Multiuser detection in multirate DS/CDMA communications

Author

Chen, Ming ; Li, Yueheng

Author_Institution

Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China

Volume

1

fYear

2000

fDate

2000

Firstpage

583

Abstract

In this paper, multiuser detection in multirate long-code DS/CDMA systems is considered. Regarding the slower transmission rate of a symbol in the system as repeated transmission of the symbol at the fastest rate in the system, we reduce the multirate transmission model to a single-rate one with repeated transmission of symbols which can be viewed as a binary repetition code or a form of time-diversity signaling. Thus, traditional multiuser detection for single-rate encoded data can be applied. Several typical multiuser detection methods, such as decorrelating, MMSE and parallel interference cancellation (PIC), are investigated for multirate systems. An integrated preconditioned soft decision PIC (PSD-PIC) structure is proposed to improve the performance of partitioned decorrelating (or MMSE) multirate detector. Numerical simulations show that the performance of integrated PSD-PIC is better than that of integrated hard decision PIC (HD-PIC) for multirate systems

Keywords

binary codes; cellular radio; code division multiple access; decorrelation; diversity reception; interference suppression; least mean squares methods; maximum likelihood detection; multiuser channels; radiofrequency interference; signal detection; spread spectrum communication; MMSE detector; binary repetition code; integrated PSD-PIC; integrated hard decision PIC; integrated preconditioned soft decision PIC; maximum likelihood detection; multirate DS/CDMA communications; multirate long-code; multirate transmission model; multiuser access interference; multiuser detection; numerical simulations; parallel interference cancellation; partitioned decorrelating multirate detector; performance; repeated symbol transmission; single-rate encoded data; third generation cellular mobile systems; time-diversity signaling; transmission rate; Decorrelation; Detectors; Interference cancellation; Maximum likelihood decoding; Maximum likelihood detection; Mobile communication; Multiaccess communication; Multiple access interference; Multiuser detection; Numerical simulation;

fLanguage

English

Publisher

ieee

Conference_Titel

MILCOM 2000. 21st Century Military Communications Conference Proceedings

Conference_Location

Los Angeles, CA

Print_ISBN

0-7803-6521-6

Type

conf

DOI

10.1109/MILCOM.2000.905030

Filename

905030