5th International ICST Conference on Wireless Internet

Research Article

Energy-efficient resource allocation in cooperative OFDMA systems

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  • @INPROCEEDINGS{10.4108/ICST.WICON2010.8511,
        author={Fatma Irem S\o{}kmen and Tolga Girici},
        title={Energy-efficient resource allocation in cooperative OFDMA systems},
        proceedings={5th International ICST Conference on Wireless Internet},
        keywords={Energy efficiency Fading Frame relay OFDM Power engineering and energy Power generation economics Power system relaying Resource management Signal to noise ratio Throughput},
  • Fatma Irem Sökmen
    Tolga Girici
    Year: 2010
    Energy-efficient resource allocation in cooperative OFDMA systems
    DOI: 10.4108/ICST.WICON2010.8511
Fatma Irem Sökmen1,*, Tolga Girici1,*
  • 1: Department of Electrical and Electronics Engineering, TOBB University of Economics and Technology, Ankara, Turkey
*Contact email: fsokmen@etu.edu.tr, tgirici@etu.edu.tr


In this work we study framed transmission in an OFDMA based relayed wireless access system that utilize cooperative diversity. We consider a system of a source, a relay and a number of destination nodes, where the nodes can combine the signals coming from the source and relay. We are interested in the case that the source and relay only have the information of path loss and slow fading. The goal in resource allocation is to allocate resources (time slots, subchannels and power) in an energy efficient manner given target rates and target outage probability. Numerical results show that cooperative relaying requires significantly less energy than noncooperative relaying. Adjusting the source and relay transmission durations has a marginal effect on the performance, although it results in a significant increase in complexity.