TDD模式下无小区大规模MIMO系统的导频干扰抑制

doi:10.11959/j.issn.1000-0801.2022071

电信科学 ›› 2022, Vol. 38 ›› Issue (5): 87-94.doi: 10.11959/j.issn.1000-0801.2022071

TDD模式下无小区大规模MIMO系统的导频干扰抑制

王越, 许方敏, 曹海燕

杭州电子科技大学通信工程学院，浙江杭州 310018

修回日期:2022-04-08 出版日期:2022-05-20 发布日期:2022-05-01
作者简介:王越（1993- ），男，杭州电子科技大学通信工程学院硕士生，主要研究方向为无线通信
许方敏（1980- ），女，博士，杭州电子科技大学通信工程学院讲师，主要研究方向为大规模天线系统物理层安全、无限资源分配策略等
曹海燕（1975- ），女，博士，杭州电子科技大学通信工程学院副教授，主要研究方向为无线通信系统的信道编码、信号检测、LTE物理层标准等
基金资助:
浙江省自然科学基金资助项目(LY20F010009);浙江省自然科学基金资助项目(LY22F010012)

Pilot interference mitigation for TDD cell-free massive MIMO systems

Yue WANG, Fangmin XU, Haiyan CAO

School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China

Revised:2022-04-08 Online:2022-05-20 Published:2022-05-01
Supported by:
The Natural Science Foundation of Zhejiang Province(LY20F010009);The Natural Science Foundation of Zhejiang Province(LY22F010012)

摘要/Abstract

摘要：

为了缓解无小区大规模 MIMO 系统的导频干扰、提高系统性能，提出了一种综合导频复用、AP 选择和功率控制的导频干扰抑制策略。首先，提出了基于用户距离排序的导频分配，合理地避免了两个距离较近的用户复用导频，以减少导频干扰的影响。然后，通过分析系统吞吐量表达式中的影响因子确定AP选择的标准，只选择对用户的宏分集增益有主要影响的AP作为用户的服务AP。最后，提出了一种改进的最大最小功率控制算法，提高系统平均吞吐量。仿真结果显示，提出的导频干扰抑制策略有效地减轻了导频干扰带来的性能损失。

关键词: 无小区大规模多输入多输出, 导频复用, 导频污染, 接入点选择, 功率控制

Abstract:

To alleviate the pilot interference for cell-free massive multi-input multi-output (MIMO) system and improve system’s performance, a comprehensive approach including the pilot reuse, access point (AP) selection and power allocation was proposed.Firstly, to alleviate the pilot contamination, the pilot assignment based on the order of user distance was proposed, in which the pilot sharing was only allowed when the distance between two users is large enough to reduce the impact of pilot reuse.Then, by AP selection, only the APs which have main impact on the macro diversity gain were selected as the user’s serving APs.Finally, a modified max-min power control algorithm was proposed to improve the system’s average throughput.Simulation results show that the pilot interference mitigation strategy proposed improves the performance of the system significantly.

Key words: cell-free massive MIMO, pilot reuse, pilot contamination, AP selection, power control

中图分类号:

TN929.5

王越, 许方敏, 曹海燕. TDD模式下无小区大规模MIMO系统的导频干扰抑制[J]. 电信科学, 2022, 38(5): 87-94.

Yue WANG, Fangmin XU, Haiyan CAO. Pilot interference mitigation for TDD cell-free massive MIMO systems[J]. Telecommunications Science, 2022, 38(5): 87-94.

图/表 6

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参数	取值
载波频率	1.9 GHz
带宽	20 MHz
AP天线高度	15 m
用户天线高度	1.65 m
噪声系数	9 dB
ρ_p	100 mW
ρ_u	100 mW
d₁	50 m
d₀	10 m
ζ	0.98
τ	20
T	200
ζ	0.98

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TDD模式下无小区大规模MIMO系统的导频干扰抑制

Pilot interference mitigation for TDD cell-free massive MIMO systems

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