Convex Optimization
Fundamentals of wireless communication
Fundamentals of wireless communication
Network beamforming using relays with perfect channel information
IEEE Transactions on Information Theory
IEEE Transactions on Signal Processing
Precoder design for non-regenerative MIMO relay systems
IEEE Transactions on Wireless Communications
MMSE-based joint source and relay precoding design for amplify-and-forward MIMO relay networks
IEEE Transactions on Wireless Communications
Optimal joint source and relay beamforming for MIMO relays with direct link
IEEE Communications Letters
MMSE based transceiver designs in closed-loop non-regenerative MIMO relaying systems
IEEE Transactions on Wireless Communications
IEEE Transactions on Signal Processing
Linear Transceiver Design in Nonregenerative Relays With Channel State Information
IEEE Transactions on Signal Processing
Capacity scaling laws in MIMO relay networks
IEEE Transactions on Wireless Communications
Optimal Design of Non-Regenerative MIMO Wireless Relays
IEEE Transactions on Wireless Communications
On the capacity of MIMO relay channels
IEEE Transactions on Information Theory
Cooperative Strategies and Capacity Theorems for Relay Networks
IEEE Transactions on Information Theory
Multiple-Antenna Cooperative Wireless Systems: A Diversity–Multiplexing Tradeoff Perspective
IEEE Transactions on Information Theory
Relay-based deployment concepts for wireless and mobile broadband radio
IEEE Communications Magazine
Fading relay channels: performance limits and space-time signal design
IEEE Journal on Selected Areas in Communications
Optimum Linear Design of Two-Hop MIMO Relay Networks With QoS Requirements
IEEE Transactions on Signal Processing
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This paper investigates the precoder design problem in a two-hop amplify-and-forward multiple-input-multiple-output relay system. Many previous works on this problem are based on the minimum mean-square error criterion and the presence of a direct link between the source and the destination is ignored. In this paper, we propose a new method for joint source and relay precoder design based on maximizing the mutual information between the source and the destination, taking both the relay link and the direct link into account. In contrast to previous works, which consider the transmit power constraints of the source and the relay independently, we assume a total power constraint on the sum transmit power of the source and the relay instead to study also the optimal power distribution over the two nodes. A constrained optimization problem with respect to the unknown source precoder matrix and relay precoder matrix is then formulated, which is nonconvex and very difficult to solve directly. We propose a structural constraint on the precoders by analyzing the structure of the problem and referring to related works. With the proposed precoders' structure and by applying the Hadamard's inequality, the original problem is simplified from a matrix-valued problem to a scalar-valued one. However, the new scalar-valued problem is still nonconvex and we manage to convert it into two subproblems and solve it in an iterative fashion. By using the Karash---Kuhn---Tucker (KKT) conditions, we give out the closed-form solutions to the subprobelms. Simulation results demonstrate that the proposed design method converges rapidly and significantly outperforms the existing methods.