一种零中频直接序列扩频数字接收技术

A technology for digital receiver of direct-sequence spread spectrum with zerointermediate frequency

直接序列扩频技术在现代无线通信系统中有着广泛的应用,该信号的数字接收是实现对其侦察截获的关键技术之一。本文介绍了直接序列扩频技术原理及其在cdma2000移动通信系统中的应用,提出一种针对cdma2000直接序列扩频信号的零中频数字接收算法,并详细给出了码捕获及跟踪算法、载波同步算法的数学模型推导。实验结果显示,该算法成功地实现了码同步及载波同步,有较好的解调效果。

Direct-sequence spread spectrum （DSSS） technology is widely applied in modern wireless communication system. In this paper, the principle of direct-sequence spread spectrum technology and the application in cdma2000 system are introduced, and then the digital receiver of DSSS in cdma2000 system with zero-intermediate frequency is proposed, and the mathematical model of DSSS code acquisition, tracking and carrier synchronization algorithm is deduced in detail. The experimental result shows that this algorithm can complete effectively the code and carrier synchronization, and guarantee a good demodulation result.