Capacity of the Gaussian Two-Way Relay Channel to Within 1/2 Bit

被引：249

作者：

Nam, Wooseok ^{[1
]}

Chung, Sae-Young ^{[1
]}

Lee, Yong H. ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Elect Engn, Taejon 305701, South Korea

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 2010年 / 56卷 / 11期

关键词：

Two-way relay channel; wireless networks; network coding; lattice codes; REGION;

D O I：

10.1109/TIT.2010.2069150

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, a Gaussian two-way relay channel, where two source nodes exchange messages with each other through a relay, is considered. We assume that all nodes operate in full-duplex mode and there is no direct channel between the source nodes. We propose an achievable scheme composed of nested lattice codes for the uplink and structured binning for the downlink. Unlike conventional nested lattice codes, our codes utilize two different shaping lattices for source nodes based on a three-stage lattice partition chain, which is a key ingredient for producing the best gap-to-capacity results to date. Specifically, for all channel parameters, the achievable rate region of our scheme is within 1/2 bit from the capacity region for each user and its sum rate is within log 3/2 bit from the sum capacity.

引用

页码：5488 / 5494

页数：7

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