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A General Perfect Cyclic Interference Alignment by Propagation Delay for Arbitrary X Channels with Two Receivers
Conggai LI Feng LIU Shuchao JIANG Yanli XU
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2019/11/01
Online ISSN: 1745-1337
Type of Manuscript: LETTER
Category: Digital Signal Processing
K×2 X channel, propagation delay, cyclic interference alignment, degree of freedom, feasibility,
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Interference alignment (IA) in temporal domain is important in the case of single-antenna vehicle communications. In this paper, perfect cyclic IA based on propagation delay is extended to the K×2 X channels with two receivers and arbitrary transmitters K≥2, which achieves the maximal multiplexing gain by obtaining the theoretical degree of freedom of 2K/(K+1). We deduce the alignment and separability conditions, and propose a general scheme which is flexible in setting the index of time-slot for IA at the receiver side. Furthermore, the feasibility of the proposed scheme in the two-/three- Euclidean space is analyzed and demonstrated.