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Optimal beamforming for non-regenerative MIMO relays with direct link

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2 Author(s)
Yue Rong ; Dept. of Electr. & Comput. Eng., Curtin Univ. of Technol., Bentley, WA, Australia ; Feifei Gao

In this letter, we generalize the existing works on the design of the optimal relay amplifying matrix for nonregenerative multiple-input multiple-output (MIMO) relay communication systems by including the direct source-destination link. We show that for most commonly used objective functions, the optimal relay amplifying matrix has a general beamforming structure, that is, the relay first sets beams to the direction of the source-relay channel, then conducts a linear precoding, and finally beamforming towards the direction of the relay-destination channel.

Published in:

Communications Letters, IEEE  (Volume:13 ,  Issue: 12 )

Date of Publication:

December 2009

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