Sum Capacity Optimality of Orthogonal Transmissions in Vector Gaussian Multiple Access Channels

被引：1

作者：

Shang, Xiaohu ^{[1
]}

Chen, Biao ^{[1
]}

Matyjas, John ^{[2
]}

机构：

[1] Syracuse Univ, Dept EECS, Syracuse, NY 13244 USA

[2] AFRL, Rome, NY 13442 USA

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2008年 / 7卷 / 11期

基金：

美国国家科学基金会;

关键词：

Sum capacity; vector Gaussian multiple access channel; frequency division multiple access;

D O I：

10.1109/T-WC.2008.070560

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We study in this paper the sum capacity achievability of orthogonal transmissions in vector Gaussian multiple access channels (MAC). Specifically, we derive sufficient and necessary conditions, in terms of channel matrices and transmitter power constraints, for orthogonal transmissions to achieve the sum capacity of a vector Gaussian MAC. The obtained conditions provide a unified framework that helps explain many intuitive and known results as well as explore cases that have not been addressed. In the cases when these conditions are violated, our results enable us to quantify the suboptimality of orthogonal transmission when the sum capacity can only be achieved by overlay transmission.

引用

页码：4304 / 4311

页数：8

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