Radar detection method and system using low-resolution FFTS

摘要

A method of identifying radar in a wireless device includes detecting an event corresponding to receipt of a signal by the wireless device. The event can include an analog to digital converter (ADC) saturation, a radio frequency (RF) saturation, and/or an ADC power high condition. Notably, the gain change in the wireless device is delayed for a first predetermined time period. Data preceding the event for the first predetermined time period can be buffered. A first low-resolution fast Fourier transform (FFT), wherein low-resolution FFTs are referred to as short FFTs, can be performed with the buffered data. The first short FFT can be processed. When results of the processing indicate the signal is radar, the radar can then be identified.

主权项

1. A receiver for a wireless device, the receiver comprising:
an analog front end (AFE); an analog to digital converter (ADC) configured to receive an output of the AFE; an ADC correction block configured to receive an output of the ADC, and in response, provide a corrected ADC signal; an ADC saturation determination block configured to identify an ADC saturation event based on the corrected ADC signal; a short fast Fourier transform (FFT) block configured to perform a short fast Fourier transform based on the corrected ADC signal, wherein the short fast Fourier transform has a lower resolution than a fast Fourier transform used by the wireless device to demodulate a received packet; a DC-filter configured to receive an input based on the corrected ADC signal; an ADC power determination block configured to receive an output of the DC-filter; and an automatic gain control (AGC) block configured to detect and identify radar based on outputs of the ADC saturation determination block, the short FFT block, and the ADC power determination block.