基于位置分配的去蜂窝massive MIMO系统导频分配功率控制算法
Pilot assignment with power control based on location for cell-free massive MIMO system
申东 1刘家乐 1陈丽1
作者信息
- 1. 兰州交通大学电子与信息工程学院,甘肃兰州 730070
- 折叠
摘要
针对去蜂窝(cell free,CF)大规模多输入多输出(multiple-input multiple-output,MIMO)系统中存在严重的导频污染问题,提出了一种基于位置分配的贪婪导频分配功率控制算法(greedy pilot assignment based on location with pilot power control,GPABL with PPC).首先,遵循相邻用户不分配相同导频序列的原则进行贪婪导频分配(greedy pilot assignment,GPA);然后,在导频分配的基础上叠加了导频功率控制,选择合理的导频功率控制系数减小信道估计的均方误差.仿真结果表明,将两种方式结合起来进行导频优化,系统的吞吐能力有所提升.
Abstract
A greedy pilot assignment based on location with pilot power control algorithm(GPABL with PPC)is proposed for the serious pilot contamination problem in the uplink training phase in cell-free(CF)massive multiple-input multiple-output(MIMO)systems.Based on the principle that neighboring users are not assigned the same pilot sequence,the greedy pilot assignment(GPA)is performed.Then,the pilot power control is superimposed on the base of pilot assignment,and a reasonable pilot power control coefficient is chosen to reduce the mean square error of channel estimation.Simulation results show that the joint use of the two pilot optimization strategies can significantly improve the throughput of the system.
关键词
去蜂窝大规模MIMO系统/导频污染/导频分配/功率控制Key words
cell-free massive MIMO system/pilot contamination/pilot assignment/power control引用本文复制引用
基金项目
国家自然科学基金(61741113)
甘肃省自然科学基金(21JR11RA062)
出版年
2024
NETL
NSTL
万方数据