Nonlinear correlator for DS/SSMA communications in impulsive channels

Author

Weng, J.F. ; Leung, S.H. ; Lau, W.H. ; Bi, G.G.

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong

Volume

3

fYear

1996

fDate

22-25 Sep 1996

Firstpage

1043

Abstract

A nonlinear correlator for the reception of multiple-access transmissions in impulsive channels is presented. In this detector, a practical performance measure, i.e., the output signal-to-noise ratio, for optimizing the nonlinearity is addressed and a learning algorithm is developed to adjust the nonlinearity in accordance with the noise characteristic. The performance in single- and synchronous two-user channels is evaluated. To further alleviate the “near/far” effect caused by the multiple-access interference, an interference cancellation scheme is incorporated in the detector. Computer simulations show that this new correlator has a robust performance

Keywords

correlators; interference suppression; learning systems; multi-access systems; noise; pseudonoise codes; radiofrequency interference; spread spectrum communication; DS/SSMA communications; computer simulations; detector; impulsive channels; interference cancellation; learning algorithm; multiple access interference; multiple-access transmissions; near/far effect; noise characteristic; nonlinear correlator; output signal to noise ratio; practical performance measure; robust performance; single-user channels; synchronous two-user channels; Correlators; Detectors; Electromagnetic interference; Interference cancellation; Multiple access interference; Noise cancellation; Noise robustness; Signal to noise ratio; System performance; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on

Conference_Location

Mainz

Print_ISBN

0-7803-3567-8

Type

conf

DOI

10.1109/ISSSTA.1996.563464

Filename

563464