NDLI: On the Achievable Degrees of Freedom of Two-Cell Multiuser MIMO Interference Networks

Content Provider	IEEE Xplore Digital Library
Author	Hsin-Jui Chou Che-Chen Chou Jen-Ming Wu Chang, R.Y.
Copyright Year	1972
Abstract	In this paper, we study the sum degrees of freedom (DoF) of an uplink two-cell multiuser MIMO interference network with asymmetric number of users in the cells. The achievable DoF is devised based on a two-dimensional space-time spreading code framework with linear precoding/decoding design and finite channel extension. The derivation of the achievable DoF is shown related to a rank minimization problem, which corresponds to the minimization of the dimension of the interference subspace. The problem is solved by the proposed grouping algorithm (GA) based on aligning interfering signals into a low-dimensional subspace as a group and attaining the minimum number of groups. The achievable sum DoF derived based on the proposed GA is shown to be greater than prior arts and achieves the theoretic upper bound in several cases. We also give a closed-form expression of the maximum achievable sum DoF when there is the maximum number of admissible users in the considered finite diversity environment.
Starting Page	2880
Ending Page	2893
Page Count	14
File Size	1432363
File Format	PDF
ISSN	00906778
Volume Number	62
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
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 MIMO Decoding Encoding Vectors Uplink Minimization grouping algorithm Degrees of freedom interference alignment multiuser MIMO cellular networks
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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