Degrees of Freedom of Asymmetrical Multi-Way Relay Networks

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Abstract

In this paper, we introduce an asymmetrical multi-way relay channel where a base station conveys independent symbols to K different users while receiving independent symbols from the users. In this network, user i Shas Mi antennas (i ∈ [1, ..., K]), the base station has Σi=1K Mi antennas and the relay is equipped with NR antennas. To study the capacity of this network, the degree of freedom (DOF) is characterized to be 2 Σi=1K Mi if NR ≥ Σi=1K Mi. The DOF implies that the number of symbols any transmitter can deliver and receive is equivalent to its number of antennas. The DOF is achievable with a proposed joint multiple access and broadcast precoding design using the signal space alignment concept.
Original languageEnglish
JournalI E E E Workshop on Signal Processing Advances in Wireless Communications. Proceedings
Pages (from-to)516-520
Number of pages5
ISSN1242-5125
DOIs
Publication statusPublished - Jun 2011

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