一种突发直扩接收机的快速载波同步方案

在突发直接序列扩频接收机中,当捕获信号后,需要在较短的导频符号长度内快速实现载波同步,结合所涉及的项目,为了达到这一目的,采用了一种FFT校频＋锁频环＋数字Costas环的快速载波同步方法;并在项目指标所要求的信噪比下,在Matlab上做了算法仿真实验;仿真结果表明该方法可以在规定导频序列长度内快速实现载波同步,实现用户数据的正确解调;该方法具有可纠正频偏范围大,实现同步速度快,方法结构简单,能在低信噪比环境下稳定工作的特点。

Fast carrier synchronization scheme for burst-mode DSSS receiver

In the Burst-mode DSSS receiver,we need to achieve carrier synchronization in short preambles after the DSSS signal is captured.,to achieve this objective which combines with our project;we use a fast carrier synchronization scheme of FFT+FLL+Digital Costas loop;and we simulate the scheme on the Matlab under the required SNR of our project indicators;the result of the simulation indicates the scheme can achieve carrier synchronization in required preambles,realize the correct demodulation of user′s data;the scheme has the characteristics of a big rage of modify frequency,fast speed to achieve carrier synchronization,simple structure,and can operate steadily on the environment of low SNR.