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

页码：3332 / 3342

页数：11

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