SUIRG WiMax Test Results
NSMA Meeting
Washington, D.C.
20, 21 May 2008
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Agenda
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SUIRG Brief Background
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SUIRG Programs
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SUIRG’s WiMax/FSS Test Activities
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SUIRG’s Future
SUIRG Background
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SUIRG’s Mission
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SUIRG is a not-for-profit international
assembly of parties, within which members
work towards the reduction of radio
frequency interference (RFI) through proactive programs and education.
Who Belongs
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Membership grown to 37 members from 20 countries
 Communication Satellite Operators
 Satellite Service Users
 Satellite Monitoring Equipment Vendors
 Other Organizations concerned with Interference
Founding Members: Intelsat, PanAmSat, Inmarsat,
NewSkies, QinetiQ, Glowlink
Latest member GASCOM from Russia
On-going Programs
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Training & Certification Program
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Review & Certify Sat Ops Training
Establish Certification Sat. Ops. DB
Interference Signature & Resolution DB
Interference Source Identifier
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Contact and location data embedded in data stream
Advent Communications DVE4000 employs SUIRG’s
specification
Working with WBU/ISOG on industry standard inclusion of
Carrier ID in the MPEG data stream as a standard operating
practice by 2011.
On-going Programs
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Regulatory WG
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BWA/WiMax shared usage of FSS C-band
Active participant in industry letters to multiple ITU members
requesting non-approval at the WRC meeting
Performed field testing of shared use of C-Band frequencies
with WiMax equipment.
Working with other organizations (i.e. GVF) on post-ITU
recommendations.

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Many countries opted in to enable authorization of WiMAX systems.
Initiative to use 14.0-14.5 GHz for Terrestrial Services
New users in C-band downlinks
Is currently being introduced country
by country worldwide
Was considered by ITU
Future mobile phone networks
(IMT Advanced, 4G, ….)
Broadband Wireless Access
(BWA), WiMax, FWA, ….
3.4
3.5
3.6
Extended C
Additional band
(FSS, feeder links
for MSS, …)
3.7
3.8
3.9
4.0
Std. C
4.1
4.2
Band commonly used by FSS satellites
BWA or IMT in ANY part of “our” C-band downlink will have an impact on FSS
reception in ALL of the band
Impact of Protection of Earth Stations in
Overlapping Frequency Bands
Registered Earth Stations (Except TVROs) in Europe Operating to Satellites Within 3400-4200 MHz
Circles of 150 km radius around earth stations
8
SUIRG WiMAX and C-Band
FSS Compatibility Testing
SUIRG Field Testing
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Why: Provide additional quantifiable
data for administrations and other
interested organizations
When: 1-10 October 2007
Where:
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Florida: subscriber testing (< 1Km)
Maryland & Virginia: Hub testing (2-12 Km)
SUIRG Field Testing
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What was tested?

Measure interference generated by
WiMax Base Station (BS) transmissions
into a satellite receiving station by
measuring satellite channel C/N, I/N, BER
and power levels at varying angles and
distances to the 2.4 meter FSS antenna.
Typical Test Configuration
Subscriber Antenna height >10'
HPBW Horz 18 degrees
HPBW Vert 18 degrees
18 dBi Gain
Test Horn
Base Antenna height >100'
Down angle 10 degrees
HPBW Horz 60 degrees
HPBW Vert 10 degrees
17 dBi Gain
Max EIRP 38dBm
Receive
Satellite
Antenna
Y-distance
WiMAX
Device
X-distance
Satellite Receiver
Base Station
Subscriber
Station
Video Monitor
Spectrum Analyser
Test Program

Procedure was verified and agreed upon by
the following organizations:

SUIRG: (Satellite Users Interference Reduction Group)
WBU-ISOG: (World Broadcasting Union – Inter Satellite

Operations Group)
GVF: Global VSAT Forum
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WTA: World Teleport Association
NAVSEA NSWCDD Q53 (US Navy)
Test Program
Particular attention was on the following:
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Output level from the WIMAX transmitter.
Distance of the WIMX transmitter from the
Satellite antenna.
Angle of WIMAX transmitter from Satellite
antenna bore sight.
LNB signal compression
As required, testing was conducted using
different transmit frequencies from the
WIMAX transmitter.
Test Plan

