Resource allocation for multiuser two-way full-duplex relay networks

An optimal resource allocation scheme for orthogonal frequency division multiplexing (OFDM) based multiuser two-way full duplex (FD) relaying is discussed in this paper. Compared with traditional half duplex (HD) relaying, FD mode can double data rate under perfect interference cancellation, which, however can not be achieved under realistic conditions. Our goal is to maximize the throughput of the whole system by allocating available power and subcarriers under residual self-interference. We formulate a nonlinear optimization problem under individual power constraints. An optimal solution is obtained by using Lagrange dual decomposition method. In addition, a suboptimal solution which reduces the computational complexity significantly is also provided in this paper. Numerical results indicate advantage of the optimal resource allocation scheme proposed in this paper.