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Optimal joint source and relay beamforming for MIMO relays with direct link

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

In this letter, we investigate the optimal structure of the source precoding matrix and the relay amplifying matrix for non-regenerative multiple-input multiple-output (MIMO) relay communication systems with the direct source-destination link. We show that both the optimal source precoding matrix and the optimal relay amplifying matrix have a beamforming structure. Based on this structure, an iterative joint source and relay beamforming algorithm is developed to minimize the mean-squared error (MSE) of the signal waveform estimation. Numerical example demonstrates an improved performance of the proposed algorithm.

Published in:

Communications Letters, IEEE  (Volume:14 ,  Issue: 5 )