Interference Alignment Algorithms for the K User Constant MIMO Interference Channel

Mohapatra, Parthajit and Nissar, KE and Murthy, Chandra R (2011) Interference Alignment Algorithms for the K User Constant MIMO Interference Channel. In: IEEE Transactions on Signal Processing, 59 (11). pp. 5499-5508.

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Abstract

This paper considers the degrees of freedom (DOF) for a K user multiple-input multiple-output (MIMO) M x N interference channel using interference alignment (IA). A new performance metric for evaluating the efficacy of IA algorithms is proposed, which measures the extent to which the desired signal dimensionality is preserved after zero-forcing the interference at the receiver. Inspired by the metric, two algorithms are proposed for designing the linear precoders and receive filters for IA in the constant MIMO interference channel with a finite number of symbol extensions. The first algorithm uses an eigenbeamforming method to align sub-streams of the interference to reduce the dimensionality of the interference at all the receivers. The second algorithm is iterative, and is based on minimizing the interference leakage power while preserving the dimensionality of the desired signal space at the intended receivers. The improved performance of the algorithms is illustrated by comparing them with existing algorithms for IA using Monte Carlo simulations.

Item Type:	Journal Article
Publication:	IEEE Transactions on Signal Processing
Publisher:	IEEE
Additional Information:	Copyright 2011 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:	Degrees of freedom;interference alignment;interference channels;precoder design
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	21 Dec 2011 09:51
Last Modified:	21 Dec 2011 09:51
URI:	http://eprints.iisc.ac.in/id/eprint/42615

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