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Cooperative strategies and capacity theorems for relay networks (2005)
| Venue: | IEEE TRANS. INFORM. THEORY |
| Citations: | 722 - 19 self |
BibTeX
@ARTICLE{Kramer05cooperativestrategies,
author = {Gerhard Kramer and Michael Gastpar and Piyush Gupta},
title = {Cooperative strategies and capacity theorems for relay networks},
journal = {IEEE TRANS. INFORM. THEORY},
year = {2005},
volume = {51},
number = {9},
pages = {3037--3063}
}
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Abstract
Coding strategies that exploit node cooperation are developed for relay networks. Two basic schemes are studied: the relays decode-and-forward the source message to the destination, or they compress-and-forward their channel outputs to the destination. The decode-and-forward scheme is a variant of multihopping, but in addition to having the relays successively decode the message, the transmitters cooperate and each receiver uses several or all of its past channel output blocks to decode. For the compress-and-forward scheme, the relays take advantage of the statistical dependence between their channel outputs and the destination’s channel output. The strategies are applied to wireless channels, and it is shown that decode-and-forward achieves the ergodic capacity with phase fading if phase information is available only locally, and if the relays are near the source node. The ergodic capacity coincides with the rate of a distributed antenna array with full cooperation even though the transmitting antennas are not colocated. The capacity results generalize broadly, including to multiantenna transmission with Rayleigh fading, single-bounce fading, certain quasi-static fading problems, cases where partial channel knowl-edge is available at the transmitters, and cases where local user co-operation is permitted. The results further extend to multisource and multidestination networks such as multiaccess and broadcast relay channels.
Keyphrases
relay network capacity theorem cooperative strategy ergodic capacity coin-cides local user co-operation past channel output block destination channel output phase information basic scheme transmitting antenna source message statistical dependence capacity result source node broadcast relay channel partial channel knowl-edge relay channel rayleigh fading decode-and-forward scheme channel output abstract coding strategy index term antenna array full coop-eration compress-and-forward scheme certain quasi-static fading problem single-bounce fading ergodic capacity distributed antenna array
