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研究了循环平稳信号的基本特性,通过分析通信系统中典型信号的循环平稳特性,得到了循环平稳的特征参数循环频率和信号特征参数的关系。在此基础上研究了该理论在通信领域的具体应用,提出了应用谱相关理论完成弱信号检测及信号特征参数(信号载频、码元速率)的估计方案,仿真实验结果表明,在-17dB的条件下能够进行信号的无误检测,可在-10dB条件下进行特征参数的无误估计。
The basic characteristics of the cyclostationary signal are studied. By analyzing the cyclostationary characteristics of the typical signal in the communication system, the relationship between the cyclostationarity of the cyclical frequency of the characteristic parameter and the signal characteristic parameter is obtained. Based on this, the application of this theory in communication field is studied. The scheme of detecting weak signal and signal characteristic parameters (signal carrier frequency and symbol rate) is proposed based on spectral correlation theory. The simulation results show that at -17dB Under the conditions of the signal can be detected without error, -10dB conditions for the unambiguous estimation of the characteristic parameters.