摘要
在直接序列扩频通信中发射机和接收机之间的相对动态会在载频信号中引起多普勒效应.针对直扩信号接收捕获处理中的多普勒补偿问题,并考虑工程实现中FFT点数的限制,提出一种频域多普勒补偿改进方法,该方法采用预累加处理技术对接收信号和本地信号进行预处理,并通过调整累加参数控制FFT点数及补偿精度.仿真结果表明,与传统的频域多普勒补偿方法相比,该补偿方法可以有效地控制FFT点数并提高多普勒补偿精度从而提高直扩信号接收处理效率.
The relative dynamics between the transmitter and the receiver will cause the doppler effect in direct sequence spread spectrum communication. An improved doppler compensation method is proposed in frequency field, aimming at the doppler compensation of DS signal reception capture and considering the limit of the numbers of FFF in engineering im- plementation, which adopts additive pretreatment technology for the received signal and the local signal, and controls the numbers of FFF and the compensation accuracy. The simulation analysis and the data results show that, comparing with the traditional doppler compensation method in frequency, the improved compensation method can effectively control the numbers of FFF and raise the compensation accuracy to improve the efficiency of DS signal reception.
出处
《沈阳理工大学学报》
CAS
2008年第5期33-36,79,共5页
Journal of Shenyang Ligong University
基金
辽宁省自然科学基金资助项目(60802031)
关键词
无线通信
直接序列扩频
多普勒
接收机
wireless communication
direct sequence spread spectrum
doppler
receiver
