Information-Theoretic Limits for the Multi-Way Relay Channel with Direct Links

Yuping SU
Ying LI
Guanghui SONG

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E98-A    No.6    pp.1325-1328
Publication Date: 2015/06/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E98.A.1325
Type of Manuscript: LETTER
Category: Information Theory
multi-way relay channel with direct links,  restricted encoder,  decode-and-forward,  outer bound,  achievable rate region,  

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Information-theoretic limits of a multi-way relay channel with direct links (MWRC-DL), where multiple users exchange their messages through a relay terminal and direct links, are discussed in this paper. Under the assumption that a restricted encoder is employed at each user, an outer bound on the capacity region is derived first. Then, a decode-and-forward (DF) strategy is proposed and the corresponding rate region is characterized. The explicit outer bound and the achievable rate region for the Gaussian MWRC-DL are also derived. Numerical examples are provided to demonstrate the performance of the proposed DF strategy.