基于离散傅立叶变换扩频的广义多载波系统收发机频域简化实现方法  

A simplified frequency-domain implementation method for the transceiver of discrete Fourier transform spread generalized multi-carrier systems

作　　者：李明齐[1] 芮赟[1] 张小东[1] 周秦英[1] 刘广宇[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《高技术通讯》2009年第1期13-17,共5页Chinese High Technology Letters

基　　金：863计划(2006AA01Z280);上海-法国罗阿大区基金(06SB07107)资助项目

摘　　要：针对基于离散傅立叶变换扩频的广义多载波(DFT-S-GMC)系统的收发机时域实现方法复杂度较高的问题,提出了一种频域等效收发机实现方法;利用滤波器组各子带频率响应能量比原型滤波器的时域冲击响应能量集中的特性,提出了一种基于该频域实现方法的收发机简化实现方法和结构。仿真和分析表明,在多径信道下,采用频域简化实现结构的收发机与现有基于时域实现结构的收发机的误码率(BER)性能几乎相同,但与现有时域实现方法相比,采用频域简化实现方法,DFF-S-GMC系统发射机的实现复杂度可显著降低。A frequency-domain equivalent implementation method was proposed for the transceiver of discrete Fourier transform spread generalized multi-carrier （DFT-S-GMC） systems with the aim of decreasing the implementation complexity. Based on the frequency-domain implementation method, a simplified implementation method for DFT-S-GMC transceivers and the DFT-S-GMC transceiver structure were also presented. The proposed method exploits the property that the energy of frequency response of each sub-band of the filter-bank is more concentrated than that of the time-domain impulse response of the prototype filter. The theoretical analysis and simulation results show that the transceiver with the proposed simplified implementation structure has almost the same bit error rate （BER） performance as that with the existing time-domain implementation structure over multi-path fading channels. Moreover, compared with the existing time-domain implementation methods, the proposed simplified method can reduce the implementation complexity of DFT-S-GMC transmitters significantly.

关 键 词：频分多址(FDMA) 滤波器组 广义多载波(GMC) 离散傅立叶变换(DFT) 

分 类 号：TN859[电子电信—信息与通信工程]