标题: | 正交转换用于OFDM传输系统之研究 Study of orthogonal transfrom for OFDM transmission system |
作者: | 俞君儿 Yu, Chun-Erh 魏哲和 Che-Ho Wei 电子研究所 |
关键字: | 正交转换;正交分频多工;orthogonal transfrom;OFDM;Hartley transform;cosine-modulated filter bank;wavelet transform |
公开日期: | 1996 |
摘要: | 正交分频多工(OFDM)系统的研究和发展已有30年以上的历史,其利用DFT 完成多重载波调变(MCM)亦已被提出。在此论文中,我们讨论以多种正交 转换为基底的OFDM传输系统。对OFDM系统以DFT、DHT、WPT以及CMFB为基 底的架构在某些数位通讯通道中做一比较。由这些比较中,以DFT为基底 的OFDM系统具有等化器容易实现及对频率漂移有较好的免疫力的特性。在 这些正交转换中,DFT是实现OFDM系统的最佳选择。 The research and development of orthogonal frequency division multiplexing (OFDM) system has already been more than 30 years. Also, using discrete Fourier transform (DFT) to implement multicarrier modulation (MCM) has been proposed.In this thesis, OFDM systems based on several orthogonal transforms are studied. DFT-, discrete Hartley transform (DHT)-, wavelet packet transform (WPT)-, and cosine-modulated filter bank (CMFB)-based OFDM systems are compared in some digital communication channels. From these comparisons, DFT-based OFDM system has the advantages in easy implementation of equalizers and better immunity of frequency offset effect. It is the best choice among these orthogonal transforms for implementation of an OFDM system. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT850428065 http://hdl.handle.net/11536/61934 |
显示于类别: | Thesis |