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Partial CSI-Based Cooperative Power Allocation in Multi-Cell Dual-Hop MISO Relay Systems  

Cho, Hee-Nam (서울대학교 전기공학부 송수신기술 연구실)
Kim, Ah-Young (서울대학교 전기공학부 송수신기술 연구실)
Lee, Jin-Woo (서울대학교 전기공학부 송수신기술 연구실)
Lee, Young-Hwan (서울대학교 전기공학부 송수신기술 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.9C, 2009 , pp. 887-895 More about this Journal
Abstract
This paper proposes a cooperative power allocation with the use of partial channel information (e.g., the average signal-to-noise ratio (SNR) and transmit correlation) in multi-cell dual-hop multi-input single-output (MISO) relay systems. In a dual-hop MISO relay channel, it is desirable to allocate the transmit power between dual-hop links to maximize the end-to-end capacity. We consider the maximization of the end-to-end capacity of a dual-hop MISO relay channel under sum-power constraint. The proposed scheme adaptively allocates the transmit power considering the average channel gain of the target relay and the transmit correlation of the desired and inter-relay interference channel from adjacent relays. It is shown by means of upper-bound analysis that the end-to-end capacity can be maximized by making the angle difference of the principal eigenvectors of the desired and inter-relay interference channel orthogonal in highly-correlated channel environments. Finally, the performance of the proposed scheme is verified by computer simulation.
Keywords
Cooperative transmission; MISO relay; partial CSI; power allocation; inter-relay interference;
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