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Improved linear parallel interference cancellers

Srikanth, T and Vishnu Vardhan, K and Chockalingam, A and Milstein, LB (2008) Improved linear parallel interference cancellers. In: IEEE Transaction on Wireless Communications, 7 (9). pp. 3535-3545.

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Abstract

In this paper, taking the view that a linear parallel interference canceller (LPIC) can be seen as a linear atrix filter, we propose new linear matrix filters that can result in improved bit error performance compared to other LPICs in the literature.The motivation for the proposed filters arises from the possibility of avoiding the generation of certain interference and noise terms in a given stage that would have been present in a conventional LPIC (CLPIC). In the proposed filters, we achieve such avoidance of the generation of interference and noise terms in a given stage by simply making the diagonal elements of a certain matrix in that stage equal to zero. Hence, the proposed filters do not require additional complexity compared to the CLPIC, and they can allow achieving a certain error performance using fewer LPIC stages. We also extend the proposed matrix filter solutions to a multicarrier DS-CDMA system, where we consider two types of receivers. In one receiver (referred to as Type-I receiver), LPIC is performed on each subcarrier first, followed by multicarrier combining (MCC). In the other receiver (called Type-II receiver), MCC is performed first, followed by LPIC. We show that in both Type-I and Type-II receivers, the proposed matrix filters outperform other matrix filters. Also, Type-II receiver performs better than Type-I receiver because of enhanced accuracy of the interference estimates achieved due to frequency diversity offered by MCC.

Item Type: Journal Article
Additional Information: Copyright 2008 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: Linear parallel interference cancellation;linear matrix filters;decorrelating detector;MMSE detector;multicarrier DS-CDMA.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 25 Nov 2008 07:57
Last Modified: 19 Sep 2010 04:52
URI: http://eprints.iisc.ernet.in/id/eprint/16560

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