Blind equalization for CDMA systems with aperiodic spreading sequences

Authors:
Hui Liu;Guanghan Xu
Affiliations:
Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA, USA;-
Venue:
ICASSP '96 Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 05
Year:
1996

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Abstract

Multipath induced interchip-interference (ICI) alters waveforms of transmitted signals and presents a major obstacle to direct-sequence (DS) code-division-multiple-access (CDMA) communications. Since practical systems often employ aperiodic pseudorandom (PN) spreading sequences, source separation/equalization based on users signature waveforms may be prohibitive. We consider antenna array CDMA systems with aperiodic PN sequences and present a blind method to estimate the filter coefficients in a standard 2D RAKE receiver. A simple cost function is formulated based on which we derive a least-squares equalizer to effectively suppress both ICI and multiuser interference (MUI) by exploiting the channel diversities.