1. Modeling of Unwanted and Blocking Interference Modes European Communications Office Jean-Philippe Kermoal 05 October 2010 EUROPEAN COMMUNICATIONS OFFICE Nansensgade 19 DK-1366 Copenhagen Denmark Telephone: + 45 33 89 63 00 Telefax: + 45 33 89 63 30 E-mail: ledevendec@ero.dk Web Site: http://www.ero.dk

2. SEAMCAT Workshop Marc Le Devendec / ECO Page 205 October 2010  Interfering Modes  Unwanted Emissions Case  Blocking Case

3. SEAMCAT Workshop Marc Le Devendec / ECO Page 305 October 2010 Interference Calculations Interfering Modes Interference Criteria Unwanted and Blocking Signals

4. SEAMCAT Workshop Marc Le Devendec / ECO Page 405 October 2010 Unwanted Emissions Victim fvfv Receiver Bandwidth Interfering System fIfI Interfering emission mask fIfI Interferer emission mask

5. SEAMCAT Workshop Marc Le Devendec / ECO Page 505 October 2010 Victim Link Frequency

6. SEAMCAT Workshop Marc Le Devendec / ECO Page 605 October 2010 Victim Link / Victim Receiver Reception bandwidth Interference Criterion

7. SEAMCAT Workshop Marc Le Devendec / ECO Page 705 October 2010 Interfering Link Frequency

8. SEAMCAT Workshop Marc Le Devendec / ECO Page 805 October 2010 Interfering Link/Interfering transmitter Power Emission Mask

9. SEAMCAT Workshop Marc Le Devendec / ECO Page 905 October 2010 Interfering Link/Interfering transmitter/Unwanted emissions mask Default value erroneous value See the following presentations...

10. SEAMCAT Workshop Marc Le Devendec / ECO Page 1005 October 2010 Interfering Link/Victim receiver -> Interfering transmitter Path Att = + 32.4 + 20 x log (f (MHz)) + 20 x log (d (km)) Att = + 32.4 + 20 x log (900 MHz) + 20 x log (10 km) Att = + 111.5 dB

11. SEAMCAT Workshop Marc Le Devendec / ECO Page 1105 October 2010 Simulations... 10 km IRSS Unwanted = P in the victim bandwidth + Ge + Gr – Att (free space) IRSS Unwanted = 12 dBm + 0 dB + 0 dB – 111.5 dB IRSS Unwanted = - 99.5 dBm

12. SEAMCAT Workshop Marc Le Devendec / ECO Page 1205 October 2010 Results N = -110 dBm IRSS Unwanted = -99.5 dBm I/N = -99.5 – (-110) = 10.5 dB (  Calculated by SEAMCAT) Interference Criterion was: I/N = 0 (  Input to SEAMCAT)

13. SEAMCAT Workshop Marc Le Devendec / ECO Page 1305 October 2010 Results... Pe = 22.5 dBm I/N=0dB

14. SEAMCAT Workshop Marc Le Devendec / ECO Page 1405 October 2010 Blocking Victim fvfv Receiver Bandwidth Interfering System fIfI Interferer fIfI Rejection of the receiver

15. SEAMCAT Workshop Marc Le Devendec / ECO Page 1505 October 2010 Blocking: 3 Modes User Defined (dB): Rejection at the receiver Att Blocking = Block UD Protection Ratio (dB): Att Blocking = Block PR + C/(N+I) + 3 dB Sensitivity Mode (dBm): Maximum Acceptable Value of Power Att Blocking = Block Sens (dBm) – Sensitivity (dBm) + C/(N+I)

16. SEAMCAT Workshop Marc Le Devendec / ECO Page 1605 October 2010 But not so different Protection Ratio: Interfering Blocking Level = Pe + Ge + Gr – Att – Att Blocking Where: Att Blocking = Block PR + C/(N+I) + 3 dB If C/(N+I) = - 3 dB Att Blocking = Block PR - 3 dB + 3 dB = Block PR....equivalent to User Defined Mode If C/I = 0 dB Broadcast PR Mode...

17. SEAMCAT Workshop Marc Le Devendec / ECO Page 1705 October 2010 Example

18. SEAMCAT Workshop Marc Le Devendec / ECO Page 1805 October 2010 Blocking Mask Should be defined at the frequency of the Interferer Att blocking = 50 dB (e.g. Defined in ETSI Standards) fVfV fIfI

19. SEAMCAT Workshop Marc Le Devendec / ECO Page 1905 October 2010Simulations IRSS Blocking= Pe + Ge + Gr – Att (free space) – Att block IRSS Blocking= 33 dBm + 0 dB + 0 dB – 111.5 dB – 50 dB IRSS Blocking = - 128.5 dBm

20. SEAMCAT Workshop Marc Le Devendec / ECO Page 2005 October 2010 Results IRSS Blocking Level = - 128.5 dBm N = -110 dBm I/N = 0 dB (Criterion) always met

21. SEAMCAT Workshop Marc Le Devendec / ECO Page 2105 October 2010 Question? Can I make simulation for unwanted and blocking in the same workspace?

22. SEAMCAT Workshop Marc Le Devendec / ECO Page 2205 October 2010 Question: Can I make simulation for unwanted and blocking in the same workspace? 2 Interference Criteria / 2 runs

23. SEAMCAT Workshop Marc Le Devendec / ECO Page 2305 October 2010 Question: Can I run simulations for unwanted and blocking in the same workspace in a single run? If the interference criteria are not the same... You can compensate this when defining the mask (unwanted or blocking) Blocking: PR mode + Criterion: C/I=0 dB Unwanted: Criterion C/I=10 dB Remove 10 dB from blocking mask Criterion C/I=10 dB

24. SEAMCAT Workshop Marc Le Devendec / ECO Page 2405 October 2010 Questions? Thanks for your attention