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Title: Degrees of freedom of the three-user rank-deficient MIMO interference channel
Authors: Xu, Xiaoli
Zeng, Yong
Guan, Yong Liang
Wang, Chenwei
Gunawan, Erry
Keywords: DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems
Issue Date: 2014
Source: Zeng, Y., Xu, X., Guan, Y. L., Gunawan, E. & Wang, C. (2014). Degrees of freedom of the three-user rank-deficient MIMO interference channel. IEEE transactions on wireless communications, 13(8), 4179 - 4192.
Series/Report no.: IEEE transactions on wireless communications
Abstract: We provide the degrees of freedom (DoF) characterization for the three-user MT × MR multiple-input-multipleoutput (MIMO) interference channel (IC) with rank-deficient channel matrices, where each transmitter is equipped with MT antennas and each receiver with MR antennas, and the interfering channel matrices from each transmitter to the other two receivers are of ranks D1 and D2, respectively. One important intermediate step for both the converse and achievability arguments is to convert the fully-connected rank-deficient channel into an equivalent partially-connected full-rank MIMO-IC by invertible linear transformations. As such, existing techniques developed for full-rank MIMO-IC can be incorporated to derive the DoF outer and inner bounds for the rank-deficient case. Our result shows that when the interfering links are weak in terms of the channel ranks, i.e., D1 + D2 ≤ min(MT, MR), zero forcing is sufficient to achieve the optimal DoF. On the other hand, when D1 + D2 > min(MT , MR), a combination of zero forcing and interference alignment is in general required for DoF optimality. The DoF characterization obtained in this paper unifies several existing results in the literature.
ISSN: 1536-1276
DOI: 10.1109/TWC.2014.2315037
Rights: © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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