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