摘要
讨论基于软件无线电技术的直接序列扩频码元捕获及跟踪的快速算法。利用伪随机序列尖锐的自相关特性,通过计算中频接收信号与本地匹配滤波器的循环相关完成码元捕获,提出了循环相关的两种快速算法,并分析了正确捕获概率及平均捕获时间,最后给出码元跟踪的简便算法及精度。仿真及实验验证了所述算法的正确性和有效性,特别适用于信噪比较低、对设备体积及功耗限制严格的通信系统中。
Fast algorithms of code acquisition and tracking for DS/SS are presented based on software radio. Code acquisition can be done via calculating the cyclecorrelation between received IF signal and local matched filter, using the autocorrelation's sharp characteristic of PN sequence. Two fast algorithms for cyclecorrelation are presented. Their correct acquisition probabilities and average acquisition times are analyzed. Finally a simple algorithm of code tracking and its precision are presented. The correctness and validity of these algorithms have been tested by simulation and experiment, and they can be used especially when the SNR is very low and the size and power of the instruments are strictly limited.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2003年第5期76-79,97,共5页
Journal of National University of Defense Technology
