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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
Publication Date: 2015/06/01
Online ISSN: 1745-1337
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.