the effects of both inter-symbol-interference and multiple-access-interference in time dispersive channels. Hence, LS codes have the potential of increasing the capacity of CDMA networks. The work reported has studied the achievable network performance and compared it to that of a UTRA-like time division duplex (TDD) and frequency division duplex (FDD) CDMA system using orthogonal variable rate spreading factor codes.

Keywords

code division multiple access; correlation methods; dispersive channels; frequency division multiplexing; interference suppression; intersymbol interference; radio access networks; synchronisation; time division multiplexing; variable rate codes; CDMA networks; FDD CDMA systems; autocorrelation; cross-correlation; frequency division duplex; interference free window; intersymbol interference; loosely synchronised spreading code; multiple access interference; orthogonal variable rate spreading factor codes; quasisynchronous UTRA TDD; time dispersive channels; time division duplex;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20051432

Filename

1487752