大规模MIMO系统中的导频分配方法研究

Pilot allocation in massive MIMO system with the constraint of quality of service (QoS) is inverstigated. Combining the advantage of fairness criteria and maximum sum-rate criteria, it aims to first maximum the number of users satisfying the QoS requirement and then maximum the sum-rate of all the users in the considered cell. An effective pilot allocation scheme is proposed to solve the above non-convex dual problems. Simulation results show that, the number of users satisfying the QoS requirement using the proposed scheme is larger than that using the smart pilot allocation scheme and that using the random allocation pilot scheme. In particular, the sum-rate of the proposed scheme has improved by 8% and 19%, respectively, compared to the random allocation pilot scheme and the smart pilot allocation scheme, when the number of antennas at base station is 512.