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Abstract: In this paper, taking the view that a linear parallel interference cancellerLPIC can be seen as a linear matrix filter, we propose new linear matrixfilters that can result in improved bit error performance compared to otherLPICs in the literature. The motivation for the proposed filters arises fromthe possibility of avoiding the generation of certain interference and noiseterms in a given stage that would have been present in a conventional LPICCLPIC. In the proposed filters, we achieve such avoidance of the generationof interference and noise terms in a given stage by simply making the diagonalelements of a certain matrix in that stage equal to zero. Hence, the proposedfilters do not require additional complexity compared to the CLPIC, and theycan allow achieving a certain error performance using fewer LPIC stages. Wealso extend the proposed matrix filter solutions to a multicarrier DS-CDMAsystem, where we consider two types of receivers. In one receiver referred toas Type-I receiver, LPIC is performed on each subcarrier first, followed bymulticarrier combining MCC. In the other receiver called Type-II receiver,MCC is performed first, followed by LPIC. We show that in both Type-I andType-II receivers, the proposed matrix filters outperform other matrix filters.Also, Type-II receiver performs better than Type-I receiver because of enhancedaccuracy of the interference estimates achieved due to frequency diversityoffered by MCC.

Autor: T. Srikanth, K. Vishnu Vardhan, A. Chockalingam, L. B. Milstein


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