扩频通信中FFT捕获算法的改进  

Improvement of FFT Acquisition Algorithm in Spread Spectrum Communication System

作　　者：陶峰[1] 王静温 田梦雪 

机构地区：[1]西安卫星测控中心宇航动力学国家重点实验室,陕西西安710043 [2]北京遥测技术研究所,北京100076

出　　处：《无线电工程》2016年第5期41-44,共4页Radio Engineering

摘　　要：针对现有捕获算法中存在累积次数多、捕获时间长和捕获精度不高的问题,对传统的FFT算法进行了部分改进,即利用数据分块、补零和伪码相位的圆周移位增加了相干积分时间进而减少了非相干累积次数,并将二维捕获转化为一维捕获。在相同捕获精度下提高了捕获速度。仿真结果表明,该算法对载噪比低至30 d B的扩频信号仍能满足捕获要求。In order to solve the problems in current acquisition algorithms such as long accumulation length, long acquisition time and low resolution,the classical FFT acquisition algorithm is partly improved.By using the data block,zero-padding and PN code cycleshift,the coherent integration time increases,the non-coherent accumulation times decrease and the two-dimensional acquisition process is converted into one-dimensional acquisition.In the same,the acquisition is accelerated with the same acquisition accuracy.The simulation results show that the proposed algorithm can meet the requirement of acquisition for the spread spectrum signal with carrier to noise ratio down to 30 dB.

关 键 词：扩频通信 扩频捕获 FFT算法 数据分块 

分 类 号：TN911.7[电子电信—通信与信息系统]