A Pilot Contamination Avoidance Based on Pilot Pattern Design for Ultra-Dense Network  

作　　者：Jie Huang Fan Yang Yiwen Gao Zhiming Wang Jun Zhong 

机构地区：[1]School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China [2]China Mobile Group Chongqing Co.Ltd,Chongqing 400044,China [3]Electric Power Research Institute,China Southern Power Grid,Guangzhou 510663,China [4]State Grid Chongqing Electric Power Company,Chongqing 400015,China

出　　处：《China Communications》2020年第12期235-246,共12页中国通信（英文版）

基　　金：This work was supported in part by the Chongqing Research Program of Basic Research and Frontier Technology under Grant cstc2019jcyj-msxmX0233;in part by Science and Technology Research Program of Chongqing Education Commission of China under Grant KJQN201901125,Grant KJQN201901103;in part by the Scientific Research Foundation of Chongqing University of Technology under Grant 2019ZD42,Grant 2019ZD63.

摘　　要：With the ever-growing number of base stations(BSs)and user equipments(UEs)in ultra-dense networks(UDN),reusing the same pilot sequences among the cells is inevitable.With pilot reuse scheme,the channel estimation obtained at a BS contains not only the desired channel-state information(CSI)but also interference from neighboring cells,which can severely degrade CSI estimation performance and adversely affect communication performance.In this paper we consider a pilot contamination avoidance based on pilot pattern design for UDN where the pilot reuse employed and the interfering users from neighboring cells may be not at lower power levels at the BS compared to the in-cell users.We present a novel statistical interference model of sub-carriers to describe the non-deterministic interference from neighboring cells.Then,we provide a pilot pattern design model with non-uniform pilot distribution.Based on this,a pilot contamination avoidance based on pilot pattern design is proposed where pilot reuse scheme and the non-deterministic interference from neighboring cells are taken into consideration.Unlike existing interference mitigation approaches,the proposed method eliminates interference through the method of interference avoidance and can be applied to different kinds of channel estimation algorithms.Simulation results showed that the proposed approach can effectively avoid the interference and ensure the accuracy of channel estimation.

关 键 词：ultra-dense networks(UDN) pilot reuse interference avoidance pilot pattern design 

分 类 号：TN929.5[电子电信—通信与信息系统]