ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

In-band emission in purely In-band emission in purely passive bands: passive bands:

some examples with the some examples with the Ultra Wide Band Ultra Wide Band

transmissiontransmission

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Current studiesCurrent studies

2002 : Creation of TG 1/82002 : Creation of TG 1/8 CEPT : SE 24 followed this year by CEPT : SE 24 followed this year by TG 3 TG 3 Preliminary draft ECC report on UWB impact Preliminary draft ECC report on UWB impact on other services below 10.6 GHz on other services below 10.6 GHz

• 1 400-1 427 MHz 1 400-1 427 MHz • 6 425-7 250 MHz6 425-7 250 MHz• 10.6-10.7 GHz10.6-10.7 GHz

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Passive SensorsPassive SensorsCharacteristicsCharacteristics

Protection requirement EESS (passive): Protection requirement EESS (passive): •1 400-1 427 MHz: -158.3 dBm/MHz with a 1 400-1 427 MHz: -158.3 dBm/MHz with a sensitivity of 0.05 K, sensitivity of 0.05 K, •1 400-1 427 MHz : -165.3 dBm/MHz with a 1 400-1 427 MHz : -165.3 dBm/MHz with a lower sensitivity of 0.01 K ,lower sensitivity of 0.01 K ,•6 425-7 250 MHz6 425-7 250 MHz : -159 dBm/MHz, : -159 dBm/MHz,•10.6-10.7 GHz: -156 dBm/MHz.10.6-10.7 GHz: -156 dBm/MHz.

Recommendation ITU-R SA.1029-2Recommendation ITU-R SA.1029-2Receiver antenna gain : 9 to 45 dBiReceiver antenna gain : 9 to 45 dBi

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

UWB CharacteristicsUWB Characteristics

1400 – 1427 MHz 6425 – 7250 MHz 10.6 – 10.7 GHz

Indoor-75 dBm/MHz -41.3 dBm/MHz

-51.3 dBm/MHz

Outdoor -61.3 dBm/MHz

Indoor -80.9 dBm/MHz -41.3 dBm/MHz -51.3 dBm/MHz

Outdoor -90.9 dBm/MHz -41.3 dBm/MHz -61.3 dBm/MHz

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Interference ScenarioInterference ScenarioAggregate interference : methodology : Aggregate interference : methodology : NTIA, FANTASMANTIA, FANTASMAFree space propagation + indoor usageFree space propagation + indoor usage

UWB Density (/km2) 100 1 000 10 000

Activity factor 5 % 5 % 5 %

Density of active UWB transmitters

(/km2)

5 50 500

% outdoor 20 % 20 % 20 %

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Results of interference Results of interference analysisanalysis

PSD limits in dBm/MHz

Maximum tolerable density of active UWB transmitters (/km²) for both outdoor and indoor usage

1400 – 1427 MHz 6425 – 7250 MHz 10.6 – 10.7 GHz

FCC mask 6 1 194

Slope mask 62 1 194

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Results of interference Results of interference analysisanalysis

Band Band 1400 – 1427 MHzDensity of UWB transmitters per

km²

Required UWB Power spectral

(both indoor and outdoor) density

in dBm/MHz

Required UWB Power spectral density in dBm/MHzOutdoor limit (dBm/MHz)

Indoor limit (dBm/MHz)

1 -68 -74 -64

10 -78 -84 -74

100 -88 -94 -841000 -98 -104 -94

10000 -108 -114 -104

-75 dBm/MHz

-90.9 dBm/MHz

-80.9 dBm/MHz

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Results of interference Results of interference analysisanalysis

Band Band 6425 – 7250 MHzDensity of UWB transmitters

per km²Required UWB Power

spectral (both indoor and outdoor) density in dBm/MHz

1 -42

10 -52

100 -62

1000 -72

10000 -82

-41.3 dBm/MHz

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Results of interference Results of interference analysisanalysis

Band Band 10.6 – 10.7 GHzDensity of UWB

transmitters per km²Required UWB Power spectral density in

dBm/MHz

Outdoor limit (dBm/MHz)

Indoor limit (dBm/MHz)

1 -40 -30

10 -50 -40

100 -60 -50

1000 -70 -60

10000 -80 -70

-61.3 dBm/MHz

-51.3 dBm/MHz

-61.3 dBm/MHz

-51.3 dBm/MHz

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Proposed UWB PSD limits Proposed UWB PSD limits to ensure compatibilityto ensure compatibility

1400 – 1427 MHz 6425 – 7250 MHz 10.6 – 10.7 GHz

Indoor-75 dBm/MHz -41.3 dBm/MHz

-51.3 dBm/MHz

Outdoor -61.3 dBm/MHz

Indoor -80.9 dBm/MHz -41.3 dBm/MHz -51.3 dBm/MHz

Outdoor -90.9 dBm/MHz -41.3 dBm/MHz -61.3 dBm/MHz

-88 dBm/MHz -62 dBm/MHz -60 dBm/MHz

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Apportionment of Apportionment of interferencesinterferences

Rec ITU-R SA.1029-2 : Rec ITU-R SA.1029-2 : Interference criteria for satellite passive remote sensing Maximum level of interference on an aggregate basis To use them as single entry criteria underestimate the aggregate impact on passive services Necessity to apportion the criteria among different interference sources

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Apportionment of Apportionment of interferencesinterferences

Example in the band 1 400 – 1 427 MHzExample in the band 1 400 – 1 427 MHz WP 8D has considered a 5% apportionment for unwanted emissions For bands under 5.340 the apportionment should be very small Idea within WP 7C : apportionment of 1 to 5% for UWB.

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004

Case of RR No.5.340Case of RR No.5.340

5.340 5.340 All emissions are prohibited in the following bands: All emissions are prohibited in the following bands: (WRC-2000)(WRC-2000) Questionned by lawyersQuestionned by lawyers RR No. 4.4RR No. 4.4 Rules of ProceduresRules of Procedures UWB are not spurious or unwanted UWB are not spurious or unwanted emissionsemissions

ESF Workshop on Protection of Passive Bands – Cagliari, 28 & 29 October 2004