D-MG Tradeoff and Optimal Codes for a Class of AF and DF Cooperative Communication Protocols

Elia, Petros E and Vinodh, K and Anand, M and Kumar, P Vijay (2009) D-MG Tradeoff and Optimal Codes for a Class of AF and DF Cooperative Communication Protocols. In: IEEE International Symposium on Information Theory, JUL 2009, Nice,FRANCE, pp. 3161-3185.

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Abstract

Cooperative relay communication in a fading channel environment under the orthogonal amplify-and-forward (OAF), nonorthogonal and orthogonal selection decode-and-forward (NSDF and OSDF) protocols is considered here. The diversity-multiplexing gain tradeoff (DMT) of the three protocols is determined and DMT-optimal distributed space-time (ST) code constructions are provided. The codes constructed are sphere decodable and in some instances incur minimum possible delay. Included in our results is the perhaps surprising finding that the orthogonal and the nonorthogonal amplify-and-forward (NAF) protocols have identical DMT when the time durations of the broadcast and cooperative phases are optimally chosen to suit the respective protocol. Moreover our code construction for the OAF protocol incurs less delay. Two variants of the NSDF protocol are considered: fixed-NSDF and variable-NSDF protocol. In the variable-NSDF protocol, the fraction of time occupied by the broadcast phase is allowed to vary with multiplexing gain. The variable-NSDF protocol is shown to improve on the DMT of the best previously known static protocol when the number of relays is greater than two. Also included is a DMT optimal code construction for the NAF protocol.

Item Type:	Conference Paper
Publication:	IEEE TRANSACTIONS ON INFORMATION THEORY
Publisher:	IEEE
Additional Information:	Copyright 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Cooperative diversity; cyclic division algebra codes; distributed space-time (ST) code; diversity-multiplexing gain tradeoff (DMT); nonorthogonal amplify-and-forward (NAF); orthogonal amplify-and-forward(OAF); selection decode-and-forward; ST codes
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	17 Jul 2009 06:37
Last Modified:	19 Sep 2010 05:37
URI:	http://eprints.iisc.ac.in/id/eprint/21476

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