The Optimal Joint Power Allocation Scheme and Antennas Design in AF MIMO Relay Networks
In this paper, a closed expression of the optimal joint PA is obtained by applying a zero-forcing (ZF) receiver at the destination node to recover the original signal. But the MSE performance of the system would have a great deterioration when applying a ZF receiver at the destination node. The smallest singular value distribution in the theory of matrix analysis is used to explain this MSE deterioration. On this basis, this paper proposes an antennas design at the relay node to eliminate this MSE deterioration. And numerical results show that by applying a ZF receiver at the destination node and the proposed antennas design at the relay node, we not only obtain a closed expression of the optimal joint PA, but also make the MSE performance of the system almost as best as it can be.
KeywordsMIMO relay network optimal joint power allocation zero-forcing receiver antennas design smallest singular value distribution
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