基于循环平稳特性的直扩信号检测与参数估计

直接序列扩频技术具有很强的抗干扰能力，高保密性等优点，因此在军事和民用通信等领域得了广泛的应用。由于直扩信号具有上述优点，在复杂噪声中对其进行检测和参数估计是一个非常困难的课题。本文利用循环谱理论，根据直扩信号和高斯噪声在循环平稳性上的差异，实现在循环频率轴上对二者进行检测和参数估计。仿真实验结果表明，此方法在低信噪比条件下具有很好的检测效果。

Detect DSSS and Estimate its Parameters based on Cyclic Spectrum Correlation Technology

The Spread Spectrum technology has been used widely in fields such as military and civil communications because of its strong anti-interference, excellent secrecy. Thus it is very difficult to detect DSSS and estimate its parameters because of its features we mentioned above. The direct sequence spread signal and Gaussian noise are different in cyclostation based on spectrum theory, so this paper presents a method that makes use of cyclic spectrum correlation technology to detect DSSS and estimate its parameters. The simulation results show that the algorithm is effective.