Synchronization and combined channel estimation technology of OFDM in railway frequency selective fading channel

被引：0
|
作者：
Li X. [1 ]
Shi J. [1 ]
Liu H. [1 ]
Tan Z.-H. [1 ]
机构：
[1] State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2010年 / 32卷 / 06期
关键词：
Channel estimation; Orthogonal frequency division multiplexing (OFDM); Railway communications; Synchronization;
D O I：
10.3969/j.issn.1001-8360.2010.06.008
中图分类号：
学科分类号：
摘要：
As the dominant technology in future mobile communication, Orthogonal Frequency Division Multiplexing (OFDM) is studied for its application in the field of railways. Synchronization and combined channel estimation in wireless fading channels are the most significant correlated technology. In this paper, timing synchronization, frequency synchronization and channel estimation are studied, which have intimate relationships in OFDM systems; the OFDM system model in frequency selective fading channels is set up; the frame structure for estimation and the cost function of combined estimation of timing synchronization, carrier synchronization and channel estimation based on the Maximum Likelihood Criterion are designed; and then, a combined estimation algorithm is proposed. Simulation results show as follows: Combined synchronization and channel estimation are able to optimize the integrated capacity of the system; accurate estimation is able to improve the performance of the system, but the improvement is limited through multiple iteration, especially when the SNR is very low. Coarse estimation and accurate estimation for one time are suggested so as to achieve better effect.
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页码：49 / 54
页数：5
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