2nd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

Centralised Approaches to Subcarrier Allocation for OFDM-based 802.16 Systems Operating in License-exempt Mode

  • @INPROCEEDINGS{10.1109/CROWNCOM.2007.4549818,
        author={Omar Ashagi and Sean Murphy and Liam Murphy},
        title={Centralised Approaches to Subcarrier Allocation for OFDM-based 802.16 Systems Operating in License-exempt Mode},
        proceedings={2nd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2008},
        month={6},
        keywords={Computer science  Educational institutions  FCC  Informatics  OFDM  Radiofrequency interference  Regulators  Resource management  TV interference  Throughput},
        doi={10.1109/CROWNCOM.2007.4549818}
    }
    
  • Omar Ashagi
    Sean Murphy
    Liam Murphy
    Year: 2008
    Centralised Approaches to Subcarrier Allocation for OFDM-based 802.16 Systems Operating in License-exempt Mode
    CROWNCOM
    IEEE
    DOI: 10.1109/CROWNCOM.2007.4549818
Omar Ashagi1,*, Sean Murphy1,*, Liam Murphy1,*
  • 1: School of Computer Science and Informatics University College Dublin Belfield Dublin, Ireland
*Contact email: omar.ashagi@ucd.ie, sean.murphy@iname.com, liam.murphy@ucd.ie

Abstract

In this paper, three approaches to allocating resources between interfering IEEE 802.16 systems operating in license exempt mode are described. The schemes differ in terms of how they implement the fairness/utilisation trade-off. The three schemes are Throughput Maximisation (ThM), Maximum Fairness (MaF), and a Neighbour Based Resource Allocation (NBRA) approach which produces an approximately fair allocation, but makes more efficient use of any unallocated resources. The three schemes are compared in terms of their overall throughput and the fairness they can deliver. They are also compared with results obtained by a distributed algorithm we proposed in previous work. It is shown that the NBRA approach gives the best throughput/fairness trade-off. Also, the results show that the distributed approach significantly underperforms the full-knowledge resource allocation schemes described here.