On the Sum-Capacity of Degraded Gaussian Multiple-Access Relay Channels

被引：16

作者：

Sankar, Lalitha ^{[1
]}

Mandayam, Narayan B. ^{[2
]}

Poor, H. Vincent ^{[1
]}

机构：

[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[2] Rutgers State Univ, WINLAB, Technol Ctr NJ, N Brunswick, NJ 08902 USA

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 2009年 / 55卷 / 12期

基金：

美国国家科学基金会;

关键词：

Gaussian and degraded Gaussian MARC; multiple-access relay channel (MARC); polymatroids; sum-capacity; RESOURCE-ALLOCATION;

D O I：

10.1109/TIT.2009.2032821

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The sum-capacity is studied for a K-user physically degraded Gaussian multiple-access relay channel (MARC). Decode-and-forward (DF) is shown to achieve the sum-capacity and capacity region for a subclass of degraded Gaussian MARCs in which the multiple-access link from the sources to the relay is the bottleneck link. For the remaining subclass, DF is shown to achieve the K-user sum-capacity when the sources are symmetric, i.e., they transmit with the same transmit power. The optimality of DF is conjectured for the case of asymmetric sources.

引用

页码：5394 / 5411

页数：18

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