Back to results
US 7,702,044 B2Granted
Radar detection and dynamic frequency selection
AssigneeMarvell World Trade Ltd.
InventorsBhaskar V. Nallapureddy, Tsunglun Yu, Yungping Hsu, Sek Kin Neng
Life of this patent
Estimating the term…
Abstract
A wireless network device includes a correlation module, an automatic gain control module, and a control module. The correlation module correlates a predetermined portion of a radio frequency (RF) signal and generates a correlation signal based thereon. The automatic gain control (AGC) module generates a gain control signal based on said RF signal. The control module selectively determines whether said RF signal is a radar signal based on said correlation signal and said gain control signal.
Claims36
A wireless network device, comprising:
- a correlation module that correlates a predetermined portion of a radio frequency (RF) signal and that generates a correlation signal based on said correlation of said predetermined portion;
- an automatic gain control (AGC) module that generates a gain control signal based on said RF signal;
- a converter module that converts said RF signal to a digital RF signal;
- and
- a control module
- that selectively determines whether said RF signal is a radar signal based on said correlation signal and said gain control signal, and
- that generates a reset signal that resets said AGC module when a value of said digital RF signal decreases to less than a predetermined value,
- wherein said control module:
- divides said digital RF signal into N equal segments during a period between said gain control signal and said reset signal that follows said gain control signal, where N is an integer greater than one;
- counts zero-crossings in each of said N equal segments;
- determines a first difference between said zero-crossings in a first one of said N equal segments and said zero-crossings in a second one of said N equal segments;
- determines that said RF signal is a chirp radar signal when said first difference is greater than or equal to a first predetermined threshold;
- and
- determines that said RF signal is a tone radar signal when said first difference is less than said first predetermined threshold.
11 more elements
A method for a wireless network device for detecting radar, the method comprising:
- correlating a predetermined portion of a radio frequency (RF) signal;
- generating a correlation signal based on said correlation;
- generating a gain control signal based on said RF signal;
- selectively determining whether said RF signal is a radar signal based on said correlation signal and said gain control signal;
- converting said RF signal to a digital RF signal;
- generating a reset signal that resets an automatic gain control (AGC) module when a value of said digital RF signal decreases to less than a predetermined value;
- dividing said digital RF signal into N equal segments during a period between said gain control signal and said reset signal that follows said gain control signal, where N is an integer greater than one;
- counting zero-crossings in each of said N equal segments;
- determining a first difference between said zero-crossings in a first one of said N equal segments and said zero-crossings in a second one of said N equal segments;
- determining that said RF signal is a chirp radar signal when said first difference is greater than or equal to a first predetermined threshold;
- and
- determining that said RF signal is a tone radar signal when said first difference is less than said first predetermined threshold.
9 more elements
A wireless network device, comprising:
- correlation means for correlating a predetermined portion of a radio frequency (RF) signal and generating a correlation signal based on said correlation of said predetermined portion;
- automatic gain control (AGC) means for generating a gain control signal based on said RF signal;
- converter means for converting said RF signal to a digital RF signal;
- and
- control means
- for selectively determining whether said RF signal is a radar signal based on said correlation signal and said gain control signal, and
- for generating a reset signal that resets said AGC means when a value of said digital RF signal decreases to less than a predetermined value,
- wherein said control means:
- divides said digital RF signal into N equal segments during a period between said gain control signal and said reset signal that follows said gain control signal, where N is an integer greater than one;
- counts zero-crossings in each of said N equal segments;
- determines a first difference between said zero-crossings in a first one of said N equal segments and said zero-crossings in a second one of said N equal segments;
- determines that said RF signal is a chirp radar signal when said first difference is greater than or equal to a first predetermined threshold;
- and
- determines that said RF signal is a tone radar signal when said first difference is less than said first predetermined threshold.
11 more elements
Dependencies are inferred from the claim text.