Joint resource allocation for lifetime-aware cooperative multi-carrier DF system

Authors:
Chao-Ping Guo;Kun Han;Xiao-Long Zhang;Hai-Lin Zhang
Affiliations:
State Key Laboratory of Integrated Services Network, Xidian University, Xi'an, China 710071 and Xi'an Communication Institute, Xi'an, China 710106;State Key Laboratory of Integrated Services Network, Xidian University, Xi'an, China 710071 and Xi'an Communication Institute, Xi'an, China 710106;State Key Laboratory of Integrated Services Network, Xidian University, Xi'an, China 710071;State Key Laboratory of Integrated Services Network, Xidian University, Xi'an, China 710071
Venue:
International Journal of Automation and Computing
Year:
2014

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Abstract

In this paper, we study the problem of optimal resource allocation for lifetime maximization in an orthogonal-frequency-division multiplexing (OFDM) system with decode-and-forward relay. The goal is to minimize total energy cost of the system by jointly optimizing power allocation, subcarrier pairing and relay selection. We present a heuristic solution that is composed of two parts. The first part is an optimal power allocation approach to allocate power to a subcarrier pair of the source and the relay. The second part is a modified Hungarian algorithm to make subcarrier pairing and relay selection. Evaluations show that the presented scheme outperforms other schemes in the total transmitted data and the network lifetime.