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

Chuanyun WANG; Min WANG; Junhui ZHAO; Yan YIN

doi:10.11959/j.issn.1000-0801.2018199

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

research and development | 更新时间：2024-06-05

- A dual mode switching channel estimation algorithm based on SNR decision in high speed railway scenarios
- Telecommunications Science Vol. 34, Issue 7, Pages: 72-79(2018)
- 作者机构：
  
  1. 华东交通大学，江西南昌 330013
  2. 北京交通大学，北京 100044
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.1000-0801.2018199
  CLC： TN929
- Published Online：2018-07，
  
  Published：20 July 2018
- 稿件说明：
移动端阅览
Chuanyun WANG, Min WANG, Junhui ZHAO, et al. A dual mode switching channel estimation algorithm based on SNR decision in high speed railway scenarios[J]. Telecommunications science, 2018, 34(7): 72-79.
DOI：

Chuanyun WANG, Min WANG, Junhui ZHAO, et al. A dual mode switching channel estimation algorithm based on SNR decision in high speed railway scenarios[J]. Telecommunications science, 2018, 34(7): 72-79. DOI： 10.11959/j.issn.1000-0801.2018199.

摘要

为了提高信道在信噪比大范围变化环境下信道估计的精度，确保高速铁路通信系统的可靠性，提出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。该算法利用离散卡—洛基扩展模型（discrete Karhunen-Loeve basis expansion model，DKL-BEM）及线性最小均方误差（linear minimum mean square error， LMMSE）算法进行信道建模和不同速度环境下的信道估计。仿真发现，当信噪比增大至某值时，基于ICI消除的二次信道估计算法性能劣于传统的DKL-BEM算法（出现交叉点），且交叉点值随速度的提高左移（小信噪比方向）。通过对参数分析和两种算法交叉点值的提取，给出交叉点随速度变化的移动轨迹，自适应地实现两种算法的切换，提高信道估计算法的适应性和有效性。

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.

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references

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