Abstract:
This paper derives an optimal source and a close-to-optimal relay precoding structures for minimising the energy consumption of cooperative multiple-input-multiple-output...Show MoreMetadata
Abstract:
This paper derives an optimal source and a close-to-optimal relay precoding structures for minimising the energy consumption of cooperative multiple-input-multiple-output (MIMO) amplify-and-forward (AF) systems, i.e. when relay and direct links are jointly considered. Even though the optimisation problem at hand is generally non-convex, we prove that the energy consumption optimisation function is unimodal when either the source or relay precoding matrix is known. Then, an iterative process is utilised to jointly optimise the source and relay precoding matrices. Simulation results confirm the benefit, in terms of energy consumption, of our novel approach for cooperative MIMO-AF systems in comparison with approaches optimising either the direct or relay link only, with a 20-30% improvement gain in favorable channel conditions.
Date of Conference: 12-15 June 2017
Date Added to IEEE Xplore: 17 July 2017
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