Testing was done in 2 phases

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Phase 1 simulated a mobile WiMax subscriber
unit operating within the immediate area of a
FSS antenna system
Phase 2 simulated a fixed WiMax Hub system
with its antenna mounted 50 meters up on a
water tower.
Phase 1 Subscriber Unit Test Area
Phase1 Subscriber Test Set-up
Baseline Video signal
Measurement 2 & 2a
 Distance: 0.17 km
 Angle: AZ-95°
 WiMax power: +3 dBm
 I/N: +38 dB
_____________________
 WiMax power: +29 dBm
 I/N: >+ 45 dB
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Measurement 9
Distance: 0.87 km
Angle: AZ-118°
WiMax power: +29
dBm
I/N: +23 dB
Phase 2 Test Plan
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Phase 2 Hub testing
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Tests were performed at 2 different remote
FSS locations (Maryland and Virginia)
Testing required moving the 2.4 M FSS
System unit around the test area via flat
bed truck
Following will provide the results from the
greater distance location (12 km distance)
New Direct TV System for Truckers???
Phase 2 Typical Test Set-up
FSS Site #2
Water Tower
WiMax/FSS Compatibility Test Results
Phase 2 Measurement local
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WiMax vs. FSS Angle: 16°
Distance: 2 km
Video Carrier CF: 3515 MHz
WiMax CF: 3510 MHz
WiMax power: +25 dBm
I/N: + 8 dB
BER: <1x10-5 when WiMax
@ 3515 MHz
WiMax/FSS Compatibility Test Results
Phase 2 Measurement long
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WiMax vs. FSS Angle: 16°
Distance: 12 km
Video Carrier CF: 3515
MHz
WiMax CF: 3510 MHz
WiMax power: +29 dBm
I/N: + 7 dB
BER: <1x10-5 when
WiMax
@ 3515 MHz:
Phase 2 Test Results
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Phase 2: Hub unit testing
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Tests were performed at 2 different remote FSS locations
using an 120° directional WiMax antenna mounted on a
water tower at around 50 meters to simulate a cell tower
installation.
Results identified problems within the test areas of
significantly greater distances (12 km) away from the FSS
antenna than Phase 1.
Further distance testing identified significant problems at the
max. (25 dBm) level and BER problems at the lower (3 dBm)
level.
The I/N level ranged from +33 to +9 dB and, as stated in
Phase 1 test results, this level will increase for each unit in
the area. Acceptable I/N level is -10dB.
Phase 2 Field Testing
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Additional analysis was performed
based on the results of this testing
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Based on pure line of sight propagation
loss the distance between WiMax and FSS
calculated to be 278km
Based on actual test site terrain data
calculated the distance to be around 50km
Phase 2 Field Testing
The following slide identifies the locus of
locations around the Phase 2 Virginia
site where the I/N at an FSS earth
station would not exceed -10 dB for
more than 20% of the time.
This data is based on the local wooded
terrain where the test was performed
Phase 2 Interference Loci
39N
Washington DC
50 km
200 km
WiMax base
station
38N
Locus of locations
at which the I/N would
not exceed -10 dB
Richmond
200 km
78W
77W
Tests Results Show Overdrive of LNB
US Navy testing
Ref -35 dBm
Distortion of
Received FSS
Spectrum by BWA
Signal
Ref -35 dBm
* Att
0 dB
* RBW
300 kHz
* VBW
10 kHz
0 dB
300 kHz
* VBW
10 kHz
Marker 1 [T2 ]
-31.03 dBm
SWT 340 ms
1.648000000
1
GHz
-35
-40
-45
Intermodulation
Products
2 PK
VIEW
-50
B
BWA Carrier
3.5 GHz
-31 dBm
3 PK
VIEW
-55
-60
SWT 65 ms
-65
-35
B
-40
-70
1 PK
VIEW
* Att
* RBW
-45
-75
Intermodulation
Product
-50
3 PK
VIEW
-80
-55
-85
-60
Center 1.35
4.3
GHz
-65
GHz
100 MHz/
-70
Date: 12.JUN.2006
-75
12:49:04
-80
Satellite Signals
-85
Center 1.425 GHz
10 MHz/
Span 100 MHz
30
Span 1 GHz
3.3 GHz
WiMax/FSS Compatibility Testing Results
Summary
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Phase 1 identified considerable
interference within several kilometers of a
FSS system.
Phase 2 identified a range of interference
between 50 km and well beyond the earth
curvature dependant upon the local terrain.
Additional Notes on C-Band Spectrum Issues
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WRC-07: 19 Oct 07 ITU Approves OFDMA as 6th Mobile
Protocol
Any Country Can Designate BWA in C-Band on a Secondary
Basis
Italy, Austria, U.K. Permit Mobility in Fixed WiMAX Spectrum
WiMAX Forum Starts 802.16e Certification in 2.3 GHz &
2.5 GHz; 3.4-3.6 GHz Not Likely Before FY09, Also 700 MHz to
Come.
700 MHz UHF TV Bands Ideally Suited Mobile, (U.S. Auction
$19B – Open Access)
In the U.S. IEEE 802.11y Jun 08, 3.65-3.7 GHz, 20 Watts
FSS Joint Voices: WTA, CASBAA, GVF, SUIRG, SAP-REG,
APSCC, ESOA,
SIA
32
WiMAX Opt-in Countries
Conclusions
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BWA/IMT in part, or all, of the FSS C-Band Will Be
incompatible with general FSS reception in Any Part of CBand in the same geographical area.
BWA/IMT may be compatible in a part of C-Band with FSS
reception by a small number of Earth Stations if:
 Appropriate exclusion zones around each of the earth
stations are established (2-150 km)
 Subscriber units only emit signals when contacted with a
base station & adjust power accordingly
 MIMO Beam Forming vice Spatial Diversity*
Introduction of BWA/IMT by one country can block FSS
reception in an adjacent country.
* Spatial Diversity can be very susceptible to un-licensed interferences (EMI)
34
Group Effort
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Thank you to the following:
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US Navy NAVSEA NSWCDD Q53 Section
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Contributed some of these slides
SES-NewSkies
SES-Americom
AsiaSat
General Dynamics Sat COM Division
RSI/Vertex
14.0-14.5 GHz for Terrestrial Services Petition
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Utility Telecom Council (UTC) is filing a
Petition for Rulemaking to the FCC to permit
shared, secondary terrestrial fixed service in
14.0 -14.5 GHz
UTC contracted an engineering firm to model
simultaneous operation with FSS and
determined 376,000 links are possible without
interference.
Satellite groups are developing a response to
the petition.
SUIRG’s Future

Do you have problems with satellite
interference?



Interference is a Quality of Service issue
Take a pro-active position to reduce
interference
If you support what SUIRG is doing then
please consider membership.
SUIRG Update

2008 SUIRG Interference
Conference/Meeting


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07-09 October 2008
Cairo, Egypt
Hosted by NileSat
$450 non-member attendance fee
Thank You

Interested in SUIRG’s activities
Bob Ames (bobames@suirg.org)
 www.suirg.org
 Sign-up for Interference e-News on
web site
 SUIRG fact sheet available in back
