US Patent 7668262 Systems, methods, and apparatuses for coarse spectrum-sensing modules

Systems, methods, and apparatuses are provided for coarse-sensing modules that are operative for providing initial determinations of spectrum occupancy. The coarse-sensing modules may include a wavelet waveform generator providing a plurality of wavelet pulses, and a multiplier that combines the wavelet pulses with an input signal to form a correlation signal. The coarse sensing modules may further include an integrator that receives the generated correlation signal from the multiplier, where the integrator determines correlation values from integrating the correlation signal, and a spectrum recognition module in communication with the integrator that determines an available spectrum segment based at least in part on the correlation values. In addition, the spectrum recognition module may determine an available spectrum segment by utilizing information from a spectrum usage database, where the spectrum usage database includes information associated with one or more known signal types.