OFDM系统中基于导频的二维信道估计

2-D CHANNEL ESTIMATION BASED ON PILOT IN OFDM SYSTEMS

正交频分复用(OFDM)是一种多载波调制技术,它能有效地克服多径干扰和码间串扰,是第四代移动通信的核心技术。作者首先简要介绍了OFDM的基本原理,重点研究了二维维纳滤波信道估计算法,考虑到算法复杂度和性能之间的折衷,进一步研究了2×1-D维纳滤波信道估计算法。仿真结果显示:2×1-D维纳滤波算法能够在保持良好性能情况下有效降低算法的复杂度。

Orthogonal Frequency Division Multiplexing （OFDM） is a multi-carrier modulation technique. OFDM has a good performance in dealing with multi-path disturbance and inter symbol interference （ISI） ,it is the key technology of 4G in the field of mobile communication. In this paper, OFDM basic principle was briefly introduced. Then, 2-D Wiener filtering algorithm was emphatically studied. Thirdly, 2 × 1-D Wiener filtering algorithm was studied for the tradeoff between performance and complexity. The simulation results showed that 2 ×1-D Wiener filtering algorithm reduced the complexity remarkably with performance slightly degraded.