美赛MCM LaTex模板，简单易用，省去大量格式时间，同时格式还更好看-US-race MCM LaTex templates, easy to use, eliminating the need for a large number of formats time, while the format also look better

FDM技术由MCM（Multi-Carrier Modulation，多载波调制）发展而来。OFDM技术是多载波传输方案的实现方式之一，它的调制和解调是分别基于IFFT和FFT来实现的，是实现复杂度最低、应用最广的一种多载波传输方案。(This paper deals with the technologies of channel estimation and equalization for OFDM system.)