NDLI: Interference-Aware RZF Precoding for Multicell Downlink Systems

Content Provider	IEEE Xplore Digital Library
Author	Muller, A. Couillet, R. Bjornson, E. Wagner, S. Debbah, M.
Copyright Year	1991
Abstract	Recently, a structure of an optimal linear precoder for multi cell downlink systems has been described, and many other references have used simplified versions of this precoder to obtain promising performance gains. These gains have been hypothesized to stem from the additional degrees of freedom that allow for interference mitigation through interference relegation to orthogonal subspaces. However, no conclusive or rigorous understanding has yet been developed. In this paper, we build on an intuitive interference induction trade-off and the aforementioned preceding structure to propose an interference aware RZF (iaRZF) precoding scheme for multi cell downlink systems, and we analyze its rate performance. Special emphasis is placed on the induced interference mitigation mechanism of iaRZF. For example, we will verify the intuitive expectation that the precoder structure can either completely remove induced inter-cell or intra-cell interference. We state new results from large-scale random matrix theory that make it possible to give more intuitive and insightful explanations of the precoder behavior, also for cases involving imperfect channel state information (CSI). We remark especially that the interference-aware precoder makes use of all available information about interfering channels to improve performance. Even very poor CSI allows for significant sum-rate gains. Our obtained insights are then used to propose heuristic precoder parameters for arbitrary systems, whose effectiveness are shown in more involved system scenarios. Furthermore, calculation and implementation of these parameters does not require explicit inter base station cooperation.
Sponsorship	IEEE Signal Processing Society
Starting Page	3959
Ending Page	3973
Page Count	15
File Size	3622815
File Format	PDF
ISSN	1053587X
Volume Number	63
Issue Number	15
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Channel estimation Covariance matrices Downlink Electronic mail Signal processing algorithms Limiting random matrix theory Interference mitigation linear precoding multicell downlink multiuser MIMO
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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