时变信道环境下基于FrFT的单/多载波无线通信系统变换域信号处理方法研究

项目名称： 时变信道环境下基于FrFT的单/多载波无线通信系统变换域信号处理方法研究

项目编号： No.61201251

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 陈恩庆

作者单位： 郑州大学

项目金额： 27万元

中文摘要： SC-FDE系统和OFDM系统分别是单载波和多载波频域均衡技术的代表，其对抗频率选择性衰落的思想和性能基本一致，是下一代宽带无线通信系统的核心技术。但在快速时变信道环境下两系统都面临频域子信道不正交，子信道间产生相互干扰的严重问题。应用FrFT基本理论，本项目构建基于FrFT的正交频分复用（FrFT-OFDM）和单载波分数阶傅里叶域均衡（SC-FrFDE）系统，研究其中FrFD均衡等相关信号处理问题，为实现快速时变信道下宽带无线通信提供新技术和新方法。首先研究FrFT-OFDM和SC-FrFDE系统零前缀加入和去除方法，降低对系统发送端的要求。其次研究系统时变信道估计和递推跟踪算法，精确获取信道信息。第三研究FrFT-OFDM和SC-FrFDE系统最优FrFT阶次选择方法，降低子信道间干扰影响。最后提出SC-FrFDE系统多FrFD数据融合的均衡算法，通过多变换域联合均衡获得更好均衡效果。

中文关键词： 分数阶傅里叶变换；单载波频域均衡；时变信道；最优阶次；

英文摘要： Single carrier frequency domain equalization (SC-FDE) and orthogonal freqyency division multiplexing (OFDM) are the correspondingly representative equalization techniques for single carrier and multicarrier transmission. They have the similar basic idea to combat the frequency-selective fading and both are the core techniques for the next generation of broadband wireless communication systems. However, they both suffer from severe subchannel interference caused by the nonorthogonality of the subchannles in the fast time-varying channel. By using the basic theoris of Fractional Fourier Transfomation (FrFT), this project establishs a system based on FrFT (FrFT-OFDM) and a single carrier fractional fourier domain euqualization system (SC-FrFDE) in order to research the technique of fractinal fourier domain euqualization (FrFDE) and to provide new theories and methods to practice the broadband wireless communication system in the fast time-varying channel. Firstly, we will research the adding and removing methods of zero-padding guardinterval to reduce the demand for transmitter. Secondly, we will research the etimation algorithms of time-varying channel for the proposed systems to abtain the channel state information accurately. Thirdly, we will research the method of selecting the optimal order of FrFT for FrFT-OF

英文关键词： Fractional Fourier Transform；Single Carrier Frequence Domain Equalization；Time-varying channel；Optimal order；