1 research outputs found
Max-Min Fairness User Scheduling and Power Allocation in Full-Duplex OFDMA Systems
In a full-duplex (FD) multi-user network, the system performance is not only
limited by the self-interference but also by the co-channel interference due to
the simultaneous uplink and downlink transmissions. Joint design of the
uplink/downlink transmission direction of users and the power allocation is
crucial for achieving high system performance in the FD multi-user network. In
this paper, we investigate the joint uplink/downlink transmission direction
assignment (TDA), user paring (UP) and power allocation problem for maximizing
the system max-min fairness (MMF) rate in a FD multi-user orthogonal frequency
division multiple access (OFDMA) system. The problem is formulated with a
two-time-scale structure where the TDA and the UP variables are for optimizing
a long-term MMF rate while the power allocation is for optimizing an
instantaneous MMF rate during each channel coherence interval. We show that the
studied joint MMF rate maximization problem is NP-hard in general. To obtain
high-quality suboptimal solutions, we propose efficient methods based on simple
relaxation and greedy rounding techniques. Simulation results are presented to
show that the proposed algorithms are effective and achieve higher MMF rates
than the existing heuristic methods.Comment: 15 pages, 8 figures, accepted by IEEE Trans. Wireless Commu