Source and Relay Precoder Designs to Maximize Sum Rate in Two-Way Relay System with Multiple Sources

Author

Changdon In ; Jae-Mo Kang ; Hyung-Myung Kim

Author_Institution

Dept. of Electr. Eng., KAIST, Daejeon, South Korea

fYear

2015

fDate

11-14 May 2015

Firstpage

1

Lastpage

5

Abstract

We propose the source and relay precoder designs to maximize sum rate under individual power constraints in two-way relay system with one relay and multiple sources. However, it is difficult to directly solve the sum rate maximization problem. For this reason, we establish the relationship between sum rate and weighted mean square error(WMSE), and show that the solution of the sum rate maximization problem can be also the solution of the WMSE minimization problem if the weight matrices are properly chosen. Then, based on the relationship between sum rate and WMSE, the sum rate maximization problem is equivalently formulated as the WMSE minimization problem. We finally propose an iterative algorithm for WMSE minimization problem. Simulation results show that the proposed scheme has better sum rate performance than conventional scheme at all SNR regimes.

Keywords

iterative methods; mean square error methods; optimisation; precoding; relay networks (telecommunication); WMSE minimization problem; iterative algorithm; relay precoder design; source precoder design; sum rate maximization; two-way relay system; weighted mean square error; Antennas; Cost function; Interference; Minimization; Relays; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2015 IEEE 81st

Conference_Location

Glasgow

Type

conf

DOI

10.1109/VTCSpring.2015.7146094

Filename

7146094