DocumentCode :
640102
Title :
Asymptotic sum-capacity of MIMO two-way relay channels within 1/2 log 5/4 bit per user-antenna
Author :
Xiaojun Yuan ; Tao Yang
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Hong Kong, China
fYear :
2013
fDate :
7-12 July 2013
Firstpage :
1317
Lastpage :
1321
Abstract :
We propose a novel space-division based network-coding scheme for multiple-input multiple-output (MIMO) two-way relay channels (TWRCs), in which two multi-antenna users exchange information via a multi-antenna relay. In the proposed scheme, the overall signal space at the relay is divided into two subspaces. In one subspace, the spatial streams of the two users have nearly orthogonal directions, and are completely decoded at the relay. In the other subspace, the signal directions of the two users are nearly parallel, and linear functions of the spatial streams are computed at the relay, following the principle of physical-layer network coding (PNC). Based on the recovered messages and message-functions, the relay generates and forwards network-coded messages to the two users. We show that, at high signal-to-noise ratio (SNR), the proposed scheme with optimized precoding achieves the asymptotic sum-rate capacity of MIMO TWRCs within 1/2 log(5/4) ≈ 0.161 bit per user-antenna, for any antenna configuration and any channel realization.
Keywords :
MIMO communication; antenna arrays; network coding; precoding; relay networks (telecommunication); MIMO two-way relay channels; PNC; TWRCs; antenna configuration; asymptotic sum-capacity; asymptotic sum-rate capacity; channel realization; message-functions; multiantenna relay; multiple-input multiple-output channel; network-coded messages; optimized precoding; physical-layer network coding; signal-to-noise ratio; space-division based network-coding scheme; Antennas; MIMO; Network coding; Relays; Signal to noise ratio; Vectors; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory Proceedings (ISIT), 2013 IEEE International Symposium on
Conference_Location :
Istanbul
ISSN :
2157-8095
Type :
conf
DOI :
10.1109/ISIT.2013.6620440
Filename :
6620440
Link To Document :
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