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http://dx.doi.org/10.7840/kics.2015.40.2.273

Feasibility of Interference Alignment for Reverse Duplex in MIMO Cellular Networks with One-side Base Cooperation  

Kim, Kiyeon (School of Electrical and Electronic Engineering, Yonsei Univ.)
Jeon, Sang-Woon (Department of Information and Communication Engineering, Andong National Univ.)
Yang, Janghoon (Department of Newmedia, Korean German Institute of Technology)
Kim, Dong Ku (School of Electrical and Electronic Engineering, Yonsei Univ.)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.40, no.2, 2015 , pp. 273-284 More about this Journal
Abstract
The feasibility conditions of interference alignment (IA) are analyzed for reverse duplex systems, in which one cell operates as downlink (DL) while the other cell operates as uplink (UL) assuming one-sid base station (BS) cooperation. Under general multiple-input and multiple-output (MIMO) antenna configurations, a necessary condition and a sufficient condition for one-shot linear IA are established, i.e., linear IA without symbol or time extension. In several example networks, optimal sum degrees of freedom (DoF) is characterized by the derived necessary condition and sufficient condition. For some special class of networks, a sufficient condition is established in a more compact expression, which also yields the necessary and sufficient condition. Simulation results demonstrate that the proposed IA does not only achieve larger DoF but also significantly improves the sum rate in the practical signal-to-noise ratio (SNR) regime.
Keywords
MIMO; degrees of freedom; interference alignment; full-duplex; feasibility;
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