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: Telefax: Web Site:

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

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

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

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

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

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

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

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...

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

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

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

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

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

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)

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...

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

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

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 – dB – 50 dB IRSS Blocking = dBm

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

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

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

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

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