Coordinated multi-user transmission in distributed antenna-based spectrum-sharing systems

In a spectrum-sharing system (SSS), deploying the antennas in a distributed manner can provide a new spatial dimension for the efficient reuse of licensed frequency bands. In order to improve the sum rate of multiple secondary-users (SUs), this paper addresses the problem of coordinated multi-SU spectrum sharing in a distributed antenna-based SSS. By adopting the Hungarian method and the primal decomposition method, we propose a joint antenna selection and power allocation algorithm, so as to maximize the sum-rate of SUs. Simulation results show that the proposed method can dramatically improve the system performance at a relatively low complexity.