扩频通信系统中基于预处理的编码捕获方法

针对传统的编码捕获方法的不足，文中提出了一种改进的捕获方法。该方法利用扩频序列的循环相移特性，来消除调制信息以及随机数据影响。同时，为了改善接收信号的信噪比，通过采用反馈电路的方法，来抑制噪声干扰。理论分析和仿真实验均表明：文中提出的改进的捕获方法能够明显的改善捕获系统的正确检测概率和虚警概率，提高系统的可靠性。

Code Acquisition Scheme Based on Preprocessing in Spread Spectrum Communication System

In order to avoid the deficiency of the conventional schemes for code acquisition, this paper proposes a improved scheme for code acquisition, which could remove the influence of modulation information and random data by cycle-and-add property. At the same time, in order to improve signal to noise ratio at the receiver, the method of feedback circuit is adopted to suppress noise influence. The theoretical analysis and simulation results show that the proposed scheme could effectively improve detection probability and false alarm probability of code acquisition system, and thus enhance reliability of the system.