Theoretical analysis of the orthogonality factor in WCDMA downlinks

Author

Hamdi, Khairi Ashour

Author_Institution

Sch. of Electr. & Electron. Eng., Univ. of Manchester, Manchester, UK

Volume

8

Issue

11

fYear

2009

fDate

11/1/2009 12:00:00 AM

Firstpage

5394

Lastpage

5399

Abstract

Wideband code-division multiaccess (WCDMA) downlink transmission is prone to self interference caused by the loss of orthogonality between the spreading codes due to multipath fading. The degree of loss of orthogonality in downlink WCDMA is usually measured in terms of the orthogonality factor (OF) which is directly related to the level of intra-cell interference. This paper presents accurate theoretical analysis of the OF over generalized fading channels. New exact expressions of the average OF are derived for full and partial RAKE receivers over arbitrarily correlated multipath fading channels.

Keywords

broadband networks; code division multiple access; fading channels; interference (signal); multipath channels; radio receivers; RAKE receivers; WCDMA downlink transmission; intra-cell interference; multipath fading channels; orthogonality factor; spreading codes; wideband code-division multiaccess downlink transmission; Downlink; Fading; Interference; Land mobile radio cellular systems; Loss measurement; Multiaccess communication; Multipath channels; Propagation losses; Random variables; Reactive power; Code division multiaccess, fading channels, land mobile radio cellular systems, multiuser channels.;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2009.081101

Filename

5336759