电信科学 ›› 2011, Vol. 27 ›› Issue (11): 90-94.doi: 10.3969/j.issn.1000-0801.2011.11.025

• 研究与开发 • 上一篇    下一篇

LTE中一种基于高速铁路场景的信道估计方法

董超,李晓光,刘留,陶成   

  1. 北京交通大学电子信息工程学院 北京 100044
  • 出版日期:2011-11-15 发布日期:2011-11-15
  • 基金资助:
    国家自然科学基金重点资助项目;中央高校基本科研业务费专项资助项目;北京交通大学基本科研业务费资助项目

A Special Channel Estimation Method for the High-Speed Railway Scenario in LTE

Chao Dong,Xiaoguang Li,Liu Liu,Cheng Tao   

  1. School of Electronics and Information Engineering，Beijing Jiaotong University，Beijing 100044，China
  • Online:2011-11-15 Published:2011-11-15

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9

摘要：

LTE 系统在下行采用了OFDM 技术。OFDM 技术将高速数据流调制到相互正交的N 路子载波上，因此易受频偏的影响，尤其在多普勒频偏较大的高速环境下会受到严重的干扰。本文依托LTE 系统，提出一种针对高速铁路场景的信道估计方法，在基于最小二乘（least squares，LS）估计的基础上，针对高速移动环境提出相应的处理方法，包括基于循环前缀（cyclic prefix，CP）的频偏估计和时域能量集中等处理，仿真分析结果表明，与传统方法相比更适合高速场景，在车速达到500 km/h时仍然保持良好的误码率，具有一定的实用价值。

关键词: LTE, 信道估计, 高速铁路, 多普勒频偏, 降采样

Abstract:

In the downlink transmission，LTE（long term evolution）system adopts OFDM technology，which modulates the highspeed data streams to N way orthogonal carriers. As a result，it is so vulnerable to the impact of frequency offset，especially in the Doppler frequency shift of high-speed environment，there will be a serious interference. In this paper，a special channel estimation process in LTE system is proposed for high-way environment. It is based on LS estimation，employing the methods of the CP-based frequency offset estimation and time domain energy concentration and other treatment to meet the high-speed mobile environment. Simulation results show that this method is more suitable for high-speed scenario compared with traditional methods，and as the speed reached 500 km/h，the error rate is still well-behaved.

Key words: LTE, channel estimation, high-speed railway, Doppler spread, down-sampled

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