Joint Subcarrier-Relay Assignment and Power Allocation for Decode-and-Forward Multi-Relay OFDM Systems

Hua Mu; Meixia Tao; Wenbing Dang; Yao Xiao

ChinaCom2009-Wireless Communications and Networking Symposium

Research Article

Joint Subcarrier-Relay Assignment and Power Allocation for Decode-and-Forward Multi-Relay OFDM Systems

Cite: BibTeX Plain Text

@INPROCEEDINGS{10.1109/CHINACOM.2009.5339801,
    author={Hua Mu and Meixia Tao and Wenbing Dang and Yao Xiao},
    title={Joint Subcarrier-Relay Assignment and Power Allocation for Decode-and-Forward Multi-Relay OFDM Systems},
    proceedings={ChinaCom2009-Wireless Communications and Networking Symposium},
    publisher={IEEE},
    proceedings_a={CHINACOM2009-WCN},
    year={2009},
    month={11},
    keywords={},
    doi={10.1109/CHINACOM.2009.5339801}
}

Hua Mu
Meixia Tao
Wenbing Dang
Yao Xiao
Year: 2009
Joint Subcarrier-Relay Assignment and Power Allocation for Decode-and-Forward Multi-Relay OFDM Systems
CHINACOM2009-WCN
IEEE
DOI: 10.1109/CHINACOM.2009.5339801

Hua Mu¹^,*, Meixia Tao¹^,*, Wenbing Dang¹^,*, Yao Xiao¹^,*

1: Department of Electronic Engineering Shanghai Jiao Tong University, Shanghai, China

*Contact email: hua.mu@sjtu.org, mxtao@sjtu.edu.cn, dwb87514@sjtu.edu.cn, xiaoyaorhythm@sjtu.edu.cn

Abstract

Joint power allocation, relay selection, and subcarrier assignment are critical and challenging for achieving full benefits of OFDM based cooperative relay networks. In this paper, we study such a problem in a dual-hop multi-relay OFDM system with an objective of maximizing the spectral efficiency under a total power constraint. The system consists of a pair of source and destination and multiple decode-andforward relays. We formulate the joint optimization of the three types of resources: power, subcarrier and relay nodes, as a problem of subcarrier-relay assignment and power allocation. We show that it can be decomposed into 2N + 1 sub-problems through dual relaxation, with N being the total number of subcarriers. An optimal algorithm with polynomial complexity is presented. A suboptimal algorithm that decouples the subcarrierrelay assignment and power allocation is also proposed to tradeoff between performance and computational complexity.

Published: 2009-11-20
Publisher: IEEE
Modified: 2010-05-16

: http://dx.doi.org/10.1109/CHINACOM.2009.5339801