【摘要】 主要介绍 OFDM基本原理及其在移动通信中的应用。其中 ,OFDM基本原理部分首先介绍了OFDM的 IFFT/ FFT实现 ,然后用矩阵的方法分析了循环前缀对时间弥散信道所带来的 ISI和 ICI的消除。最后 ,作为 OFDM在移动通信中的主要应用 ,介绍了 OFDM与 DS- CDMA技术相结合所产生的 3种多载波 CDMA方式 ,并给出了它们的简单比较更多还原

【Abstract】 In this article, the principle of OFDM and its apllications in mobile communications are introduced. After the overview of OFDM, the principle of the realization of OFDM by IFFT/FFT is examined; then, the matrix method is used to analyze ISI (Inter-Symbol Interference) and ICI (Inter-Carrier Interference) cancellation brought by using Cyclic Prefix in a time dispersive channel. In the end, as OFDM is mainly applied in mobile communications, three types of combination between OFDM and DS-CDMA(their general designation is "Multi-carrier CDMA") are introduced and a simple comparison is given.更多还原