Patent ID: 7593692

Claim:
A radio transceiver, comprising: radio front end for receiving, amplifying and down converting and filtering a radio frequency (RF) signal to produce a low frequency received signal; analog to digital converter operatively coupled to receive the low frequency received signal, the ADC producing a digital low frequency signal; baseband processor coupled to receive and process the digital low frequency signal; radar detection circuit coupled to receive the digital low frequency signal, wherein the radar detection circuit further includes: multiplication circuitry for receiving and squaring a low frequency digital signal; moving average filter coupled to selectively receive an output signal produced by the multiplication circuitry, the moving average filter producing a moving average filtered signal; first conversion block for converting a magnitude of the moving average filtered signal into decibel values; and a threshold comparison state machine coupled to receive an output of the first conversion block in decibel values, the threshold comparison state machine for measuring rise time, fall time, and magnitude levels of received signals and detects a received radar pulse pattern and produces a corresponding control signal indicating whether a radar signal has been detected to the baseband processor; and wherein the processor is coupled to receive rise time, fall time, and magnitude levels of received signals from the threshold comparison state machine, and wherein the processor determines whether the radar signal has been received and, if so, inhibits transmissions on overlapping frequency bands.