Performance of an LMS type receiver for interference suppression in long code DS-CDMA on Rayleigh fading channels

Chockalingam, A and Kumar, Shankar KR and Milstein, LB (2000) Performance of an LMS type receiver for interference suppression in long code DS-CDMA on Rayleigh fading channels. In: Proceedings of IEEE International Conference on Communications, 18-22 June 2000, New Orleans, LA, USA, pp. 1588-1592.

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Abstract

We consider interference suppression for direct sequence code division multiple access systems when long codes are used for spreading. In particular, we evaluate the performance of a least mean square (LMS) type adaptive receiver on AWGN and correlated Rayleigh fading channels. The receiver uses a chip matched filter followed by an adaptive equalizer structure which performs despreading and interference suppression. The receiver requires only the knowledge of the long code and timing of the desired user. The probability of the error performance of the long code LMS (LC-LMS) receiver is estimated for varying degrees of near-far ratio (NFR), mobile user speed (equivalently, the Doppler bandwidth), and long code period (expressed in number of information bits). Performance results indicate that the given adaptive receiver outperforms the conventional linear correlation receiver by a considerable margin in high NFR and low mobility (i.e., small Doppler bandwidth) scenarios

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	adaptive equalisers;AWGN channels;code division multiple access;codes;correlation methods;error statistics;interference suppression;land mobile radio;least mean squares methods;matched filters;multipath channels;multiuser channels;radio receivers;radiofrequency interference;Rayleigh channels;spread spectrum communication
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	27 Jul 2007
Last Modified:	19 Sep 2010 04:36
URI:	http://eprints.iisc.ac.in/id/eprint/10355

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