NDLI: Optimum Linear Design of Two-Hop MIMO Relay Networks With QoS Requirements

Content Provider	IEEE Xplore Digital Library
Author	Youhua Fu Luxi Yang Wei-Ping Zhu Chen Liu
Copyright Year	1991
Abstract	This paper investigates the optimal design issue of general two-hop amplify-and-forward (AF) MIMO relay networks with one source, one destination and multiple relays, each having multiple antennas. Beginning with the study of the mean-square error (MSE) matrix of the system and the use of Wiener filter for the destination processing, a constrained optimization problem with respect to the unknown relay precoder matrix is formulated with a goal of minimizing the total relay transmit power subject to the MSE-based quality of service (QoS) requirement on each data stream. As the original optimization problem is very difficult to solve, a lower bound of the cost function is pursued to achieve an approximate optimization problem. The modified problem is then solved under the perfect channel state information (CSI) condition using the diagonalization method along with the majorization theory to obtain optimal relay precoder with either nonoptimal or optimal source precoding. It is shown that a convex relay precoding solution is available in the case of nonoptimal source precoding whereas a joint optimal source and relay precoder can be obtained through a multilevel waterfilling algorithm. The optimal design of the relay network under imperfect CSI condition is also considered by modifying the optimization problem with the channel mean and covariance matrix, leading to a robust optimization design of the relay precoder. The proposed technique is validated by Monto Carlo simulations and is also compared with one existing method.
Sponsorship	IEEE Signal Processing Society
Starting Page	2257
Ending Page	2269
Page Count	13
File Size	961866
File Format	PDF
ISSN	1053587X
Volume Number	59
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays MIMO Optimization Quality of service Joints Antennas Signal to noise ratio quality of service (QoS) Amplify-and-forward (AF) joint optimization MIMO relay networks
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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