说明：  介绍了OFDM 技术的基本原理及其系统实现，以其关键技术之一：信道估计为侧重点介绍了信道估计的算法原理，介绍了一种以两次一维估计（时域和频域）代替时频二维信道联合估计的算法，并给出了该算法的Matlab 仿真实现。
(Describes the basic principles of OFDM technology and system implementation, one of its key technologies: the channel is estimated to focus introduces the principle channel estimation algorithm, introduced a one-dimensional to two estimates (time domain and frequency domain) instead of joint time-frequency two-dimensional channel estimation algorithm, and gives the Matlab simulation of the algorithm implementation.)