On the Equal-Rate Capacity of the AWGN Multiway Relay Channel

Abstract

The L-user additive white Gaussian noise multiway relay channel is investigated, where L users exchange information at the same rate through a single relay. A new achievable rate region, based on the functional-decode-forward coding strategy, is derived. For the case where there are three or more users, and all nodes transmit at the same power, the capacity is obtained. For the case where the relay power scales with the number of users, it is shown that both compress-forward and functional-decode-forward achieve rates within a constant number of bits of the capacity at all SNR levels; in addition, functional-decode-forward outperforms compress-forward and complete-decode-forward at high SNR levels.

arXiv commentAuthor's final version (to appear in IEEE Transactions on Information Theory)

References in corpus (2)

• The Capacity Region of Multiway Relay Channels Over Finite Fields with Full Data Exchange
• An Optimal Coding Strategy for the Binary Multi-Way Relay Channel

Cited by in corpus (7)

• Approximate Sum-Capacity of the Y-channel
• Optimal Coding Schemes for the Three-Receiver AWGN Broadcast Channel with Receiver Message Side Information
• The Multi-Sender Multicast Index Coding
• Coding Schemes for a Class of Receiver Message Side Information in AWGN Broadcast Channels
• Degrees-of-Freedom of the MIMO Three-Way Channel with Node-Intermittency
• A Unified Inner Bound for the Two-Receiver Memoryless Broadcast Channel with Channel State and Message Side Information
• Optimal Coding Functions for Pairwise Message Sharing on Finite-Field Multi-Way Relay Channels