Research Article
Joint Subcarrier-Relay Assignment and Power Allocation for Decode-and-Forward Multi-Relay OFDM Systems
@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
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.
