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

被引：191
|
作者：
Lee, Namyoon [1 ]
Lim, Jong-Bu [1 ]
Chun, Joohwan [2 ]
机构：
[1] Samsung Elect Co Ltd, SAIT, Yongin 446712, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Elect Engn, Taejon 305701, South Korea
来源：
IEEE TRANSACTIONS ON INFORMATION THEORY | 2010年 / 56卷 / 07期
关键词：
Degrees of freedom; interference alignment; multiple-input-multiple-output (MIMO) Y channel; network coding; INTERFERENCE ALIGNMENT; COMMUNICATION; REGION;
D O I：
10.1109/TIT.2010.2048486
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
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.
引用
收藏
页码：3332 / 3342
页数：11
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