Upload
domenic-strickland
View
213
Download
0
Tags:
Embed Size (px)
Citation preview
SUIRG WiMax Test Results
NSMA Meeting
Washington, D.C.
20, 21 May 2008
Agenda
SUIRG Brief Background
SUIRG Programs
SUIRG’s WiMax/FSS Test Activities
SUIRG’s Future
SUIRG Background
SUIRG’s Mission SUIRG is a not-for-profit international
assembly of parties, within which members work towards the reduction of radio frequency interference (RFI) through pro-active programs and education.
Who Belongs
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
Training & Certification Program Review & Certify Sat Ops Training Establish Certification Sat. Ops. DB
Interference Signature & Resolution DB Interference Source Identifier
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
Regulatory WG 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. Many countries opted in to enable authorization of WiMAX systems.
Initiative to use 14.0-14.5 GHz for Terrestrial Services
On-going Programs
New users in C-band downlinks
Future mobile phone networks(IMT Advanced, 4G, ….)
Broadband Wireless Access (BWA), WiMax, FWA, ….
Was considered by ITUWas considered by ITUIs currently being introduced country Is currently being introduced country by country worldwideby country worldwide
BWA or IMT in ANY part of “our” C-band downlink will have an impact on FSS reception in ALL of the band
Band commonly used by FSS satellitesAdditional band
(FSS, feeder links for MSS, …)
3.43.4 3.53.5 3.63.6 3.73.7 3.83.8 3.93.9 4.04.0 4.14.1 4.24.2Std. CStd. CExtended CExtended C
8
Circles of 150 km radius around earth stations
Registered Earth Stations (Except TVROs) in Europe Operating to Satellites Within 3400-4200 MHz
Impact of Protection of Earth Stations in Overlapping Frequency Bands
SUIRG WiMAX and C-Band FSS Compatibility Testing
Why: Provide additional quantifiable data for administrations and other interested organizations
When: 1-10 October 2007 Where:
Florida: subscriber testing (< 1Km) Maryland & Virginia: Hub testing (2-12 Km)
SUIRG Field Testing
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.
SUIRG Field Testing
Satellite Receiver
WiMAX Device
Spectrum Analyser
Receive Satellite Antenna
Base Station
Video Monitor
Base Antenna height >100'Down angle 10 degreesHPBW Horz 60 degreesHPBW Vert 10 degrees
17 dBi GainMax EIRP 38dBm
X-distance
Subscriber Station
Subscriber Antenna height >10'HPBW Horz 18 degreesHPBW Vert 18 degrees
18 dBi Gain
Y-distance
Test Horn
Typical Test Configuration
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 WTA: World Teleport Association NAVSEA NSWCDD Q53 (US Navy)
Test Program
Particular attention was on the following: 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 Program
Testing was done in 2 phases 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.
Test Plan
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
Measurement 9 Distance: 0.87 km Angle: AZ-118° WiMax power: +29
dBm I/N: +23 dB
Phase 2 Hub testing Tests were performed at 2 different remote
FSS locations (Maryland and Virginia)
Phase 2 Test Plan
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
Water TowerFSS Site #2
WiMax/FSS Compatibility Test Results
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
Phase 2 Measurement local
WiMax/FSS Compatibility Test Results
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 Measurement long
Phase 2: Hub unit testing 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 Test Results
Additional analysis was performed based on the results of this testing 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 Field Testing
Washington DC
Locus of locationsat which the I/N would not exceed -10 dB
WiMax base station
50 km
Richmond
200 km
200 km
78W 77W
38N
39N
Phase 2 Interference Loci
30
Distortion of Received FSS
Spectrum by BWA Signal
B
Att 0 dB*
RBW 300 kHz* VBW 10 kHzSWT 65 ms
*
Ref -35 dBm
Center 1.425 GHz Span 100 MHz10 MHz/
3 PKVIEW
1 PKVIEW
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
Date: 12.JUN.2006 12:42:16
Tests Results Show Overdrive of LNBUS Navy testing
B
Att 0 dB*Ref -35 dBm
100 MHz/Center 1.35 GHz Span 1 GHz
*
*
RBW 300 kHzVBW 10 kHzSWT 340 ms
3 PKVIEW
2 PKVIEW
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
1
Marker 1 [T2 ] -31.03 dBm 1.648000000 GHz
Date: 12.JUN.2006 12:49:04
BWA Carrier 3.5 GHz-31 dBm
3.3 GHz4.3 GHz
Intermodulation Product
Satellite Signals
Intermodulation Products
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.
WiMax/FSS Compatibility Testing Results Summary
32
FSS Joint Voices: WTA, CASBAA, GVF, SUIRG, SAP-REG, APSCC, ESOA, SIA
FSS Joint Voices: WTA, CASBAA, GVF, SUIRG, SAP-REG, APSCC, ESOA, SIA
Additional Notes on C-Band Spectrum Issues
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
WiMAX Opt-in Countries
34
Conclusions
BWA/IMT in part, or all, of the FSS C-Band Will Be incompatible with general FSS reception in Any Part of C-Band 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)
Thank you to the following: US Navy NAVSEA NSWCDD Q53 Section
Contributed some of these slides SES-NewSkies SES-Americom AsiaSat General Dynamics Sat COM Division RSI/Vertex
Group Effort
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.
14.0-14.5 GHz for Terrestrial Services Petition
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’s Future
2008 SUIRG Interference Conference/Meeting 07-09 October 2008 Cairo, Egypt Hosted by NileSat $450 non-member attendance fee
SUIRG Update
Interested in SUIRG’s activities Bob Ames ([email protected]) www.suirg.org Sign-up for Interference e-News on
web site SUIRG fact sheet available in back
Thank You