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Joint optimization of relay-precoders and decoders with partial channel side information in cooperative networks

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2 Author(s)
Zhihang Yi ; Dept. of Electr. & Comput. Eng., Queen''s Univ., Kingston, Ont. ; Il-Min Kim

We jointly optimize the relay-precoders and decoders with full or partial channel side information (CSI) in a cooperative network. Specifically, three different CSI assumptions are considered: 1) full CSI at the destination terminal and the relay terminals; 2) full CSI at the destination terminal and partial CSI at the relay terminals; 3) partial CSI at the destination terminal and the relay terminals. We show that, under the assumption of full CSI at the destination terminal and the relay terminals, the optimum relay-precoder is the cooperative transmission beamforming and the optimum decoder is a maximum ratio combiner. Under the two partial CSI assumptions, the optimum relay-precoders and decoders work in a fashion of channel selection. It is demonstrated that the proposed optimum relay-precoders and decoders improve the performance considerably

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Selected Areas in Communications, IEEE Journal on  (Volume:25 ,  Issue: 2 )