Campus Units
Electrical and Computer Engineering
Document Type
Article
Publication Version
Submitted Manuscript
Publication Date
6-2012
Journal or Book Title
IEEE Transactions on Information Theory
Volume
58
Issue
6
First Page
3766
Last Page
3779
DOI
10.1109/TIT.2012.2185483
Abstract
We study the degrees of freedom (DoF) regions of two-user multiple-input multiple-output Z and full interference channels in this paper. We assume that the receivers always have perfect channel state information. We first derive the DoF region of Z interference channel with channel state information at transmitter (CSIT). For full interference channel without CSIT, the DoF region has been fully characterized recently and it is shown that the previously known outer bound is not achievable. In this paper, we investigate the no-CSIT case further by assuming that one transmitter has the ability of antenna mode switching. We obtain the DoF region as a function of the number of available antenna modes and reveal the incremental gain in DoF that each additional antenna mode can bring. It is shown that, in certain cases, the reconfigurable antennas can increase the DoF. In these cases, the DoF region is maximized when the number of modes is at least equal to the number of receive antennas at the corresponding receiver, in which case the previous outer bound is achieved. In all cases, we propose systematic constructions of the beamforming and nulling matrices for achieving the DoF region. The constructions bear an interesting space-frequency coding interpretation.
Rights
© 2012 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.
Copyright Owner
IEEE
Copyright Date
2012
Language
en
File Format
application/pdf
Recommended Citation
Ke, Lei and Wang, Zhengdao, "Degrees of Freedom Regions of Two-User MIMO Z and Full Interference Channels: The Benefit of Reconfigurable Antennas" (2012). Electrical and Computer Engineering Publications. 279.
https://lib.dr.iastate.edu/ece_pubs/279
Comments
This is a manuscript of an article published as Ke, Lei, and Zhengdao Wang. "Degrees of freedom regions of two-user MIMO Z and full interference channels: The benefit of reconfigurable antennas." IEEE Transactions on Information Theory 58, no. 6 (2012): 3766-3779. DOI: 10.1109/TIT.2012.2185483. Posted with permission.