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 (bobames@suirg.org) www.suirg.org Sign-up for Interference e-News on

web site SUIRG fact sheet available in back

Thank You