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OFDM(Orthogonal Frequency Division Multiplexing)是未来4G中的关键技术之一。0FDM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有良好的抗码问干扰能力,能够适应未来无线通信无失真高速传播的要求。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。
OFDM (Orthogonal Frequency Division Multiplexing) is one of the key technologies in the future 4G. Orthogonal frequency division multiplexing (OFDM) subcarriers exist, making great use of spectrum resources and to a certain extent, solving the problem of future spectrum resource shortage. OFDM has good anti-jamming capability and can adapt to high-speed non-distorting wireless communications in the future Request. This paper analyzes the basic principles and performance of OFDM and FFT / IFFT implementation; and finally introduces three multi-carrier CDMA methods based on OFDM.