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March 2008 doc.: IEEE 802.22-08/0104r0
IEEE 802.22.1 Packet Error Rates
for MSF1 and MSF2
IEEE P802.22 Wireless RANs Date: 2008-03-19
Authors:
Name Company Address Phone email
Stephen Kuffner Motorola Schaumburg, IL, 847.538.4158 stephen.kuffner@
motorola.com
USA
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Submission Slide 1 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
Abstract
This submission presents the simulated packet error rates
for TG1 subframes MSF1 and MSF2 with packets
structured according to P802.22.1 D2 [1], and considers
the impact on the interference protection link margin
Submission Slide 2 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
Simulation Conditions
• One trial = one MAC subframe
• Channels are AWGN or WRAN-B
• No frequency offset or other impairments considered
• WRAN-B used fixed magnitude rays per [2] with
uniform random phase draws per trial
• Unquantized soft decoding on MSF1
• 200 errors counted per chip SNR point
– Should give 95% confidence that PER values are within about
±15% of actual value
– i.e., 1% true PER will give between 0.87% to 1.15% simulated
PER with 95% confidence
Submission Slide 3 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
Packet Error Rates for 17 byte MSF1 with Rate-1/2 Convolutional Code using
Draft 2 Puncturing Pattern (34 bytes total) and Unquantized Soft Decoding
compared with 51 byte MSF2 in AWGN and WRAN-B Channels
0
10
MSF2 AWGN
MSF2 WRAN-B
MSF1 AWGN
MSF1 WRAN-B
X: -3.813 X: 3.452 X: 9.482
Y: 0.1005 Y: 0.1002 Y: 0.1004
-1
10
X: 2.303
Y: 0.1003
PER
-2
10
X: -2.575 X: 4.847 X: 10.29 X: 17.89
Y: 0.01008 Y: 0.009983 Y: 0.01001 Y: 0.01001
-5 0 5 10 15 20
chip SNR, dB
Submission Slide 4 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
Results Summary
MSF1 chip SNR (dB) MSF2 chip SNR (dB)
PER
AWGN WRAN-B AWGN WRAN-B
10% -3.8 2.3 3.5 9.5
1% -2.5 10.3 4.8 17.9
Submission Slide 5 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
Link Margin Considerations
• Express required chip SNR in terms of interference
link and sensing link parameters [3]
• Assumptions:
– Pb = 250 mW, Bbc = 77 kHz; Pw = 4 W, Bw = 5.625 MHz
– Beacon ant. gain = 2 dBi; microphone Rx ant. gain = 2 dBi;
WRAN sensing ant. gain = 0 dBi
– maximum 200 kHz-averaged upfade on interference path
• F↑ ≈ 2.5 dB for WRAN-B
– ΔNF ≈ 0 dB, ΔG ≈ 0 dB, I/Nmax = 0 dB
– Δ is propagation related parameter (next slide…)
– 6.6 + Δ – 2.5 = 4.1 dB + Δ > Ec/No
P B
10 log b w (Gb ,tx G w, sens Gm ,rx ) F ( NFw NFm ) I / N m ax E c / N o
P B
w bc
G NF
Submission Slide 6 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
Link Margin Results
• Antenna-height related path loss clutter parameter Δ
[4]
– P.1546 rural, 10 m beacon height: Δ = 16.8 dB
• 4.1 + 16.8 = 20.9 dB > Ec/No
• Both MSF1, MSF2 < 1% PER
– Hata large city, 3 m beacon height: Δ = 2.7 dB
• 4.1 + 2.7 = 6.8 dB > Ec/No
• MSF1 PER = 3%
• MSF2 PER = 18.8%
Submission Slide 7 Stephen Kuffner, Motorola
March 2008 doc.: IEEE 802.22-08/0104r0
References
[1] P802.22.1/D2, “Part 22.1: Ehanced Protection for
Low-Power, Licensed Devices Operating in Television
Broadcast Bands,” October 2007.
[2] IEEE 802.22-05/0055r7, “WRAN Channel Modeling,”
E. Sofer, G. Chouinard, September 2005.
[3] IEEE 802.22-08/0059r0, “Beacon Link Margin by Two
Methods,” S. Kuffner, February 2008.
[4] IEEE 802.22-07/0148r0, “TG1 Link Margin
Calculator,” S. Kuffner, March 2007.
Submission Slide 8 Stephen Kuffner, Motorola
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