An asynchronous multirate decorrelator

Author

Saquib, Mohammad ; Yates, Roy D. ; Ganti, Anand

Author_Institution

Dept. of Electr. & Comput. Eng., Louisiana State Univ., Baton Rouge, LA, USA

Volume

48

Issue

5

fYear

2000

fDate

5/1/2000 12:00:00 AM

Firstpage

739

Lastpage

742

Abstract

This paper examines truncated window decorrelators for an asynchronous direct-sequence code-division multiple-access system supporting users transmitting at different bit rates. We decode a user by extending the observation window over a sufficient number of its bits. To characterize practical window sizes, simple upper and lower bounds for the asymptotic efficiency of both the truncated window and infinite window decorrelators are developed. Empirical results show that as the length of the observation window increases, the bounds converge rapidly to the asymptotic efficiency of the infinite window decorrelator. The complexity of the receiver depends strongly on the ratio of the maximum to minimum bit rates

Keywords

code division multiple access; communication complexity; decorrelation; interference suppression; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; asymptotic efficiency; asynchronous DS-CDMA system; asynchronous multirate decorrelator; infinite window decorrelator; lower bound; maximum to minimum bit rate ratio; multiuser interference suppression; observation window length; receiver complexity; truncated window decorrelator; upper bound; window sizes; Bit rate; Decoding; Decorrelation; Detectors; Gain; H infinity control; Interference suppression; Modulation coding; Multiaccess communication; Telecommunication traffic;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.843182

Filename

843182