Sum Rate Maximization of an MIMO Two-Way Relay System Using MSE Duality

Author

Ayoung Heo ; Won-Chul Choi ; Jung-Hyun Park ; Dong-Jo Park

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

19

Issue

5

fYear

2015

fDate

May-15

Firstpage

863

Lastpage

866

Abstract

In this letter, we propose a novel joint beamforming scheme using mean-square error (MSE) duality to maximize the sum rate of a multiple-input multiple-output (MIMO) two-way relay system. It is difficult to solve the sum rate maximization problem directly due to its non-convexity. To manage this difficulty, the optimization problem is reformulated as a problem that minimizes the product of the minimum mean-square errors. Then, we show that the per stream MSE duality holds in a two-way relay system under cross power constraints. Based on the per stream MSE duality, an alternate algorithm is proposed to jointly optimize the linear transceivers. The simulation results demonstrate that the proposed scheme outperforms the existing linear schemes in view of the sum rate maximization.

Keywords

MIMO communication; array signal processing; duality (mathematics); least mean squares methods; optimisation; radio transceivers; relay networks (telecommunication); MIMO two-way relay system sum rate maximization; MSE duality; joint beamforming scheme; linear transceiver; minimum mean square error duality; multiple input multiple output two-way relay system sum rate maximization; optimization problem; Array signal processing; Iterative methods; MIMO; Optimization; Relays; Signal to noise ratio; Vectors; MSE duality; Two-way relay; rate optimization;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2015.2414914

Filename

7064730