A joint source and relay power allocation scheme for a class of MIMO relay systems

  • Authors:

  • Chunguo Li;Xiang Wang;Luxi Yang;Wei-Ping Zhu

  • Affiliations:

  • School of Information Science and Engineering, Southeast University, Nanjing, China;Department of Mathematics, Nanjing University, Nanjing, China;School of Information Science and Engineering, Southeast University, Nanjing, China;Department of Electrical and Computer Engineering, Concordia University, Montreal, QC, Canada

  • Venue:
  • IEEE Transactions on Signal Processing
  • Year:
  • 2009

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Abstract

A joint power allocation (PA) scheme for a class of MIMO relay systems is presented in this paper. Based on the maximization of the capacity or minimization of the mean-square error (MSE), two joint PA optimization problems are first formulated. Since the cost functions thus obtained are in general not convex, a tight lower bound of the capacity and a similar upper bound of the MSE are derived, and employed to modify the two cost functions so as to obtain a convex optimization problem. It is confirmed through computer simulations that the proposed PA scheme out-performs the existing method in terms of both the capacity and the MSE of MIMO relay systems.