大规模MIMO蜂窝网络中导频功率控制的改进方法

导频污染是影响大规模MIMO系统性能提升的因素之一.蜂窝网络中导频功率控制方法适用于导频长度较长的情形,但是导频长度过长不仅影响信道信息的估计,而且影响信息传输速率.为了扩大导频功率控制方法的适用范围,提出一种基于小区分类的导频功率控制的改进方法.将小区分为3类,所有小区均采用同1套导频,利用1维网络中的导频功率控制方法对蜂窝网络中的导频功率进行控制.仿真结果表明,基于小区分类的导频功率控制改进方法适用于导频长度较短的情形,可使蜂窝网络中导频长度的适用范围变大,同时降低了用户的上行功率开销.

An improved pilot power control method in massive MIMO cellular network

Pilot pollution is one of the important issues that affect the performance of large-scale MIMO systems promotion.Pilot power control method is suitable for longer length pilot situation,but the long pilot can affect the channel estimation information and transmission rate.In a cellular network,in order to increase the pilot power control method scope,we proposed an improved pilot power control method based on cell classification in this paper.The cells were divided into three categories,all cells used the same set of pilot,then used one-dimensional network pilot power control method to a cellular network pilot power.Simulation results showed that,in the cellular network,the improved pilot power control method based on cell classification could be applied to the situation that the pilot length was shorter than the original pilot length,so it could enlarge the pilot length scope in cellular networks,and it also could reduce the user's uplink power overhead.