1. Wireless Microphone Sensing
March 2007
doc.: IEEE /0zzzr0
November 2007
IEEE P Wireless RANs Date:
Wireless Microphone Sensing
Authors:
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Gerald Chouinard, CRC
Gerald Chouinard

2. Time to validate Operational channel: 2 s Backup channels: 6 s
March 2007
doc.: IEEE /0zzzr0
November 2007
Time to validate
Operational channel: 2 s
Backup channels: 6 s
Channel availability Check Time:
A candidate channel needs to have been available for 30 seconds before becoming a backup channel
Detection and confirmation of incumbent
If presence of incumbent is detected by BS or CPEs and confirmed by the BS, the entire cell moves to the first backup channel or the CPEs where it was detected are dissallowed from the network
In the case of a backup channel, this channel is returned to the “null” set unless the CPEs where incumbents were detected are to be dissallowed from the use of this channel when it becomes the operating channel.
Gerald Chouinard, CRC
Gerald Chouinard

3. Operational channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Operational channel availability check
Co-channel validation (N)
Wireless microphone protection level:
Functional Requirement Document: 20 dB(uV/m) (equivalent to the field strength produced by a CPE at 10 m with an emission level of 4.8 uV/m at 3 m in 120 kHz)
Calculations: 32.7 dB(uV/m) (see next slide)
Functional Requirement Document is too restrictive by 12.7 dB
Gerald Chouinard, CRC
Gerald Chouinard

4. November 2007
Maximum field strength allowed before interference to wireless microphones
Gerald Chouinard, CRC

5. WRAN coverage and co-channel operation with wireless microphones
November 2007
WRAN coverage and co-channel operation with wireless microphones
Edge of coverage of the WRAN BS (e.g., 17 km for 4 W EIRP, 31 km for 100 W EIRP)
28.8 dB(uV/m)
Δ att_1.5m/10m dB(uV/m)
Wireless microphone operation
Area where, if wireless microphones are detected, the BS cannot operate on the same TV channel
Area where CPEs need to change frequency R2
Area where CPEs need to reduce their transmit power as a function of their distance to the wireless microphone operation R1
Area where, if wireless microphones are detected, the nearby CPEs need to either change frequency or reduce their transmit power
Gerald Chouinard, CRC

6. Operational channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Operational channel availability check
Co-channel validation (N)
Co-channel sensing needs to be done during quiet periods on channel N, and possibly on channels N+/-1 if WRAN operation exists (see leakage from WRAN out-of-band emission on adjacent channels in next slides)
Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel N because of IF filter leakage from N+\-1?
Base station cannot operate co-channel if there is a wireless microphone operation within R1 from the BS
For distance larger than R1 from the base station, CPEs need to reduce power or change frequency if they are within R2 from a wireless microphone operation to protect it
For smaller distances from a wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and need to change frequency
Gerald Chouinard, CRC
Gerald Chouinard

7. Operational channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Operational channel availability check
Adjacent channel validation (N+\-1)
Interference can be generated from WRAN signal emission in the adjacent channels
Extent of interference will depend on the allowed WRAN out-of-band emission in the adjacent channels
WRAN RF Mask considerations =>
Gerald Chouinard, CRC
Gerald Chouinard

8. November 2007
WRAN RF Mask
Gerald Chouinard, CRC

9. November 2007
WRAN RF Mask
Gerald Chouinard, CRC

10. November 2007
WRAN RF Mask
Gerald Chouinard, CRC

11. November 2007
WRAN RF Mask
Gerald Chouinard, CRC

12. November 2007
WRAN RF Mask
Gerald Chouinard, CRC

13. WRAN coverage and adjacent-channel operation with wireless microphones
November 2007
WRAN coverage and adjacent-channel operation with wireless microphones
Assuming 33 dB as for the FCC Mask
Edge of coverage edge of the WRAN BS (e.g., 17 km for 4 W EIRP, 31 km for 100 W EIRP)
28.8 dB(uV/m)
Δ att _1.5m/10m dB(uV/m)
Wireless microphone operation
Area where, if wireless microphones are detected, the BS cannot operate on the same TV channel R4
Area where CPEs need to change frequency R3
Area where CPEs need to reduce their transmit power as a function of their distance to the wireless microphone operation
Area where, if wireless microphones are detected, the nearby CPEs need to either change frequency or reduce their transmit power
Gerald Chouinard, CRC

14. Operational channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Operational channel availability check
Adjacent channel validation (N+\-1)
Adjacent channel sensing for TG1 beacon and wireless microphone is needed to protect incumbent operation from WRAN out-of-band emission in adjacent channels
Sensing needs to be done during quiet periods on channel N, and possibly on channels N+/-2 if WRAN operation exists to avoid incumbents being masked by WRAN signal spill-over from either side [Is there a place where N+2 can still operate without interfering with incumbent on N+1but would mask this operation where the CPE on N is located?]
Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel K because of IF filter leakage from signal on K+\-1?
Gerald Chouinard, CRC
Gerald Chouinard

15. Operational channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Operational channel availability check
Adjacent channel validation (N+\-1)
Base station cannot operate on N if there is wireless microphone operation on N+/-1 within R3 from the BS
For distances larger than R3 from the BS, CPEs need to reduce power or change frequency if it is within R4 from wireless microphone operation to protect it from CPE spill-over
For smaller distances from wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and need to change frequency
Gerald Chouinard, CRC
Gerald Chouinard

16. Backup channels availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Backup channels availability check
Co-channel validation (K)
Co-channel sensing needs to be done during quiet periods on channel K, and possibly on channels K+/-1 if WRAN operation exists (see leakage from WRAN out-of-band emission on adjacent channels in previous slides)
Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel K because of IF filter leakage from K+\-1?
Base station will not be able to operate co-channel if a wireless microphone operation is within R1 from the BS
For distances larger than R1 from the base station, CPEs will need to reduce power or change frequency if they are within R2 from wireless microphone operation to protect it
For smaller distance from wireless microphone operation, CPE cannot reduce power sufficiently to keep contact with the base station and will need to change frequency
Gerald Chouinard, CRC
Gerald Chouinard

17. Backup channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Backup channel availability check
Adjacent channel validation (K+\-1)
Adjacent channel sensing for TG1 beacon and wireless microphone is needed to protect incumbent operation from eventual WRAN out-of-band emission in adjacent channels
Sensing needs to be done during quiet periods on channel K, and possibly on channels K+/-2 if WRAN operation exists to avoid incumbents being masked by WRAN signal spill-over from either side [Is there a place where K+2 can still operate without interfering with incumbent on K+1but would mask this operation where the CPE on K is located?]
Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel K because of IF filter leakage from signal on K+\-1?
Gerald Chouinard, CRC
Gerald Chouinard

18. Backup channel availability check
March 2007
doc.: IEEE /0zzzr0
November 2007
Backup channel availability check
Adjacent channel validation (K+\-1)
Base station will not be able to operate on K if there is wireless microphone operation on K+/-1 within R3 from the BS
For distances larger than R3 from the BS, CPEs will need to reduce power or change frequency if they are within R4 from a wireless microphone operation to protect it from CPE spill-over
For smaller distances from wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and will need to change frequency
Gerald Chouinard, CRC
Gerald Chouinard