认知无线网络的联合波束成形和用户选择

In this paper, we consider a scenario that a primary network and a secondary network share the same frequency spectrum. By using subspace theory, we propose a joint beamforming and secondary user selection algorithm for the downlink of secondary network, which can produce no interference to the primary users and maximize the sum throughput simultaneously. Simulation results agree well with the theorectical analysis and also indicate that little sum rate throughput loss is induced when equal power allocation scheme is deployed.