Asynchronous multiple-access interference suppression and chip waveform selection with aperiodic random sequences

Author

Wong, Tan F. ; Lok, Tat M. ; Lehnert, James S.

Author_Institution

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

Volume

47

Issue

1

fYear

1999

fDate

1/1/1999 12:00:00 AM

Firstpage

103

Lastpage

114

Abstract

A linear decentralized receiver capable of suppressing multiple-access interference (MAI) for asynchronous direct-sequence code-division multiple-access (DS-CDMA) systems with aperiodic random signature sequences is proposed. Performance bounds on this receiver are also obtained. Using them as performance measures, the problem of chip waveform selection in DS-CDMA systems with the proposed receiver under the near-far scenario is investigated. In particular, the performance of several practical chip waveforms is compared. An LMS-type adaptive algorithm is developed to obtain the parameters needed in the receiver, which only requires the signature sequence and coarse timing information of the desired user

Keywords

adaptive signal detection; interference suppression; least mean squares methods; multiuser channels; radio receivers; radiofrequency interference; random processes; sequences; spread spectrum communication; DS-CDMA; LMS-type adaptive algorithm; aperiodic random signature sequences; asynchronous DS-CDMA systems; asynchronous multiple-access interference suppression; chip waveform selection; coarse timing information; linear decentralized receiver; near-far scenario; performance bounds; performance measures; receiver; Adaptive algorithm; Correlators; Interference suppression; Matched filters; Multiaccess communication; Multiple access interference; Multiuser detection; Radio access networks; Random sequences; Spread spectrum communication;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.747817

Filename

747817