1Feng Lu, Chen. Liu, and H. Zhao, "On the joint optimal power allocation for DF relaying and beamforming communication system," IE- ICE Trans.Commun., vol. E95-B, no. 03, pp. 889-897, March 2012.
2Feng Lu, Renwei Guo, Chen Liu, Shujuan Yu, and Hua-An Zhao, "Relay Selection and Power Allocation in Parallel and Non-parallel OFDM Relay Networks", will appear in IEEE PIMRC, Sep. 2012.