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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
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E102-A
No.11
pp.1580-1585 Publication Date: 2019/11/01 Online ISSN: 1745-1337
DOI: 10.1587/transfun.E102.A.1580 Type of Manuscript: LETTER Category: Digital Signal Processing Keyword: K×2 X channel, propagation delay, cyclic interference alignment, degree of freedom, feasibility,
Full Text: FreePDF
Summary:
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.
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