Method and apparatus for detecting the presence of a signal in a frequency band using non-uniform sampling
AssigneeMotorola Mobility LLC
InventorAjay K. Luthra
Life of this patent
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Abstract
A method and apparatus for detecting the presence of a signal in a frequency band using non-uniform sampling includes an analog to digital converter (ADC) (110) for sampling an analog input signal (105) to create discrete signal samples (115), an ADC exciter (120) for exciting the ADC to sample at non-uniform time periods, a digital filter (130) for converting the discrete signal samples into an energy versus frequency spectrum (300), and an energy comparator (140) coupled to an output of the digital filter. The energy comparator (140) detects the presence of any frequency bands exceeding an energy setpoint.
Claims18
A method for detecting a presence of a signal comprising of:
- generating a pseudo random sequence to determine non-uniform time periods;
- sampling an analog input signal at the non-uniform time periods to produce discrete signal samples;
- determining that a signal is present in a frequency band when an energy versus frequency spectrum of the discrete signal samples exceeds an energy setpoint at the frequency band.
An apparatus for use in detecting a presence of a signal comprising:
- an analog to digital converter (ADC) for sampling an analog input signal to create the discrete signal samples;
- an ADC exciter, coupled to the ADC, for exciting the ADC to sample at non-uniform time periods;
- a digital filter, coupled to an output of the ADC, for converting the discrete signal samples into an energy versus frequency spectrum;
- and
- an energy comparator, coupled to an output of the digital filter, to detect a presence of a lobe in the energy versus frequency spectrum exceeding an energy setpoint.
Dependencies are inferred from the claim text.