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Fading relay channels: Performance limits and space-time signal design (2004)
| Venue: | IEEE J. SELECT. AREAS COMMUN |
| Citations: | 445 - 4 self |
BibTeX
@ARTICLE{Nabar04fadingrelay,
author = {Rohit U. Nabar and Helmut Bölcskei and Felix W. Kneubühler},
title = {Fading relay channels: Performance limits and space-time signal design},
journal = {IEEE J. SELECT. AREAS COMMUN},
year = {2004},
volume = {22},
pages = {1099--1109}
}
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Abstract
Cooperative diversity is a transmission technique where multiple terminals pool their resources to form a virtual antenna array that realizes spatial diversity gain in a distributed fashion. In this paper, we examine the basic building block of cooperative diversity systems, a simple fading relay channel where the source, destination and relay terminals are each equipped with single antenna transceivers. We consider three different TDMA-based cooperative protocols that vary the degree of broadcasting and receive collision. The relay terminal operates in either the amplify-and-forward (AF) or decode-and-forward (DF) modes. For each protocol, we study the ergodic and outage capacity behavior (assuming Gaussian code books) under the AF and DF modes of relaying. We analyze the spatial diversity performance of the various protocols and find that full spatial diversity (second-order in this case) is achieved by certain protocols provided that appropriate power control is employed. Our analysis unifies previous results reported in the literature and establishes the superiority (both from a capacity as well as a diversity point-of-view) of a new protocol proposed in this paper. The second part of the paper is devoted to (distributed) space-time code design for fading relay channels operating in the AF mode. We show that the corresponding code design criteria consist of the traditional rank and determinant criteria for the case of co-located antennas as well as appropriate power control rules. Consequently space-time codes designed for the case of co-located multi-antenna channels can be used to realize cooperative diversity provided that appropriate power control is employed.
Keyphrases
relay channel performance limit space-time signal design cooperative diversity appropriate power control second part simple fading relay channel spatial diversity gain gaussian code book certain protocol diversity point-of-view multiple terminal virtual antenna array outage capacity behavior single antenna transceivers full spatial diversity various protocol determinant criterion corresponding code design criterion consist appropriate power control rule basic building block co-located multi-antenna channel space-time code analysis unifies previous result spatial diversity performance relay terminal distributed fashion transmission technique different tdma-based cooperative protocol receive collision traditional rank cooperative diversity system df mode co-located antenna new protocol af mode space-time code design
