METHOD AND APPARATUS FOR SPECTRUM SENSING OF FM WIRELESS MICROPHONE SIGNALS

摘要

Methods and apparatus for spectrum sensing for FM wireless microphone signals are provided. The spectrum sensing algorithm developed makes use of the property that the autocorrelation function of an FM signal is a sinusoidal function provided that the frequency deviation is much smaller than the carrier frequency and the correlation delay is small. Based on this property, a simple spectrum sensing algorithm for the FM signal is designed by computing the autocorrelation function of the received signal and matched filtering of the sinusoidal function. The spectrum sensor provided by this approach can reliably detect the target signals when a strong adjacent channel interference exists and the signal power is as low as -114 dBm.