Optimal uplink and downlink channel assignment in a full-duplex multiuser system

Full-duplex (FD) has emerged as a promising solution for increasing the data rate of wireless communication systems. With FD, a wireless terminal can transmit and receive concurrently at the same frequency band. This paper focuses on the resource allocation in a FD multiuser system. With a FD-enabled base-station (BS) and multiple half-duplex (HD) mobile stations (MS), we are interested in jointly optimizing the uplink and downlink channel assignment for each MS and maximizing the system sum-rate. Since the joint optimization problem is a difficult nonconvex problem, we then propose an iterative algorithm to obtain at least a locally optimal solution. In the proposed algorithm, the system sum-rate is maximized via an equivalent problem of minimizing the weighted sum mean-squared error, whereas the channel assignment is updated by a gradient method. Simulation results show that the FD mode has the potential to substantially enhance a multiuser system's data-rate, compared to the HD mode.