1. TG1 Required Detection SNRs Versus Protected Radii
July 2008
doc.: IEEE /xxxxr0
July 2008
TG1 Required Detection SNRs Versus Protected Radii
IEEE P Wireless RANs Date:
Authors:
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Stephen Kuffner, Motorola
Stephen Kuffner, Motorola

2. July 2008
doc.: IEEE /xxxxr0
July 2008
Abstract
To protect microphone receivers over the full TG1 keepout zone, the WRANs need to detect beacons at lower SNRs depending on the keepout zone radius. This submission determines the required detection SNR versus the protected radius.
Stephen Kuffner, Motorola
Stephen Kuffner, Motorola

3. Interference Scenario
July 2008
Interference Scenario
NEWS7
reporter
camera operator
news gathering truck w/ beacon
WRAN Rp Rd
Stephen Kuffner, Motorola

4. Interference Scenario: Another View
July 2008
Interference Scenario: Another View
interference region
interference range
microphone protected region Ri
WRAN θ
interference angle Rd Rp
detection range
protected radius
Beacon
For a beacon using a protected radius Rp, the microphone receivers can be that much closer to the WRAN than the beacon
Note all aggregated microphone receivers must be within the protected radius
Stephen Kuffner, Motorola

5. Set Up Path loss model is simple two ray with h2 dependence
July 2008
Set Up
Path loss model is simple two ray with h2 dependence
In the 4th law region,
This path loss model can be applied to both the interference path and the detection path
Both paths can be solved for Rd , equated, and solved for the required S/N
Stephen Kuffner, Motorola

6. Link Equations Beacon-to-WRAN detection path
July 2008
Link Equations
Beacon-to-WRAN detection path
WRAN Tx-to-microphone interference path
Solve for Rd
Note Rd – Rp is the desired max interference range Ri
Stephen Kuffner, Motorola

7. Link Parameters July 2008 Parameter Meaning Sb , Sw F↑, F↓ Bb , Bw
Beacon, WRAN Tx power spectral density
F↑, F↓
Interference up-fade, beacon down-fade
Bb , Bw
Beacon chip BW, WRAN BW
Antenna, interference, and receiver noise temperatures for microphone receiver
hb, hw, hm
Beacon, WRAN, and microphone Rx antenna heights
Antenna, interference, and receiver noise temperatures for WRAN receiver
Beacon, WRAN Tx antenna gain
I/N
Interference-to-noise ratio at microphone receiver
WRAN, microphone Rx antenna gain
S/N
Beacon signal SNR at WRAN receiver
Stephen Kuffner, Motorola

8. Combined Link Equation
July 2008
Combined Link Equation
Combining the two path equations for Rd, solve for the required S/N
Note the down fade F↓ has been absorbed into a faded S/N since faded S/N values are what we have from the PER simulations
Stephen Kuffner, Motorola

9. Computation Assumptions
July 2008
Computation Assumptions
Beacon VHF transmit power = 50 mW
Beacon UHF transmit power = 250 mW
Beacon antenna radiating centers = 3.5 m or 9.5 m
WRAN antenna height = 9 m
Beacon Tx antenna gain = 2 dBi
Microphone Rx antenna gain = 0 dBi
WRAN Tx antenna gain = 6 dBi VHF, 8 dBi UHF
WRAN Rx antenna gain (sensing) = 0 dBi
Receiver Noise Temps = 1200K, Antenna Temps = 300K, Interference Temps = 0K
WRAN EIRP = 36 dBm, WRAN BW = MHz
Protected Radii = 0, 500 m, 1500 m, and 4500 m
I/N = 0 dB
Stephen Kuffner, Motorola

10. July 2008
VHF Results
Stephen Kuffner, Motorola

11. July 2008
UHF Results
Stephen Kuffner, Motorola

12. July 2008
Stephen Kuffner, Motorola

13. WRAN-B Faded Channel Profile [1]
July 2008
WRAN-B Faded Channel Profile [1]
Ray 1
Ray 2
Ray 3
Ray 4
Ray 5
Ray 6
Mag (dB) -6 -7
-22
-16
-20
Delay (μsec) -3 2 4 7 11
This channel model is typically used as the worst-case channel model in IEEE analyses
Stephen Kuffner, Motorola

14. July 2008
Conclusions
For large protected radii, the required SNR and detection probability can be increased by using a higher beacon antenna
Stephen Kuffner, Motorola

15. July 2008
References
[1] IEEE /0055r7, “WRAN Channel Modeling,” E. Sofer, G. Chouinard, Sept. 2005
Stephen Kuffner, Motorola