Radar detection circuit for a WLAN transceiver
First Claim
1. A radio transceiver, comprising:
- radio front end circuitry operable to produce an ingoing communication signal having in-phase and quadrature-phase components on one or more receive signal paths;
analog-to-digital converter (ADC) operatively coupled to receive the ingoing communication signal, the ADC producing an ingoing digital signal having digital in-phase and quadrature-phase signal components to a signal processor for processing;
a radar detection block operably disposed within each of the one or more receive signal paths to receive the ingoing digital signal wherein the signal processor inhibits transmission of outgoing digital signals whenever a traditional or non-traditional radar signal has been detected.
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Accused Products
Abstract
A single chip radio transceiver includes circuitry that enables detection of radar signals to enable the radio transceiver to halt communications in overlapping communication bands to avoid interference with the radar transmitting the radar pulses. The radio transceiver is operable to evaluate a number of most and second most common pulse interval values to determine whether a traditional radar signal is present. The radio transceiver also is operable to FM demodulate and incoming signal to determine whether a non-traditional radar signal such as a bin-5 radar signal is present. After FM demodulation, the signal is averaged wherein a substantially large value is produced for non-traditional radar signals and a value approximately equal to zero is produced for a communication signal that is not FM modulated with a continuously increasing frequency signal. Gain control is used to limit incoming signal magnitude to a specified range of magnitudes.
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Citations
32 Claims
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1. A radio transceiver, comprising:
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radio front end circuitry operable to produce an ingoing communication signal having in-phase and quadrature-phase components on one or more receive signal paths;
analog-to-digital converter (ADC) operatively coupled to receive the ingoing communication signal, the ADC producing an ingoing digital signal having digital in-phase and quadrature-phase signal components to a signal processor for processing;
a radar detection block operably disposed within each of the one or more receive signal paths to receive the ingoing digital signal wherein the signal processor inhibits transmission of outgoing digital signals whenever a traditional or non-traditional radar signal has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A multiple input multiple output (MIMO) radio transceiver, comprising:
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a first receive path comprising radio front end circuitry operable to produce a first ingoing digital signal;
first radar detection block operably disposed to receive the first ingoing digital signal to detect presence a radar signal;
a second receive path comprising radio front end circuitry operable to produce a second ingoing digital signal;
second radar detection block operably disposed to receive the second ingoing digital signal to detect presence the radar signal; and
wherein the first and second radar detection blocks each comprise logic for detecting traditional radar signals. - View Dependent Claims (18, 19, 20)
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21. A radio transceiver, comprising:
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a first receive signal path operable to produce an ingoing signal;
a baseband processor operably disposed to receive the ingoing signal to process the ingoing signal;
a first radar detection circuit operable to receive the ingoing signal and to determine whether a radar signal is present;
the first radar detection circuit further including;
gain determination circuitry for producing a gain signal;
FM demodulation circuit operably disposed to receive the ingoing signal and the gain signal wherein the FM demodulation circuit is operable to determine a radar signal is present by demodulating and ingoing signal and determining that the demodulated ingoing signal is characterized by a specified gain characteristic. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method of detecting a radar signal, comprising:
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producing I and Q digital waveform signals from a baseband filtering block;
producing a gain control signal;
FM demodulating the I and Q digital waveform signals based in part upon the gain control signal;
averaging the FM demodulated I and Q digital waveform signals;
evaluating the averaged FM demodulated I and Q digital waveform signals to determine presence of a radar. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification