Method for sensing wireless microphones using augmented spectral correlation function

摘要

A method for detecting wireless microphone signals based on an augmented spectral correlation function is provided. The method includes obtaining an augmented spectral correlation function (SCF) of acquired digital signals based on a SCF of the digital signal and a conjugate SCF proposed in the present invention, calculating a statistic, and comparing it with a decision threshold simulated or calculated through a predetermined method to determine whether the digital signal is a wireless microphone signal. With the proposed augmented SCF, the present invention overcomes a difficulty in sensing TV white space, namely, the inability of most existing detection methods to effectively distinguish between narrowband interferences and wireless microphone signals. Meanwhile, the detection method has low algorithm complexity and is easy to implement in real systems.

主权项

1. A method, implemented by a computing device, for detecting a wireless microphone signal in digital TV white space based on an augmented spectral correlation function (SCF), characterized in that the method comprises:
acquiring, by the computing device, a preprocessed time-domain digital signal x[n] in a particular TV band, calculating a SCF Ŝxα(ƒ) of the digital signal x[n], calculating a conjugate SCF Ŝxα(ƒ)c of the digital signal x[n], and calculating the augmented SCF Ŝxα(ƒ)α of the digital signal x[n]; and calculating, by the computing device and using the augmented SCF Ŝxα(ƒ)α, a statistic Tp of the digital signal x[n], simulating or calculating a threshold γ with a predetermined method, and determining whether the acquired digital signal x[n] is a wireless microphone signal based on a result of a comparison between the statistic Tp and the threshold γ.