Narrow band interference determined by second and fourth order norms
AssigneeTexas Instruments Incorporated
InventorsBijoy Bhukania, Jawaharlal Tangudu, Karthik Ramasubramanian
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Abstract
Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.
Claims2
A method for detecting narrow band interference by an automatic gain control circuit in a receiver, comprising:
- A. estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal, the estimating a peak-to-average ratio includes determining a second order norm of the digital samples, the second order norm representing a root-mean-square voltage of the digital samples, and determining a fourth order norm of the digital samples, the fourth order norm being a statistical representation of peak amplitude characteristics of the digital samples;
- B. comparing the peak-to-average ratio with a threshold;
- and
- C. detecting the narrow band interference if the peak-to-average ratio is below the threshold.
Dependencies are inferred from the claim text.