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: Regenerative Relaying: Relay Selection and Asymptotic Capacity | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 21093 12 pages doi 2007 21093 Research Article Distributed Antenna Channels with Regenerative Relaying Relay Selection and Asymptotic Capacity Aitor del Coso and Christian Ibars Centre Tecnol Ogic de Telecomunicacions de Catalunya CTTC Av. Canal Olimpic Castelldefels Spain Received 15 November 2006 Accepted 3 September 2007 Recommended by Monica Navarro Multiple-input-multiple-output MIMO techniques have been widely proposed as a means to improve capacity and reliability of wireless channels and have become the most promising technology for next generation networks. However their practical deployment in current wireless devices is severely affected by antenna correlation which reduces their impact on performance. One approach to solve this limitation is relaying diversity. In relay channels a set of N wireless nodes aids a source-destination communication by relaying the source data thus creating a distributed antenna array with uncorrelated path gains. In this paper we study this multiple relay channel MRC following a decode-and-forward D F strategy . regenerative forwarding and derive its achievable rate under AWGN. A half-duplex constraint on relays is assumed as well as distributed channel knowledge at both transmitter and receiver sides of the communication. For this channel we obtain the optimum relay selection algorithm and the optimum power allocation within the network so that the transmission rate is maximized. Likewise we bound the ergodic performance ofthe achievable rate and derive its asymptotic behavior in the number of relays. Results showthat the achievable rate of regenerative MRC grows as the logarithm of the Lambert W function of the total number of relays that is C log2 W0 N . Therefore D F relaying cannot achieve the capacity of actual MISO channels. Copyright 2007 A. del Coso and C. Ibars. This is an open access article .
