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Pilot Emitting AF Relays and Its Applications to Beamforming  

Joung, Jin-Gon (캘리포니아대학교 적응시스템 연구실)
Lee, Chang-Soo (삼성전자 정보통신총괄)
Lee, Yong-Hoon (카이스트 전자전산학과 디지털통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.12A, 2008 , pp. 1165-1171 More about this Journal
Abstract
In this paper, a pilot emitting amplify-and-forward relay and its beamforming schemes, OBF (overall beamforming) and RBF (hop-by-hop beamforming), are proposed for two-hop relaying systems. The OBF performs beamforming with respect to a overall channel from a source node (SN) to a destination node (DN) through a relay node (RN), while the proposed RBF performs two independent beamformings: from the SN to the RN and from the RN to the DN. From our analytic and numerical results, it is shown that bit-error-rate (BER) performance of the proposed RBF is better than that of the OBF scheme since the RBF system can estimate channel more proper than the CBF system, which is verified by deriving and comparing the mean square errors of the channel estimation.
Keywords
Beamforming; Amplify-and-forward relay; Channel estimation;
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