Channel estimation for synchronous DS-CDMA downlink

Author

Weiss, Anthony ; Friedlander, Benjamin

Author_Institution

Dept. of Electr. Eng. Syst., Tel Aviv Univ., Israel

fYear

1998

fDate

14-16 Sep 1998

Firstpage

284

Lastpage

287

Abstract

Synchronous code-division multiple-access (CDMA) techniques possess intrinsic protection against co-channel interference due to the orthogonal spreading codes used. However in the presence of multipath the signals lose their orthogonality property leading to increased cross-correlation. In these cases channel estimation may be needed in order to improve the detection of the desired symbols. We propose a subspace-based algorithm for blind channel estimation of a synchronous CDMA downlink. We compare the channel estimation accuracy with the Cramer Rao bound and we show that the estimation accuracy can be increased considerably using a decision feedback approach

Keywords

blind equalisers; cochannel interference; code division multiple access; correlation theory; decision feedback equalisers; interference suppression; mobile radio; multipath channels; signal detection; spread spectrum communication; Cramer Rao bound; blind channel estimation; channel estimation; co-channel interference; code-division multiple-access; cross-correlation; decision feedback approach; downlink; mobile radio; multipath; orthogonal spreading codes; subspace-based algorithm; symbol detection; synchronous DS-CDMA downlink; Algorithm design and analysis; Channel estimation; Code division multiplexing; Cramer-Rao bounds; Downlink; Feedback; Interchannel interference; Multiaccess communication; Multicast algorithms; Protection;

fLanguage

English

Publisher

ieee

Conference_Titel

Statistical Signal and Array Processing, 1998. Proceedings., Ninth IEEE SP Workshop on

Conference_Location

Portland, OR

Print_ISBN

0-7803-5010-3

Type

conf

DOI

10.1109/SSAP.1998.739390

Filename

739390