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BER Analysis of Weighted Interference Cancellation in Multicarrier DS-CDMA Systems

Manohar, S and Tikiya, V and Annavajjala, R and Chockalingam, A (2006) BER Analysis of Weighted Interference Cancellation in Multicarrier DS-CDMA Systems. In: IEEE Wireless Communications and Networking Conference, APR 03-06, 2006, Las Vegas, NV, pp. 1003-1008.

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In this paper, we present the design and bit error performance analysis of weighted linear parallel interference cancellers (LPIC) for multicarrier (MC) DS-CDMA systems. We propose an LPIC scheme where we estimate (and cancel) the multiple access interference (MAI) based on the soft outputs on individual subcarriers, and the interference cancelled outputs on different subcarriers are combined to form the final decision statistic. We scale the MAI estimate on individual subcarriers by a weight before cancellation; these weights are so chosen to maximize the signal-to-interference ratios at the individual subcarrier outputs. For this weighted LPIC scheme, using an approach involving the characteristic function of the decision variable, we derive exact bit error rate (BER) expressions for different cancellation stages. Using the same approach, we also derive exact BER expressions for the matched filter (MF) and decorrelating detectors for the considered MC DS-CDMA system. We show that the proposed weighted LPIC scheme performs better than the MF detector and the conventional LPIC (where the weights are taken to be unity), and close to the decorrelating detector.

Item Type: Conference Paper
Series.: IEEE Wireless Communications and Networking Conference
Publisher: IEEE
Additional Information: Copyright 2006 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: Parallel interference cancellation; multicarrier DS-CDMA; signal-to-interference ratio; optimum weights
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 07 Mar 2011 05:29
Last Modified: 07 Mar 2011 05:29
URI: http://eprints.iisc.ac.in/id/eprint/35926

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