Wireless device, system and method for discriminating radar transmissions from wireless network transmissions and wireless network having radar-avoidance capability
The disclosure provides a wireless device for use in a wireless network, systems and methods for identifying radar signals and for giving the wireless network a radar-avoidance capability. In one embodiment, the wireless device includes: (1) a pulse analyzer configured to make a determination whether a received pulse is a radar pulse and not a wireless network pulse and (2) a pulse reporter coupled to the pulse analyzer and configured to generate, if the determination is positive, a report thereof for transmission over the wireless network to a central aggregation node thereof.
1. A wireless device for operating in a wireless network, comprising:
a pulse analyzer configured to make a determination whether a pulse received at said wireless device is a suspected radar pulse and not a wireless network pulse; and
a pulse reporter, coupled to said pulse analyzer, configured to generate a report of said suspected radar pulse based on said determination for transmission over said wireless network to a central aggregation node of said wireless network, wherein said central aggregation node employs said report to determine if said suspected radar pulse is a radar pulse and transmits an alert to said wireless network based upon determining said suspected radar pulse is a radar pulse.
2. The wireless device as recited in claim 1 wherein said pulse analyzer filters out said received pulse if said pulse analyzer determines that said received pulse is noise.
3. The wireless device as recited in claim 1 wherein said pulse analyzer makes said determination by comparing said received pulse to a known characteristic.
4. The wireless device as recited in claim 1 wherein said pulse analyzer is embodied in a digital signal processor and employs programmable characteristics that distinguish said radar pulse, said wireless network pulse and noise.
5. The wireless device as recited in claim 1 wherein said pulse reporter is embodied in a MAC and said report includes a timestamp derived from a common timebase that indicates the arrival time of said received pulse and includes a pulsewidth of said received pulse.
6. The wireless device as recited in claim 1 wherein said received pulse is received on a channel of said wireless network and said report is transmitted over said channel to said central aggregation node.
7. The wireless device as recited in claim 1 wherein said wireless network pulse is an OFDM pulse conforming to IEEE 802.11a and said radar pulse is in a 5 GHz band.
8. For use in a wireless network, a method of identifying radar signals, comprising:
making, at a wireless device in said wireless network, a determination whether a received pulse is a suspected radar pulse and not a wireless network pulse;
generating a report of said suspected radar pulse based on said determination for transmission over said wireless network to a central aggregation node of said network;
analyzing, at said central aggregation node, a relationship between said report with other suspected radar reports from other wireless devices in said wireless network to determine whether a sequence of radar pulses exists; and transmitting an alert based on said analyzing to said wireless network.
9. The method as recited in claim 8 further comprising filtering out said received pulse if said received pulse is determined to be noise.
10. The method as recited in claim 8 wherein said making comprises making said determination by comparing said received pulse to a known characteristic.
11. The method as recited in claim 8 wherein said making is carried out in a digital signal processor and comprises employing programmable characteristics that distinguish said radar pulse, said wireless network pulse and noise.
12. The method as recited in claim 8 wherein said generating is carried out in a MAC and said report includes a timestamp derived from a common timebase.
13. The method as recited in claim 8 wherein said wireless network pulse is an OFDM pulse conforming to IEEE 802.11a and said radar pulse is in a 5 GHz band.
14. A system for giving a wireless network a radar-avoidance capability, comprising:
a plurality of wireless devices, each of said wireless devices including:
a pulse analyzer configured to make a determination whether a pulse received at said wireless device is a suspected radar pulse and not a wireless network pulse; and
a pulse reporter, coupled to said pulse analyzer, configured to generate a report, if said received pulse is said suspected radar pulse, for transmission over said wireless network; and
a central aggregation node configured to receive said reports of received radar pulses via said wireless network from said plurality of wireless devices and analyze relationships among said reports to make a determination whether a sequence of radar pulses exists and, if said determination is positive, generate and transmit a radar transmission alert to said wireless network.
15. The system as recited in claim 14 wherein said reports include timestamps derived from a common time base and said report analyzer analyzes time intervals between ones of said radar pulses.
16. The system as recited in claim 14 wherein said reports include widths of said radar pulses and said report analyzer analyzes widths of ones of said radar pulses.
17. The system as recited in claim 14 wherein said central aggregation node is Wireless Access Point.
18. The system as recited in claim 14 wherein said report analyzer filters out said received pulse if said pulse analyzer determines that said received pulse is noise.
19. The system as recited in claim 14 wherein said pulse analyzer makes said determination by comparing said received pulse to a known characteristic.