基于小区间干扰消除的NB-IoT时延估计算法

doi:10.11959/j.issn.1000-436x.2019038

通信学报 ›› 2019, Vol. 40 ›› Issue (2): 92-101.doi: 10.11959/j.issn.1000-436x.2019038

基于小区间干扰消除的NB-IoT时延估计算法

唐宏^1,²,牟泓彦^1,²(),杨浩澜^1,²

¹ 重庆邮电大学通信与信息工程学院，重庆 400065
² 重庆邮电大学移动通信技术重庆市重点实验室，重庆 400065

修回日期:2019-01-17 出版日期:2019-02-01 发布日期:2019-03-04
作者简介:唐宏（1967- ），男，四川南充人，重庆邮电大学教授，主要研究方向为计算机网络、移动通信。|牟泓彦（1994- ），女，重庆人，重庆邮电大学硕士生，主要研究方向为窄带物联网定位、移动通信。|杨浩澜（1977- ），男，重庆人，重庆邮电大学讲师，主要研究方向为移动通信技术。
基金资助:
长江学者和创新团队发展计划基金资助项目(IRT_16R72)

Time delay estimation algorithm of narrow band internet of things based on inter-cell interference cancellation

Hong TANG^1,²,Hongyan MOU^1,²(),Haolan YANG^1,²

¹ School of Telecommunication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
² Chongqing Key Lab of Mobile Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China

Revised:2019-01-17 Online:2019-02-01 Published:2019-03-04
Supported by:
The Program for Changjiang Scholars and Innovative Research Team in University(IRT_16R72)

摘要/Abstract

摘要：

针对窄带物联网（NB-IoT）低功耗、低成本、低采样率等特点，提出了一种基于小区间干扰消除的NB-IoT时延估计算法，所提算法引入了小区间迭代干扰消除算法，以逐步消除各小区信号之间的相互影响。在每一次迭代中，在传统相关算法的基础上引入时频互相关交叠的思想来提升时延估计精度以突破采样率的限制，并采用基于噪声门限的首达径（FAP）搜索算法来抑制多径效应的影响。仿真结果表明所提算法可以在相关算法的基础上明显提高NB-IoT的时延估计精度。

关键词: 窄带物联网, 时延估计, 小区间干扰消除, 首达径搜索

Abstract:

Aiming at the characteristics of NB-IoT such as low power consumption,low cost and low sampling rate,an NB-IoT delay estimation algorithm based on inter-cell interference cancellation was proposed.To gradually eliminate the interaction between signals in each cell,an inter-cell iterative interference cancellation algorithm was considered.In each iteration,the idea of time-frequency cross-correlation overlapping was introduced on the basis of traditional correlation algorithms to break through the limitations of the sampling rate and further improve the accuracy of time delay estimation.At the same time,a first-arrival-path (FAP) searching algorithm based on noise threshold was used to suppress multipath effects.Through experimental simulation,the results show that the proposed algorithm can significantly improve the time delay estimation accuracy of NB-IoT on the basis of related algorithms.

Key words: NB-IoT, time delay estimation, inter-cell interference cancellation, first arrival path searching

中图分类号:

TN929.5

唐宏,牟泓彦,杨浩澜. 基于小区间干扰消除的NB-IoT时延估计算法[J]. 通信学报, 2019, 40(2): 92-101.

Hong TANG,Hongyan MOU,Haolan YANG. Time delay estimation algorithm of narrow band internet of things based on inter-cell interference cancellation[J]. Journal on Communications, 2019, 40(2): 92-101.

图/表 9

图1
总体思路流程及主体时延估计算法架构

图2
不同的α对FAP搜索的影响分析

表1

实验仿真参数"

参数名称	数值
参与定位基站数/个	4
基站间距/m	1 732
信道模型	高斯白噪声信道
基站端、NB-IoT设备终端天线数/根	1
终端节点数量/个	5 000
终端设备移动速度/(km.s^-1)	0
路径损耗	L_d =120.9+37.6 lg d
N_PRS	1
N_i	3
CP类型	常规CP
采样率(F_s )/MHz	1.92
Δt	$\frac{1}{F_{s}}$
$\frac{2 Δ μ}{ω}$	0.01

表1
实验仿真参数

图3
网络部署

图4
服务小区和邻近小区1检测概率随SNR变化的情况

图5
小区 0/1时延估计均方误差变化曲线

图6
定位误差曲线对比

表2
不同累积误差对应的定位误差分析

图7
锚节点定位误差分析

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CDF	传统相关算法/m	EM-SIC算法/m	无IC的所提算法/m	所提算法/m
50%	47.56	18.52	5.52	4.27
80%	69.46	28.73	8.73	6.56
90%	81.18	39.50	10.88	8.00

基于小区间干扰消除的NB-IoT时延估计算法

Time delay estimation algorithm of narrow band internet of things based on inter-cell interference cancellation

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