A New Physical-Layer Network Coding Scheme with Eigen-Direction Alignment Precoding for MIMO Two-Way Relaying

We investigate efficient communication over multiple-input multiple-output (MIMO) two-way relay channels (TWRCs), where two multi-antenna users exchange information via a multi-antenna relay. We propose a new MIMO physical-layer network coding (PNC) scheme that includes novel eigen-direction alignme...

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Vydané v:	IEEE transactions on communications Ročník 61; číslo 3; s. 973 - 986
Hlavní autori:	Tao Yang, Xiaojun Yuan, Li Ping, Collings, I. B., Jinhong Yuan
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	New York, NY IEEE 01.03.2013 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:	Alignment Antennas Applied sciences capacity Channels Coding compute-and-forward Downlink Exact sciences and technology Mathematical analysis Mathematical models MIMO Network coding Networks Physical-layer network coding precoding Radiocommunications Relay Relaying Relays Signal to noise ratio Studies Switching and signalling Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Vectors Performance evaluation MIMO system Multiple access Relaying Packet switching Design criterion Relay Physical-layer network coding Eigenmode Two channel system precoding Implementation capacity Upper bound Relay channel Multi-stream approach Network coding Numerical simulation MIMO Pretreatment Antenna compute-and-forward
ISSN:	0090-6778, 1558-0857
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Popis
Shrnutí:	We investigate efficient communication over multiple-input multiple-output (MIMO) two-way relay channels (TWRCs), where two multi-antenna users exchange information via a multi-antenna relay. We propose a new MIMO physical-layer network coding (PNC) scheme that includes novel eigen-direction alignment (EDA) precoding. The proposed EDA precoding efficiently aligns the two-user's eigen-modes into the same set of orthogonal directions, and multiple independent PNC streams are implemented over the aligned eigen-modes. We derive an achievable rate-pair of the proposed scheme, for given EDA precoding parameters, over a MIMO TWRC. To maximize the achievable rate-region, we formulate a design criterion for the EDA precoding parameters, and present solutions to the formulation. Closed-form bounds on the sum-rates of the designed EDA-PNC schemes are derived. Numerical results show that there is only a small gap between the achievable rate of the proposed scheme and the capacity upper bound of the MIMO TWRC. It is shown that the proposed scheme can significantly outperforms existing schemes in the literature.
Bibliografia:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 content type line 23
ISSN:	0090-6778 1558-0857
DOI:	10.1109/TCOMM.2012.010213.120265