NDLI: The Degrees-of-Freedom Region of the MIMO Interference Channel With Shannon Feedback

Content Provider	IEEE Xplore Digital Library
Author	Vaze, C.S. Varanasi, M.K.
Copyright Year	1963
Abstract	The two-user multiple-input multiple-output (MIMO) fast-fading interference channel (IC) with an arbitrary number of antennas at each of the four terminals is studied under the settings of Shannon feedback and output feedback, wherein channel matrices and outputs, or just the channel outputs, respectively, are available to the transmitters with a delay. While for most numbers of antennas at the four terminals, the degree-of-freedom (DoF) regions with Shannon feedback are equal to that with just delayed channel state information (CSIT), it is shown that for the rest of the MIMO ICs, the DoF region with Shannon feedback is strictly larger than the DoF region with just delayed CSIT. To realize these DoF gains with Shannon feedback, a new interference alignment scheme is obtained wherein transmitter cooperation made possible by output feedback (in addition to delayed CSIT) is employed to effect a more efficient form of interference alignment than is feasible with previously known schemes that use just delayed CSIT. The DoF region for output-only feedback is also obtained for all but a class of MIMO ICs that satisfy one of two inequalities involving the numbers of antennas. Moreover, the DoF region for Shannon feedback is shown to be applicable to two limited Shannon feedback settings where the transmitters have knowledge only of certain channel matrices and certain outputs with delay.
Sponsorship	IEEE Information Theory Society
Starting Page	4798
Ending Page	4810
Page Count	13
File Size	3109691
File Format	PDF
ISSN	00189448
Volume Number	59
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Transmitters Integrated circuits Output feedback Receivers Antenna feeds Interference Shannon feedback Degrees of freedom (DoF) delayed channel state information at the transmitters (CSIT) feedback interference alignment (IA) interference channel (IC) multiple-input multiple-output (MIMO)
Content Type	Text
Resource Type	Article
Subject	Library and Information Sciences Information Systems Computer Science Applications

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