Patent ID: 9647719
Date: 2017-05-09
CPC Classifications: H04B

Claim:
1. A method of sensing the presence or absence of a predetermined signal in a shared spectrum, the method comprising: receiving a first radio frequency (RF) signal; down-converting the first RF signal to a baseband signal; generating a set of frequency components of the baseband signal by transforming the baseband signal to the frequency domain; generating a matched filter output signal by multiplying the frequency components of the baseband signal with a set of matched filter coefficients associated with the predetermined signal in the frequency domain; transforming the matched filter output signal to a time domain; determining a value indicative of a power of the matched filter output signal in the time domain; comparing the value indicative of the power of the matched filter output signal with a threshold value to determine whether the predetermined signal is present in the shared spectrum; and causing reconfiguration of a transmitter to transmit a second RF signal in the shared spectrum based on whether the predetermined signal is determined to be present in the shared spectrum after comparing the value indicative of the power of the matched filter output signal with the threshold value.