大规模MIMO系统中基于匹配算法的分组导频分配方案

Pilot allocation is one of the effective means to reduce pilot pollution in massive Multiple-Input Multiple-Output(MIMO) systems. Combining with the technical advantage of pilot grouping, a low complexity pilot allocation scheme based on matching algorithm is proposed, which aims to improving the uplink achievable sum rates of the strong users at the same time and improve the whole sum rates of the system at last by ensuring the quality of service (QoS) requirements of the week users. According to the large-scale fading coefficients, users in the target cell are divided into the weak users group and the strong users group.In the weak users group,the minimum-maximum matching method of pilot allocation of is adopted. Through the introduction of Hungarian algorithm, a pilot allocation scheme which can guarantee the fairness of the strong users group is designed. The simulation results show that, compared with the smart pilot allocation scheme,the pilot allocation scheme based on Hungarian algorithm and random pilot allocation scheme,the system performance of the proposed scheme has been effectively improved.