Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Power-Efficient Relay Selection in Cooperative Networks Using Decentralized Distributed Space-Time Block Coding | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 362809 10 pages doi 2008 362809 Research Article Power-Efficient Relay Selection in Cooperative Networks Using Decentralized Distributed Space-Time Block Coding Lu Zhang and Leonard J. Cimini Jr. Department of Electrical and Computer Engineering University of Delaware Newark DE 19716 USA Correspondence should be addressed to Lu Zhang luzhang@ Received 1 May 2007 Accepted 8 September 2007 Recommended by R. K. Mallik Distributed space-time block coding Dis-STBC achieves diversity through cooperative transmission among geographically dispersed nodes. In this paper we present a power-efficient relay-selection strategy for decentralized Dis-STBC in a selective decode-and-forward cooperative network. In particular for a two-stage network each decoded node broadcasts a small amount of information with limited power. This node then utilizes its own and its neighbors information to decide whether or not to act as a relay for the source information. In this way only part of the decoded set will act as relays. Further by applying the idea of this relay-selection strategy to each relaying hop in a multihop network a power-efficient hop-by-hop routing strategy is formulated. The outage analyses and simulations are presented to illustrate the advantage of these strategies. Copyright 2008 L. Zhang and L. J. Cimini Jr. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Cooperative diversity is a set of techniques that exploits the spatial diversity available among a collection of distributed single-antenna terminals . see 1 . In most proposed cooperative systems a two-stage relaying strategy is used. In the first stage a source transmits and all the other nodes listen in the second stage
