Interference alignment and degrees of freedom of the K-user interference channel

被引：2231

作者：

Cadambe, Viveck R. ^{[1
]}

Jafar, Syed Ali ^{[1
]}

机构：

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

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 2008年 / 54卷 / 08期

基金：

美国国家科学基金会;

关键词：

capacity; degrees of freedom; interference alignment; interference channel; multiple-input-multiple-output (MIMO); multiplexing;

D O I：

10.1109/TIT.2008.926344

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

For the fully connected K user wireless interference channel where the channel coefficients are time-varying and are drawn from a continuous distribution, the sum capacity is characterized as C(SNR) = K/2 log(SNR) + o(log(SNR)). Thus, the K user time-varying interference channel almost surely has K/2 degrees of freedom. Achievability is based on the idea of interference alignment. Examples are also provided of fully connected K user interference channels with constant (not time-varying) coefficients where the capacity is exactly achieved by interference alignment at all SNR values.

引用

页码：3425 / 3441

页数：17

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