Performance analysis of an adaptive decision-feedback receiver in asynchronous CDMA systems

Author

Liu, Yong ; Wong, Tan F.

Author_Institution

Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA

Volume

2

fYear

2002

fDate

37316

Firstpage

531

Abstract

The performance of several linear multiuser receivers including the matched filter receiver, the decorrelator receiver, and the MMSE receiver has been analyzed in CDMA systems with random sequences. Little work has been done for nonlinear decision feedback receivers. In this paper, we extend the results for linear multiuser receivers to an asynchronous CDMA system with an adaptive decision-feedback detector (DFD). The performance of the DFD using both deterministic sequences and random sequences is analyzed. With the assumption of perfect feedback (i.e., the receiver always makes correct decisions), the feedback part of the adaptive DFD can suppress the interference due to the previous symbols of all users completely and correspondingly the user capacity of the whole system increases greatly when compared with a system using an MMSE receiver.

Keywords

adaptive systems; cellular radio; code division multiple access; feedback; interference suppression; multiuser channels; radio receivers; radiofrequency interference; sequences; signal detection; spread spectrum communication; AWGN channel; MMSE receiver; adaptive decision-feedback detector; adaptive decision-feedback receiver; additive white Gaussian noise channel; asynchronous CDMA systems; decorrelator receiver; deterministic sequences; interference suppression; linear multiuser receivers; matched filter receiver; multiuser detection; nonlinear decision feedback receiver; perfect feedback; performance analysis; random sequences; single-cell DS-CDMA system; user capacity; Adaptive systems; Decorrelation; Design for disassembly; Detectors; Feedback; Interference suppression; Matched filters; Multiaccess communication; Performance analysis; Random sequences;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE

Print_ISBN

0-7803-7376-6

Type

conf

DOI

10.1109/WCNC.2002.993324

Filename

993324