Capacity of the linear decorrelating detector for QS-CDMA

Author

Ghauri, Irfan ; Iltis, Ronald A.

Author_Institution

Dept. of Mobile Commun., Eurecom Inst., Sophia Antipolis, France

Volume

45

Issue

9

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

1039

Lastpage

1042

Abstract

We study the performance and capacity of a quasi-synchronous code-division multiple-access (QS-CDMA) cellular system employing the decorrelating detector. It is assumed that each of N users has a GPS generated local clock, and attempts to transmit in synchrony with the other users in its cell. The detector makes use of the small timing uncertainties to build the interference signal space and perfectly cancel the interference. Results are compared with those of an adaptive MSE receiver. It is shown that when the LMS adaptive algorithm is employed, the mean-squared-error misadjustment significantly affects the receiver performance. Finally, system capacities in terms of users/cell are evaluated

Keywords

cellular radio; code division multiple access; correlation methods; interference suppression; land mobile radio; radio receivers; radiofrequency interference; synchronisation; GPS generated local clock; LMS adaptive algorithm; QS-CDMA; capacity; interference signal space; linear decorrelating detector; mean-squared-error misadjustment; performance; quasi-synchronous code-division multiple-access cellular system; receiver performance; timing uncertainties; Clocks; Decorrelation; Detectors; Global Positioning System; Interference cancellation; Least squares approximation; Multiaccess communication; Synchronization; Timing; Uncertainty;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.623067

Filename

623067