Abstract: The Orthogonal Frequency Division Multiplexing（OFDM） is a multi-carrier 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.

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。