Degrees of Freedom on the MIMO Y Channel : Signal Space Alignment for Network Coding
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- Title
- Degrees of Freedom on the MIMO Y Channel : Signal Space Alignment for Network Coding
- Authors
- Lee, N; Lim, JB; Chun, J
- Date Issued
- 2010-07
- Publisher
- IEEE
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37788
- DOI
- 10.1109/TIT.2010.2048486
- ISSN
- 0018-9448
- Article Type
- Article
- Citation
- IEEE Transactions on Information Theory, vol. 56, no. 7, page. 3332 - 3342, 2010-07
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