DS-CDMA downlink system capacity enhancement through interference suppression

Author

Wang, Y. P Eric ; Bottomley, Gregory E.

Author_Institution

Ericsson Res., NC

Volume

5

Issue

7

fYear

2006

fDate

7/1/2006 12:00:00 AM

Firstpage

1767

Lastpage

1774

Abstract

In the downlink of direct-sequence code-division multiple-access (DS-CDMA) cellular systems, system capacity is limited by multiuser interference. This interference can be suppressed at the receiver by interference whitening approaches such as chip equalization and generalized RAKE (G-RAKE) reception. In this paper, we show how these advanced receivers can increase system capacity. First, the G-RAKE receiver formulation is extended to include soft handoff and other-cell interference. Then, voice capacity is evaluated, including the effects of fast fading, interference correlation, power control, orthogonality properties of own-cell signals, and soft handoff. Numerical results for the wideband CDMA system show that when the channel is dispersive, advanced receivers improve capacity by 30-34%

Keywords

cellular radio; code division multiple access; interference suppression; power control; radio links; radio receivers; radiofrequency interference; spread spectrum communication; telecommunication control; DS-CDMA; cellular systems; chip equalization; direct-sequence code-division multiple-access; downlink system capacity enhancement; generalized RAKE reception; interference correlation; interference suppression; interference whitening; multiuser interference; orthogonality properties; own-cell signals; power control; receivers; soft handoff; wideband CDMA system; Base stations; Downlink; Fading; Interference suppression; Multiaccess communication; Multipath channels; Multiple access interference; Power control; RAKE receivers; Wideband;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2006.1673088

Filename

1673088