中文摘要：

大规模MIMO技术因具有高数据率、频带利用率和能量效率等优点被认为是第5代移动通信系统的核心技术之一.在频分双工（FDD）模式下,由于上、下行信道不具有互易性,因此大规模MIMO系统基站如何获得准确的下行信道信息是一个具有挑战性的问题.本文对这一问题进行了研究,提出一种利用信道稀疏性和线性滤波的有效方法.仿真结果表明,与传统方法相比,本文所提方法可以极大提高系统性能.

英文摘要：

Massive Multiple-Input Multiple-Output（MIMO）technology is considered to be one of the core technologies in the fifth generation mobile communication system due to its high data rate,spectrum efficiency and energy efficiency.In the Frequency Division Duplexing（FDD）mode,since the reciprocity between the uplink and downlink channels is not available,it is now becoming a challenging problem for the base station of massive MIMO system to acquire accurate downlink channel state information.In this paper,an efficient method which utilizes the sparsity of channel and linear filtering is proposed to solve this problem.Simulation result shows that the proposed method can greatly improve the system performance compared with the traditional method.