Block-Shanno multi-user constant modulus algorithm for use in multi-user CDMA environment

Author

Arasaratnam, P. ; Zhu, S. ; Constantinides, A.G.

Author_Institution

Dept. of Electr. & Electron. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK

Volume

38

Issue

9

fYear

2002

fDate

4/25/2002 12:00:00 AM

Firstpage

423

Lastpage

425

Abstract

In a multi-user direct sequence code division multiple access (DS-CDMA) system, retrieval of transmitted signals with a conventional receiver is difficult when there is chip asynchronism, multipath propagation and the associated near-far problem. Results presented show that despite these problems an adaptive linear receiver based on a mixed cross correlation and constant modulus algorithm (CC-CMA) has the potential to retrieve all users simultaneously. Compared with the conventional CC-CMA algorithm, the proposed algorithm achieves faster convergence. Simulations support the improved convergence properties of the algorithm

Keywords

Newton method; adaptive equalisers; blind equalisers; code division multiple access; convergence of numerical methods; multiuser channels; spread spectrum communication; Block-Shanno multiuser constant modulus algorithm; DS-CDMA; adaptive linear receiver; binary phase-shift keying; blind equalisation; block processing; chip asynchronism; faster convergence; impulse response; mixed cross correlation; modified Newton algorithm; multipath propagation; multiuser CDMA environment; near-far problem; transmitted signals retrieval;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20020165

Filename

1001551