This paper gives an overview on the development of wireless communication and the orthogonal frequency division multiplexing ( ofdm ) technique . basic characters of wireless channel , transmission principles and signal frame structure design of ofdm are introduced . main non synchronization factors between ofdm transceivers are pointed out 本文介绍了无线通信与多载波正交频分复用( ofdm )技术的发展概况,阐述了无线信道的基本特性、 ofdm的调制解调原理与信号帧结构的设计,指出了导致ofdm收发信机间不同步的主要因素。