NDLI: Degrees of freedom of the rank-deficient MIMO X channel

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Degrees of freedom of the rank-deficient MIMO X channel

Content Provider	IEEE Xplore Digital Library
Author	Agustin, A. Vidal, J.
Copyright Year	2013
Description	Author affiliation: Dept. of Signal Theor. & Commun., Univ. Politec. de Catalunya (UPC), Barcelona, Spain (Agustin, A.; Vidal, J.)
Abstract	The multiple-input multiple-output (MIMO) X channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer bound which is attained by the proposed precoding scheme. The total DoF are described in closed-form when all transmitters and receivers have M and N antennas, respectively. For an arbitrary number of antennas, the total DoF are obtained as solution of a linear programming problem. Results elucidate that, unlike point-to-point MIMO systems where DoF increase with the rank of the channel, the total DoF in a multipoint-to-multipoint MIMO system can increase up to a certain point if channels are rank-deficient. Hence, we corroborate the relevance of knowing the rank-deficiency in the MIMO X channel, a property already observed in the MIMO Interference channel.
Starting Page	1
Ending Page	5
File Size	251833
Page Count	5
File Format	PDF
ISBN	9781479913213
e-ISBN	9781479913237
DOI	10.1109/ITW.2013.6691303
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-09
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitting antennas Receiving antennas Interference MIMO
Content Type	Text
Resource Type	Article

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