非理想CSIT下超密集分布式天线网络的高能效协同波束成形

[摘要] 针对超密集分布式天线网络（md-DAN）的下行场景，基于以用户为中心的虚拟小区模式，在非理想的发端信道状态信息（CSIT）条件下对系统的高能效协同波束成形问题进行研究。提出一种采用连续Taylor展开和Dinkelbach方法的迭代解决问题方案。仿真表明，该方案在不同网络部署密集程度下均可明显提高md-DAN系统能效。

[关键词] 超密集网络；超密集分布式天线网络；高能效；协同波束成形；非理想CSIT

[Abstract] In this paper, we focus on the downlink of a user-centric virtual cell-based massively dense distributed antenna network (md-DAN), and particularly address the problem of energy efficient coordinated beamforming with non-ideal channel state information at the transmitter (CSIT) condition. By applying the successive Taylor expansion approach and the Dinkelbach method, an iterative scheme is presented to solve the problem. Simulation results illustrate that the presented scheme can markedly improve the md-DAN system energy efficiency under different network deployment densities.

[Keywords] ultra-dense network; massively dense distributed antenna network (md-DAN); energy efficient; coordinated beamforming; non-ideal CSIT