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This paper considers a channel estimation scheme for a two-hop non-regenerative MIMO relay system. The scheme has two phases. In the first phase, the source node transmits no signal, the relay transmits a training matrix and the destination estimates the relay-to-destination channel matrix. In the second phase, the source transmits a training matrix, the relay amplifies and forwards with a relay transformation...
The paper investigates linear beamforming techniques in relay networks with multiple independent sources, destinations and relay(s). The goal is to determine the beamforming matrix to minimize the sum transmit power at the relays while meeting signal-to-interference (SINR) requirements at the destinations. Two scenarios are considered: one is the case of single relay with multiple antennas in which...
Two new precoding schemes based on the minimum mean-square error (MMSE) criterion for amplify-and-forward MIMO relay networks with quality-of-service (QoS) requirements are proposed. In the optimal joint source and relay precoding (OJSRP) scheme, primal decomposition technique is employed to decompose the non-convex optimization problem into a sub-problem and a master problem, which are convex and...
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