Degrees of Freedom of the MIMO Y Channel: Signal Space Alignment for Network Coding

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In this paper, we study a network information flow problem for a multiple-input-multiple-output (MIMO) Gaussian wireless network with three users each equipped with M antennas and a single intermediate relay equipped with N antennas. In this network, each user intends to convey independent messages for two different users via the intermediate relay while receiving two independent messages from the other two users. This is a generalized version of the two-way relay channel for the three-user case. We will call it a "MIMO Y channel." For this MIMO Y channel, we show that the capacity is 3M log(SNR) + o(log(SNR)) if N >= [3M/2] by using two novel signaling techniques, which are signal space alignment for network coding, and network-coding-aware interference nulling beamforming.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2010-07
Language
English
Article Type
Article
Keywords

INTERFERENCE CHANNEL; COMMUNICATION; REGION

Citation

IEEE TRANSACTIONS ON INFORMATION THEORY, v.56, no.7, pp.3332 - 3342

ISSN
0018-9448
DOI
10.1109/TIT.2010.2048486
URI
http://hdl.handle.net/10203/100284
Appears in Collection
EE-Journal Papers(저널논문)
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