Patent ID: 8670477
Filing Date: 2014-03-11
Classification: H04J

Abstract:
1. A method of operating a radio system including a transmitter and a receiver and operating over at least a first range of frequencies in a band of operation, the method comprising: receiving a radio signal at a receiver, the radio signal including frequencies in the band of operation; obtaining a time limited segment of the signal to produce a pulse; spreading frequency components of the pulse out in time to produce a chirp; measuring the amplitude of the chirp over time to determine the magnitudes of at least some of the frequency components spread out in time of the pulse; determining information about the frequency spectrum of the band of operation using the determined magnitudes of frequency components of the pulse; conveying at least a portion of the information about the frequency spectrum of the band of operation from the receiver to the transmitter; and using the at least a portion of the information about the frequency spectrum of the band of operation to control how the transmitter makes transmissions; wherein at least a second time limited segment is obtained to produce at least a second pulse, and frequency components of the at least a second pulse are spread out in time to produce at least a second chirp, and the amplitude of the at least a second chirp is measured over time to determine magnitudes of at least some of the frequency components spread out in time of the at least a second pulse, wherein the frequency components whose magnitude are determined of the pulse occur over a second range of frequencies and the frequency components whose magnitude is determined of the at least a second pulse occur over at least a third range of frequencies different from the second range of frequencies, and information about the frequency spectrum of the band of operation in the second range of frequencies is determined using the determined magnitudes of frequency components of the pulse and information about the frequency spectrum of the band of operation in the third range of frequencies is determined using the determined magnitudes of frequency components of the at least a second pulse.