Method and system for coexistence of radar and communication systems
A method for scheduling wireless transmissions in a wireless communications network in the presence of pulsed interference includes receiving pulsed interference information, determining transmission opportunities based on the pulsed interference information, and when a transmission time interval (TTI) is less than a time of an opportunity of the transmission opportunities, transmitting a wireless signal during the opportunity.
1. A method for scheduling wireless transmissions in a wireless communications network in the presence of pulsed interference, the method comprising:
receiving pulsed interference information;
determining transmission opportunities based on the pulsed interference information; and
when a transmission time interval (TTI) is less than a time of an opportunity of the transmission opportunities, transmitting a wireless signal during the opportunity,
wherein determining transmission opportunities includes identifying off-times between radar pulses and determining a buffer time between pulse times, and
wherein the transmission opportunities are off times between pulses minus the buffer.
2. The method of claim 1 , wherein the buffer time is a receive window in which a radar receives reflections.
3. The method of claim 1 , wherein the buffer time is a saturation time during which a receiver is saturated by a received pulse.
4. The method of claim 1 , wherein determining transmission opportunities further includes determining radar dwell times.
5. The method of claim 4 , wherein determining radar dwell times includes:
identifying a plurality of consecutive radar pulses; and
comparing the plurality of consecutive radar pulses to a threshold value,
wherein the dwell time is a time during which a portion of the consecutive radar pulses exceeds the threshold value.
6. The method of claim 5 , wherein additional transmission opportunities are identified as times between dwell times.
7. A communications system, the system comprising:
a receiver that receives pulsed interference information;
a scheduling module that determines transmission opportunities based on the pulsed interference information, and
a transmitter that transmits a wireless signal during an opportunity of the transmission opportunities when a transmission time interval (TTI) is less than a time of the opportunity,
wherein determining transmission opportunities includes identifying off-times between radar pulses and determining a buffer time between pulse times,
wherein the transmission opportunities are off times between pulses minus the buffer.
8. The communications system of claim 7 , wherein the buffer time is a receive window in which a radar receives reflections.
9. The communications system of claim 7 , wherein the buffer time is a saturation time during which a receiver is saturated by a received pulse.
10. The communications system of claim 7 , wherein the scheduling module determines radar dwell times.
11. The communications system of claim 10 , wherein the scheduling module determines radar dwell times by identifying a plurality of consecutive radar pulses and comparing the plurality of consecutive radar pulses to a threshold value, and
wherein the dwell time is a time during which a portion of the consecutive radar pulses exceeds the threshold value.
12. The communications system of claim 11 , wherein additional the transmission opportunities are times present between dwell times.
13. A method for scheduling wireless transmissions in a wireless communications network in the presence of pulsed interference, the method comprising:
receiving pulsed interference information;
determining transmission opportunities based on the pulsed interference information; and
when a transmission time interval (TTI) is less than a time of an opportunity of the transmission opportunities, transmitting a wireless signal during the opportunity,
wherein determining transmission opportunities includes:
comparing a TTI to an off time between pulses;
when the TTI is less than the time between pulses, identifying the transmission opportunities in times between pulses; and
when the TTI is greater than the time between pulses, determining whether a dwell time is present in a pulse pattern.
14. A communications system, the system comprising:
a receiver that receives pulsed interference information;
a scheduling module that determines transmission opportunities based on the pulsed interference information, and
a transmitter that transmits a wireless signal during an opportunity of the transmission opportunities when a transmission time interval (TTI) is less than a time of the opportunity,
wherein the scheduling module determines transmission opportunities by:
comparing a TTI to an off time between pulses;
when the TTI is less than the time between pulses, identifying a transmission opportunity in the time between pulses; and
when the TTI is greater than the time between pulses, determining whether a dwell time is present in a pulse pattern.