三维大规模多进多出系统中导频污染抑制方案

doi:10.19665/j.issn1001-2400.2019.04.002

西安电子科技大学学报 ›› 2019, Vol. 46 ›› Issue (4): 9-15.doi: 10.19665/j.issn1001-2400.2019.04.002

三维大规模多进多出系统中导频污染抑制方案

刘灿,李勇朝(),张锐,李涛

西安电子科技大学综合业务网理论及关键技术国家重点实验室, 陕西西安 710071

收稿日期:2019-03-29 出版日期:2019-08-20 发布日期:2019-08-15
通讯作者: 李勇朝
作者简介:刘灿(1990—),男,西安电子科技大学博士研究生,E-mail: hzjcliucan@163.com.
基金资助:
国家自然科学基金(61771365);陕西省自然科学基金(2017JZ022)

Pilot contamination suppression in 3D massive MIMO systems

LIU Can,LI Yongzhao(),ZHANG Rui,LI Tao

State Key Lab. of Integrated Service Networks, Xidian Univ. , Xi’an 710071, China

Received:2019-03-29 Online:2019-08-20 Published:2019-08-15
Contact: Yongzhao LI

摘要/Abstract

摘要：

为降低三维大规模多进多出系统中的导频污染,提出了一种基于软导频复用的导频污染抑制方案。通过利用垂直方向上的空间自由度,从地理上将用户划分为相邻小区内垂直信道信息可分离的中心用户和不可分离的边缘用户,并对相邻小区的边缘用户分配正交的导频资源,以消除边缘用户的导频污染;对所有小区的中心用户分配相同的导频资源,并通过改进的信道估计方案降低导频污染,从而提升所有用户的信道估计精度。仿真分析表明,相比于传统的导频分配方案,该方案可以在三维大规模多进多出系统下以较低的复杂度更好地抑制导频污染,提升系统的性能。

关键词: 三维大规模多进多出系统, 导频污染, 软导频复用, 信道估计

Abstract:

To tackle the pilot contamination (PC) problem in three-dimensional (3D) massive multiple-input multiple-output (MIMO) systems, a soft pilot reuse (SPR) based pilot contamination suppression scheme is proposed. By exploiting the elevation degree of freedom (DoF), the users with separable or inseparable elevation channel state information (CSI) among the adjacent cells are regarded as center users or edge users, respectively. The edge users in the adjacent cells are assigned orthogonal pilot sequences to eliminate the PC, while the center users in all cells reuse the pilot sequences and suppress the PC by the improved channel estimate method. Thus, the channel estimation accuracy of all the users in the cell can be improved. Simulation results demonstrate that, compared to the conventional pilot allocation schemes, the proposed scheme can decontaminate pilots more effectively and achieve a better system performance with a low complexity.

Key words: three-dimensional massive multiple-input multiple-output, pilot contamination, soft pilot reuse, channel estimate

中图分类号:

TN929.532

刘灿,李勇朝,张锐,李涛. 三维大规模多进多出系统中导频污染抑制方案[J]. 西安电子科技大学学报, 2019, 46(4): 9-15.

LIU Can,LI Yongzhao,ZHANG Rui,LI Tao. Pilot contamination suppression in 3D massive MIMO systems[J]. Journal of Xidian University, 2019, 46(4): 9-15.

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参考文献 16

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参数	数值
基站天线数	水平为8,垂直为4~32
每小区用户数	20
基站相对高度/m	32
小区半径/m	300
用户与基站最小距离/m	30
用户发射功率/dBm	23
噪声谱密度/(dBm·Hz^-1)	-174
路径损耗因子	3
对数正态阴影衰落/dB	8
系统带宽/MHz	10
最大散射半径/m	30

三维大规模多进多出系统中导频污染抑制方案

Pilot contamination suppression in 3D massive MIMO systems

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