Adaptive resource allocation has been shown to provide substantial performance gain in OFDMA based wireless systems when perfect channel state information (CSI) is available at the transmitter. However, perfect CSI at the transmitter (CSIT) is rarely possible due to channel estimation errors and channel feedback delay. In this paper, we consider practical resource allocation strategies for downlink multiuser OFDMA systems, where the base station has imperfect CSI. We address the problem of subchannel assignment and power allocation, to maximize the ergodic sum utility under QoS, fairness and total power constraints. This constrained optimization problem is formulated as a non-convex finite dimensional stochastic problem. We use Lagrange dual decomposition framework to derive an algorithm that efficiently finds the optimal allocation. Simulation results show the impact of the channel estimation error on the performance of the system and illustrate the trade-off between maximized utility and the constraints.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    OFDMA Constrained Resource Allocation with imperfect Channel Knowledge


    Contributors:


    Publication date :

    2007-11-01


    Size :

    510398 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Energy-Efficient Resource Allocation in Multi-Cell OFDMA Systems with Imperfect CSI

    Wang, Xiaoming / Zhu, Pengcheng / Zheng, Fu-Chun et al. | IEEE | 2015


    Optimum Resource Allocation in MU-MIMO OFDMA Wireless Systems

    Bontu, Chandra S. / Ghimire, Jagadish / El-Keyi, Amr | IEEE | 2020


    Dynamic Resource Allocation for Full-Duplex OFDMA Wireless Cellular Networks

    Tran, Tam Thanh / Ha, Vu Nguyen / Le, Long Bao et al. | IEEE | 2016


    A Review of Resource Allocation of OFDMA using LDPC Codes

    Selvi, Dr M / Sherya, L K / Srinivasan, E V et al. | IEEE | 2024


    Fair Resource Allocation Algorithm for Chunk Based OFDMA Multi-User Networks

    Shen, Yanyan / Huang, Xiaoxia / Yang, Bo et al. | IEEE | 2017