September 2015 doc.: IEEE 802.15- 15-15-0681-01-003d ......doc.: IEEE 802.15- 15-15-0681-01-003d...
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doc.: IEEE 802.15- 15-15-0681-01-003d Submission September 2015 Sebastian Rey, TU Braunschweig Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Why/when is AWGN a suitable channel model for wireless front-/backhaul? Date Submitted: 14 September 2015 Source: Sebastian Rey, Technische Universität Braunschweig Address: Schleinitzstr. 22, D-31806 Braunschweig, Germany Voice: +49-531-391-2439, FAX: +49-531-391-5192, E-Mail: [email protected] Abstract: This presentation gives reason that an Additive White Gaussian Noise Chanel is a suitable model for wireless front- and backhaul. In addition some clues on the necessary future coordination for such links is given.. Purpose: Input to provide a channel model for wireless front-/backhaul to TG3 d. Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
Transcript of September 2015 doc.: IEEE 802.15- 15-15-0681-01-003d ......doc.: IEEE 802.15- 15-15-0681-01-003d...
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Why/when is AWGN a suitable channel model for wireless front-/backhaul?
Date Submitted: 14 September 2015
Source: Sebastian Rey, Technische Universität Braunschweig
Address: Schleinitzstr. 22, D-31806 Braunschweig, Germany
Voice: +49-531-391-2439, FAX: +49-531-391-5192, E-Mail: [email protected]
Abstract: This presentation gives reason that an Additive White Gaussian Noise Chanel is a suitable
model for wireless front- and backhaul. In addition some clues on the necessary future coordination for
such links is given..
Purpose: Input to provide a channel model for wireless front-/backhaul to TG3 d.
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for
discussion and is not binding on the contributing individual(s) or organization(s). The material in this
document is subject to change in form and content after further study. The contributor(s) reserve(s) the right
to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE
and may be made publicly available by P802.15.
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
Sebastian Rey1, Thomas Kürner1
1 Institut für Nachrichtentechnik, Technische Universität Braunschweig, Germany
Why/when is AWGN a suitable channel
model for wireless front-/backhaul?
September 2015
Sebastian Rey, TU Braunschweig Slide 2
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 3
Outline
1. What has to be included in the channel model?
2. Simple Link Budget
3. Directive Antennas
• Impact of Directive Antennas on the Channel
• Real World Antennas
4. Conclusion
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 4
What has to be included in the channel?
– At first glance: every reflection/refraction/diffraction and scattering
– At second glance: everything less than 30 dB weaker than the direct path
– Typical distances
Backhaul few 100m to several km (TRD, ARD); Fronthaul few 100m (TRD)
– Additional 30 dB of free space pathloss (FSL) correspond to a factor of ~31.5 in
distance. For a direct path with a length of 100 m (1 km) a reflected path must at least have a length of 3.15 km (31.5 km) to be irrelevant
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 5
SNR = 0 dBm transmitter power (baseband)
+ Gtx dBi antenna gain (transmitter)
- LFSL dB free space loss
+ Grx dBi antenna gain (receiver)
- 7.6 dB noise figure
- Pn dBm thermal noise
(Simple) Link budget for the direct path
Required Antenna gain:
2x 26 dBi @ 100m
2x 36 dBi @ 1km
for SNR = ~10 dB
free space path loss at 300 GHz: 122 dB @100m 142 dB @1km
required BER of 10^-12 after FEC (TRD, ARD)
reasonable SNR = ~10 dB for a QPSK (see Doc. IEEE 802.15-15-13-0406-00-0thz)
carrier frequency: 300 GHz bandwidth: 50 GHz
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
– Suitable antennas are e.g.:
– dish antennas
– cassegrain antennas
– may include lenses
– Common properties:
– High antenna gain
– No grating lobes, usually no side lobes
– dimensions scale with gain and wave length
– Assuming a Gaussian antenna pattern in elevation and azimuth:
HPBW gain
1.5° 42.1 dBi
2.5° 37.7 dBi
5.0° 31.6 dBi
10° 25.6 dBi
15° 22.1 dBi
September 2015
Sebastian Rey, TU Braunschweig Slide 6
What kind of antenna?
HPBW
-3dB
gain-30 dB reached at (one antenna!)
2.4°
4.0°
7.9°
15.8°
23.7°
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 7
A simple worst case evaluation
HPBW gain gain-30 dB 2x gain-30 dB
1.5° 42.1 dBi 2.4° 1.7°
2.5° 37.7 dBi 4.0° 2.8°
5.0° 31.6 dBi 7.9° 5.6°
10° 25.6 dBi 15.8° 11.2°
15° 22.1 dBi° 23.7° 16.8°
100m
11.2°
9.9m
1km
2.8°
24.5m 14.8m
1.7°
d=9.9 m @100 m distance for 10° HPBW
d=24.5 m @1 km distance for 2.5° HPBW
d=14.8 m @1 km distance for 1.5° HPBW
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 8
A slightly more sophisticated evaluation
HPBW gain gain-30 dB 2x gain-30 dB
2.5° 37.7 dBi 4.0° 2.8°
1km
d
2.8°
– Only attenuations from the antenna pattern, FSL is negligable
– With equal antennas at the receiver and the transmitter a distance of ~25 m is required
– Additional reflection losses decrease the distance slightly (e.g. 3 dB)
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
– No dish antennas available at 300 GHz, yet
– Dish antennas for 71-86 GHz are available, e.g. Commscope VHLP200-80
Gain 41 dBi
HPBW 1.5°
– Also Antennas with only 0.5° HPBW are available at 80 GHz
September 2015
Sebastian Rey, TU Braunschweig Slide 9
And in the real world? (1)
Detail
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
– At less than 15m -30dB is reached for one of these antennas at Tx and Rx:
Gain 41 dBi
HPBW 1,5°
– With the Gaussian Antenna example 25m are required with a HPBW of 2.5° and also 15 m with ~1.5°
– (SNR increased by 2x 5 dB)
September 2015
Sebastian Rey, TU Braunschweig Slide 10
And in the real world? (2)
1km
d
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 11
Conclusion
– Multipath propagation is irrelevant (regarding the necessary planning process and the necessity to coordinate backhaul and fronthaul links with national regulators)
– AWGN sufficient for propagation aspects
– BUT still super wide band channels (more than ultra wide band)
doc.: IEEE 802.15- 15-15-0681-01-003d
Submission
September 2015
Sebastian Rey, TU Braunschweig Slide 12
Danke für Ihre Aufmerksamkeit!
(Thank you for paying attention!)
Dipl.-Ing. Sebastian Rey [email protected]
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