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Entropy 2012, 14(10), 1842-1863; doi:10.3390/e14101842
Review

A Survey on Interference Networks: Interference Alignment and Neutralization

1
 and
1,2,*
1 School of Computer and Communication Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland 2 Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA
* Author to whom correspondence should be addressed.
Received: 20 July 2012 / Revised: 6 September 2012 / Accepted: 21 September 2012 / Published: 28 September 2012
(This article belongs to the Special Issue Information Theory Applied to Communications and Networking)
Download PDF [249 KB, 24 February 2015; original version 24 February 2015]

Abstract

In recent years, there has been rapid progress on understanding Gaussian networks with multiple unicast connections, and new coding techniques have emerged. The essence of multi-source networks is how to efficiently manage interference that arises from the transmission of other sessions. Classically, interference is removed by orthogonalization (in time or frequency). This means that the rate per session drops inversely proportional to the number of sessions, suggesting that interference is a strong limiting factor in such networks. However, recently discovered interference management techniques have led to a paradigm shift that interference might not be quite as detrimental after all. The aim of this paper is to provide a review of these new coding techniques as they apply to the case of time-varying Gaussian networks with multiple unicast connections. Specifically, we review interference alignment and ergodic interference alignment for multi-source single-hop networks and interference neutralization and ergodic interference neutralization for multi-source multi-hop networks. We mainly focus on the “degrees of freedom” perspective and also discuss an approximate capacity characterization.
Keywords: approximate capacity; degrees of freedom; Gaussian networks; interference alignment; interference neutralization; multiple unicast approximate capacity; degrees of freedom; Gaussian networks; interference alignment; interference neutralization; multiple unicast
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Jeon, S.-W.; Gastpar, M. A Survey on Interference Networks: Interference Alignment and Neutralization. Entropy 2012, 14, 1842-1863.

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