Efficient Band Occupancy and Modulation Parameter Detection

Abstract

Consider a communication scenario where several users share a band of frequencies dynamically. To share the band efficiently, it is desirable to obtain as much information as possible about its use in real time. Of vital importance for most digital communication systems and for the distinction between analog and digital communication signals is the determination of the baud or symbol rate $F_B$. We propose a frequency domain method that determines the band occupancy and the symbol rates for all signals in a frequency band simultaneously, without the need to first separate individual transmissions in the band. In a second step, specific signals of interest can then be converted back to the time domain with an appropriately lowered sampling rate to determine such parameters as the modulation method and the signal constellation.