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


Vol. 35,  No. 4, pp. 360-370, Apr.  2010


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  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.

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  Cite this article

[IEEE Style]

D. Ahn, B. Seo, C. Jeong, H. Kim, "Optimal Power Allocation for Spatial Division Multiplexing Scheme at Relays in Multiuser Distributed Beamforming Networks," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 4, pp. 360-370, 2010. DOI: .

[ACM Style]

Donggun Ahn, Bang-Won Seo, Cheol Jeong, and Hyung-Myung Kim. 2010. Optimal Power Allocation for Spatial Division Multiplexing Scheme at Relays in Multiuser Distributed Beamforming Networks. The Journal of Korean Institute of Communications and Information Sciences, 35, 4, (2010), 360-370. DOI: .

[KICS Style]

Donggun Ahn, Bang-Won Seo, Cheol Jeong, Hyung-Myung Kim, "Optimal Power Allocation for Spatial Division Multiplexing Scheme at Relays in Multiuser Distributed Beamforming Networks," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 4, pp. 360-370, 4. 2010.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880