On Degrees of Freedom Region of MIMO Networks Without Channel State Information at Transmitters

被引：115

作者：

Huang, Chiachi ^{[1
]}

Jafar, Syed Ali ^{[1
]}

Shamai, Shlomo ^{[3
]}

Vishwanath, Sriram ^{[2
]}

机构：

[1] Univ Calif Irvine, Dept Elect Engn & Comp Sci, Irvine, CA 92697 USA

[2] Univ Texas Austin, Dept Elect Engn, Wireless Networking & Commun Grp, Austin, TX 78712 USA

[3] Technion Israel Inst Technol, Dept Elect Engn, Technion, Haifa, Israel

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 2012年 / 58卷 / 02期

基金：

以色列科学基金会;

关键词：

Broadcast channel; degrees of freedom (DoF); interference alignment; interference channel; multiple-input-multiple-output (MIMO); BROADCAST CHANNELS; SUM CAPACITY;

D O I：

10.1109/TIT.2011.2173615

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

We study the effect of the absence of channel knowledge at the transmitters for multiple-input-multiple-output (MIMO) networks. Specifically, we assume perfect channel state information at the receivers, no channel state information at the transmitter(s), and independent identically distributed (i.i.d.) Rayleigh fading across antennas, users and time slots. We provide the characterization of the degrees of freedom (DoF) region for a 2-user MIMO broadcast channel. We then provide a DoF region outer bound for a 2-user MIMO interference channel. This bound is shown to be tight for all possible combinations of the number of antennas at each node except for one case. To analyze the unsolved case, we point out the potential of interference alignment in the 2-user MIMO interference channel with no channel state information at the transmitters. As a byproduct, we explore a special class of MIMO broadcast channels where the capacity region is established by using the outer bound developed in the DoF analysis.

引用

页码：849 / 857

页数：9

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