关键词: 通信技术, 混沌同步, 滤波, 互谱MUSIC算法, 频率估计

Abstract:

    This paper presents a parameter estimation method for weak sinusoidal signal embedded in chaotic noise. This method is based on error feedback synchronization, in which only one driving variable passing through a filter is used. First, the filtered mixed signals (chaotic signal, white noise and sinusoidal signal) are used to drive a new response chaotic system, which is the same with the driving system. If chaotic synchronization occurs, there exists sinusoidal component in the error data series between driving and response signals. The crossspectral MUSIC method is used to estimate the sinusoidal frequency in the error data. This method is suitable for the situation where the interference signals are the mixture of strong chaotic signals and white noises. Simulation results show that the proposed method is simple and effective.

Key words: communication, chaotic synchronization, filter, crossspectral MUSIC method, frequency estimation