Linear equalizers for quasi-synchronous block spreading CDMA systems

Authors:
Mohammud Z. Bocus;Yue Wang;Justin P. Coon
Affiliations:
ECE Department, University of Bristol, Bristol, UK;Telecommunication Research Laboratory, Toshiba Research Europe Limited;Telecommunication Research Laboratory, Toshiba Research Europe Limited
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

Citing 2
Cited 2

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Design of spreading codes for quasi-synchronous CDMA with intercell interference

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Channel frequency response estimation for MIMO systems with frequency-domain equalization

EURASIP Journal on Advances in Signal Processing - Special issue on advances in single carrier block modulation with frequency domain processing
Iterative successive interference cancellation for quasi-synchronous block spread CDMA based on the orders of the times of arrival

EURASIP Journal on Advances in Signal Processing - Special issue on advances in single carrier block modulation with frequency domain processing

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Abstract

Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific precoding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates the design of linear frequency domain equalizers to reduce the MUI in a quasi-synchronous BS-CDMA system. An optimal frequency domain linear minimum-mean squared error (LMMSE) equalizer is derived. Further simplification leads to a novel sub-optimal equalizer with reduced computational complexity. It is shown through simulation that the proposed equalizers effectively suppress the error floor due to quasi-synchronous reception when channel coding is applied.