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Optimal Power Allocation for Spatial Division Multiplexing Scheme at Relays in Multiuser Distributed Beamforming Networks  

Ahn, Dong-Gun (SK텔레콤 Network기술원 Access망개발팀)
Seo, Bang-Won (한국전자통신연구원 이동통신연구본부 차세대이동통신방식연구팀)
Jeong, Cheol (한국과학기술원 전기및전자공학과 통신신호처리 연구실)
Kim, Hyung-Myung (한국과학기술원 전기및전자공학과 통신신호처리 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.4A, 2010 , pp. 360-370 More about this Journal
Abstract
In this paper, a distributed beamforming problem is considered in an amplify-and-forward (AF) wireless relay network consist of multiple source-destination pairs and relaying nodes. To exploit degree of freedom of the number of beamformers, in the first step, we proposed that the sources transmit their signals through orthogonal channels. During the second step, the relays transmit their received signals multiplied by complex weights to amplify and compensate for phase changes introduced by the backward channels through one common channel. The optimal beamforming vectors are obtained through minimization of the total relay transmit power while the signal-to-interference-plus-noise ratios (SINRs) at the destinations are above certain thresholds to meet a quality of services (QoSs) level. In the numerical example, it is shown that the proposed scheme needs less transmit power for moderate network data rates than other schemes, such as space division multiplexing or time-division multiplexing scheme.
Keywords
Distributed Beamforming; Multiuser; Power Allocation; SINR Constraint; AF Relay Network;
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