基于离散傅立叶变换的重叠频分复用通信系统  

A novel DFT based overlapped frequency division multiplexing (OvFDM) system

作　　者：王键[1] 杨讯[1] 张曦林[1] 李道本[1] 

机构地区：[1]北京邮电大学信息处理与智能技术重点实验室,北京100876

出　　处：《电波科学学报》2008年第1期17-22,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金项目(90604035)

摘　　要：提出了新的基于离散傅立叶变换(DFT)的重叠频分复用(Overlapped Frequency Division Multiplexing-OvFDM)或非正交频分复用(Non-orthogonal Frequency Division Multiplexing-NOFDM)系统。该系统利用相互重叠的子载波对所发送的数据符号序列进行调制,形成复调制信号,接收端采用最大似然序列检测。该系统的频谱效率与重叠重数成正比,可以大幅度的提高频谱效率;并且该系统子载波带宽大于信道相关带宽,系统在随机时变信道中会自动产生隐分集增益,因此具有较强的抗衰落能力。A novel Overlapped Frequency Division Multiplexing （OvFDM）/Non-orthogonal Frequency Division Multiplexing （NOFDM） system based on DFT is proposed. The OvFDM/NOFDM system can arbitrarily overlap the spectra of its subcarriers of the transmitting signal, so a fast transmission rate can be achieved and a remarkable improvement in spectral efficiency can be obtained. The OvFDM/ NOFDM symbols are detected by the maximum likelihood sequence detection at the receiver. In frequency-selective channels, the sub-carrier＇s bandwidth can be larger than the frequency coherent bandwidth; which can be utilized as implicit frequency diversity to improve the system performance.

关 键 词：重叠频分复用 非正交频分复用 离散傅立叶变换 最大似然序列检测 

分 类 号：TN929.5[电子电信—通信与信息系统]