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

Abstract

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

CLC Number:

TN929.5

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.

Figures/Tables 9

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

References 19

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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

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

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