Weighted Sum Rate Maximization for Multiuser Multirelay MIMO Systems

Author

Hyun-Joo Choi ; Kyoung-Jae Lee ; Changick Song ; Hwangjun Song ; Inkyu Lee

Author_Institution

Sch. of Electr. Eng., Korea Univ., Seoul, South Korea

Volume

62

Issue

2

fYear

2013

fDate

Feb. 2013

Firstpage

885

Lastpage

889

Abstract

In this paper, we study a filter design that maximizes the weighted sum rate (WSR) in multiuser multirelay systems equipped with multiple antennas at each node. Since this problem is generally nonconvex, it is quite complicated to analytically find a solution. Hence, we transform the WSR maximization problem to an equivalent weighted sum mean-square-error (WSMSE) minimization problem, which is more amenable. Then, we identify the filters at the base station and the relays for minimizing the WSMSE with a proper weight and propose an alternating computation algorithm that guarantees a local optimum solution. Through simulations, we confirm the effectiveness of our proposed scheme.

Keywords

MIMO communication; antenna arrays; filtering theory; mean square error methods; minimisation; WSMSE minimization problem; WSR maximization problem; base station; computation algorithm; equivalent weighted sum mean-square-error minimization problem; filter design; local optimum solution; multi-input-multi-output systems; multiple antennas; multiuser multirelay MIMO systems; weighted sum rate maximization; Antennas; Complexity theory; Lead; MIMO; Minimization; Relays; Simulation; Amplify-and-forward (AF) relaying; minimum mean-squared-error (MMSE); multi-input multi-output (MIMO); multi-relay; multi-user; relay; weighted sum rate (WSR);

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2012.2226068

Filename

6336836