二维内插的OFDM导频信道估计的研究  

Research of 2-D interpolation in OFDM pilot-assisted channel estimation

作　　者：陈奎[1] 徐钊[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《计算机工程与应用》2009年第12期149-152,共4页Computer Engineering and Applications

摘　　要：正交频分复用(OFDM)是一种多载波传输和调制技术,其主要特点是频带利用率高、抗多径干扰能力强,目前已成为无线通信高速数据传输的主要技术。介绍了OFDM系统的工作原理和二维信道估计技术,着重研究基于二维内插方式和二维变换域方式的PSAM信道估计技术,针对导频特点提出变换域插值一种改进的方法并与线性差值、样条差值进行对比。采用Simulink构建系统基带仿真并验证Rayleigh信道下各种二维插值方法的BER性能,结果表明该改进方法可行且具有良好的性能。The Orthogonal Frequency Division Multiplexing （OFDM） is a multi-can＇ier modulation and/or transmission scheme. Higher bandwidth utilization rate and more resistant to channel multi-path disturbance make it become one of high-data-rate wireless communication technologies.This paper investigates the OFDM system channel estimation techniques based on 2-D interpolation firstly.Then the performance of different 2-D interpolation,such as 2-D linear,spline,cubic-spline and 2-D transform domain interpolation are compared.An improved 2-D transform domain interpolation is proposed to improve 2-D transform domain interpolation under different pilot models.A SimulinkTM model is built to simulate the system＇s BER and results show that the proposed method has good performance under Rayleigh channels.

关 键 词：正交频分复用 二维插值 变换域 信道估计 

分 类 号：TN911.3[电子电信—通信与信息系统]