NDLI: Adaptive LS-based beamformer design for multiuser MIMO interference channels

Content Provider	IEEE Xplore Digital Library
Author	Razavi, S.M. Ratnarajah, T.
Copyright Year	2014
Description	Author affiliation: Inst. for Digital Commun., Univ. of Edinburgh, Edinburgh, UK (Razavi, S.M.; Ratnarajah, T.)
Abstract	In wireless interference networks, orthogonal medium access techniques like time division multiple access (TDMA) and frequency division multiple access (FDMA) achieve merely one degree of freedom (DoF). However, by using interference alignment (IA) the achievable DoF can be linearly scaled up with the number of users. Nevertheless, this outperformance of IA heavily depends on the availability of perfect channel state information (CSI), which is not a realistic assumption in practice. Since under imperfect CSI, the performance of IA may become severely degraded, design of enhanced IA algorithms by relying on the availability of merely imperfect CSI is of particular interest. In this paper, we propose a least squares (LS)-based IA algorithm which adaptively designs the beamformers based on the knowledge of the channel estimation error variance, which is possible to be known in advance. Then, we compare the performance of the proposed scheme with interference leakage minimization algorithms. It is shown that under both perfect and imperfect CSI, the proposed LS-based IA outperforms interference leakage minimization algorithms.
Starting Page	633
Ending Page	637
File Size	156963
Page Count	5
File Format	PDF
ISBN	9781479949120
DOI	10.1109/PIMRC.2014.7136242
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Channel estimation Receivers Interference channels Algorithm design and analysis Signal to noise ratio
Content Type	Text
Resource Type	Article

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