2nd International ICST Conference on Broadband Networks

Research Article

Adaptive BCPM downlink resource allocation strategies for multiuser OFDM in cellular systems

  • @INPROCEEDINGS{10.1109/ICBN.2005.1589642,
        author={Navid Damji and Tho Le-Ngoc},
        title={Adaptive BCPM downlink resource allocation strategies for multiuser OFDM in cellular systems},
        proceedings={2nd International ICST Conference on Broadband Networks},
        publisher={IEEE},
        proceedings_a={BROADNETS},
        year={2006},
        month={2},
        keywords={},
        doi={10.1109/ICBN.2005.1589642}
    }
    
  • Navid Damji
    Tho Le-Ngoc
    Year: 2006
    Adaptive BCPM downlink resource allocation strategies for multiuser OFDM in cellular systems
    BROADNETS
    IEEE
    DOI: 10.1109/ICBN.2005.1589642
Navid Damji1,*, Tho Le-Ngoc1,*
  • 1: Department of ECE, McGill University, 3480 University, Montréal, Québec, Canada H3A 2A7
*Contact email: ndamji@po-box.mcgill.ca, tho@ece.mcgill.ca

Abstract

This paper presents an adaptive downlink resource allocation strategy for multi-user orthogonal frequency division multiplexing (OFDM) cellular systems, which minimizes first the transmission bandwidth and then the transmission power. By analysis, it is shown that by keeping the minimum numbers of allocated sub-carriers to satisfy user rate requirements, the probability of interference occurrence in the sub-carriers is reduced and improves the expected link outage probability in the presence of flat fading and shadowing. The proposed bandwidth-constrained power minimization (BCPM) problem is formulated as a linear programming problem and used to derive three-step BCPM schemes. Simulation results in a cellular system to support voice and data services in presence of both frequency selective fading and shadowing show that the proposed BCPM schemes outperform the power minimization (PM) in terms of system outage and packet error rate.