高铁场景下一种基于信噪比判决的双模切换信道估计算法

doi:10.11959/j.issn.1000-0801.2018199

Abstract

Abstract:

A dual mode switching channel estimation algorithm based on SNR decision in high speed railway scenarios was proposed.The algorithm adopted DKL-BEM and LMMSE modelling the channel and estimating the channel under different speed conditions,respectively.The simulation results show that the SNR increased,the performance of the twice channel estimation algorithm based on ICI cancellation became worse than that of the traditional DKL-BEM algorithm,and a cross-point appeared,its value moved towards the small SNR as the speed increased.Through analyzing the parameters and extracting the cross-point values of the two algorithms,the moving trajectory of the cross-point with the speed changing was given.The proposed algorithm can adaptively achieve the switching between two algorithms and improve the applicability and effectiveness of the channel estimation algorithm.

Key words: high speed railway scenario, dual mode switching, adaptive, cross-point, time-varying channel

Chuanyun WANG,Min WANG,Junhui ZHAO,Yan YIN. A dual mode switching channel estimation algorithm based on SNR decision in high speed railway scenarios[J]. Telecommunications Science, 2018, 34(7): 72-79.

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参数	设置值
子载波个数N	256
调制方式	QPSK
信道多径数L	6
各径时延/μs	0，1，2，3，4，5
采样时间间隔t_s/μs	1
循环前缀长度	32
BEM阶数Q	4
梳状导频簇数M	8
每簇中的非零导频个数a	1
非零导频两侧保护导频数（单侧）b	4
导频簇之间的间隔载波个数	23

交叉点	A4	A5	A6
实际信噪比值/dB	23.197	18.065	14.883
理论计算值y_snr/dB	22.370	18.260	15.170
相对误差	3.57%	1.08%	1.93%

A dual mode switching channel estimation algorithm based on SNR decision in high speed railway scenarios

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