英语翻译正交频分复用（OFDM）是一种特殊的多载波传输方案,它可以被看作是一种调制技术,也可以被看作一种复用技术.选择OFDM的一个主要原因在于该系统能够很好地对抗频率选择衰落或窄

Question

英语翻译
正交频分复用（OFDM）是一种特殊的多载波传输方案,它可以被看作是一种调制技术,也可以被看作一种复用技术.选择OFDM的一个主要原因在于该系统能够很好地对抗频率选择衰落或窄带干扰.它的基本原理是将高速的数据流分解为多路并行的低速数据流,在多个载波上同时进行传输.对于低速并行的子载波而言,由于符号周期展宽,多径效应造成的时延扩展相对变小.当每个OFDM符号中插入一定的保护时间后,码间干扰几乎就可以忽略.我们在MATLAB的GUI图形界面中,设计OFDM传输界面,利用MATLAB语言实现控键功能,可以很直观得观察信号按OFDM系统方式传输的结果.通过串并转换、星座映射、IFFT换算、插入保护时隙、误码率曲线等按键可以更透彻地了解OFDM调制解调整个过程
不要用什么金山快译,一看就知道很多错误了

Answer 1

The Orthogonal Frequency Division Multiplexing (OFDM) is one kind of special multi-carrier transmission plan,it may regard as is one kind of modulating technology,may also regard as one kind of multiplying technology.Chooses OFDM a primary cause to lie in this system to be able to resist the frequency selection to decline well or the selective interference.Its basic principle is decomposes the high speed data stream into the multi-channel parallel low speed data streams,simultaneously carries on the transmission in many carriers.Speaking of the low speed parallel sub-carrier,as a result of the mark cycle stretch,the latency which the multi-diameter effect creates expands changes relatively is small.When in after each OFDM mark inserts certain guard time,the intersymbol interference nearly may neglect.We in the MATLAB GUI graphical interface,design the OFDM transmission contact surface,realizes using the MATLAB language controls the key function,may be very direct-viewing the observation signal according to the OFDM system way transmission result.And transforms,pressed keys and so on constellation mapping,IFFT conversion,insertion protection time slot,error rate curve through the string to be possible to understand the OFDM modulation demodulation entire process thoroughly