OFDM:4G中的OFDM关键技术  

OFDM:Key Technique of OFDM in 4G

作　　者：李利[1] 易丹[1] 谈振辉[1] 金晓军[1] 

机构地区：[1]北京交通大学现代通信研究所,北京100044

出　　处：《辽宁工学院学报》2003年第6期4-6,共3页Journal of Liaoning Institute of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助研究课题(项目批准号:90104016)。

摘　　要：OFDM(OrthogonalFrequencyDivisionMultiplexing)是未来4G中的关键技术之一。OFDM的各个子载波存在正交性,极大的利用了频谱资源,在一定程度上解决了未来频谱资源紧张的问题;OFDM有良好的抗码间干扰能力,能够适应未来无线通信无失真高速传播的要求;OFDM能用FFT/IFFT来实现,灵活多变,因而能够满足无线通信系统中的业务要求。本文分析了OFDM的基本原理和性能及FFT/IFFT实现;最后介绍了以OFDM为基础的三种多载波CDMA方式,并给出了简单比较。OFDM will be the key technique in 4G.OFDM features its every individual subcarrier having orthogonol nature of making use of frequency resources to full extent,which solves the problem on lackness of frequence resources to a certain degree.So OFDM has good performance in resisting interference and is able to meet the need of future wireless high speed transmission without any distortion.OFDM can be realized through FFT/IFFT,and be made flexible,changeable and satisfactory with business requirement in radio communication.The basic principle,performance and FFT/IFFT realization are analyzed.Finally,three kinds of multicarriers~′CDMA modes are introduced on the basis of OFDM,with simple comparisions among the three proposed.

关 键 词：OFDM 4G 子载波 频谱资源 抗码间干扰能力 FFT/IFFT 无线通信 

分 类 号：TN929.5[电子电信—通信与信息系统]