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Modelling of Emission and Blocking mask

Modelling of Emission and Blocking mask. European Communications Office Jean-Philippe Kermoal (ECO) October 2010. Outline. Input to SEAMCAT General CDMA Unwanted emission mask BS example UE example ACLR Blocking mask ACS Emission floor. Input to SEAMCAT.

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Modelling of Emission and Blocking mask

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  1. Modelling of Emission and Blocking mask European Communications Office Jean-Philippe Kermoal (ECO) October 2010

  2. Outline • Input to SEAMCAT • General • CDMA Unwanted emission mask • BS example • UE example • ACLR • Blocking mask • ACS • Emission floor

  3. Input to SEAMCAT • The emission mask defaults value • Remove the default using the Clear button. • Then use the add button to add the enough blank rows for half of the emission mask. • Note the format of the data: • Offset = MHz • Unwanted = dBc • Reference bandwidth = kHz

  4. Input to SEAMCAT • Then use the Sym button to get a symetric mask

  5. Reference/normalised bandwidth • Once SEAMCAT has generated the whole mask, first check that the values are in the correct order. • The unwanted emission diagram shows two masks The blue mask is normalised to 1MHz measurement bandwidth. The user may normalise his input to 1MHz bandwidth but it can be useful to input the mask in the bandwidth defined in the standard and allow SEAMCAT to create normalised mask. The red mask is the representation using the user defined reference bandwidth.

  6. Store your mask • Spectrum mask can be saved as .txt file • it can be reused for other workspaces using load buttons.

  7. General • The following range of attenuation is considered, for a system of 30dBm using a 20kHz emission bandwidth. • The reference bandwidth for the attenuation is 10kHz. • Within the emission bandwidth the reference bandwidth is taken equal to the emission bandwidth. • Note: The technical specifications of the receiver and transmitter are commonly extracted from the ETSI standard (see http://www.etsi.org/WebSite/Standards/Standard.aspx)

  8. Spectrum emission mask values, BS maximum output power P  43 dBm (TS25.104) CDMA emission mask -BS example • Assuming a BS Tx power of 43 dBm, and with addition of the ITU-R SM.329 limit above 12.5 MHz

  9. CDMA emission mask -UE example

  10. ACIR = f(ACLR, ACS) • ACIR = adjacent-channel interference ratio • In UL, the dominant part of ACIR is due to the UE adjacent channel leakage (ACLR) i.e. ACSBS is very large compare to ACLRUE and ACIR ≈ ACLRUE. • In DL, the dominant part of ACIR is due to the UE frequency selectivity (ACS) i.e. ACLRBS is very large compare to ACSUE and ACIR ≈ ACSUE

  11. ACLR in SEAMCAT • No use of the ACLR directly. • Emission spectrum Mask is used

  12. Blocking Mask Receiver Mask Rx bandwidth Blocking: • User-defined mode • Protection ratio • Sensitivity modes Rejection of the receiver fI fv Blocking Response = filtering (user defined mode) Receiver Mask Rx bandwidth Blocking: Rejection of the receiver fI fv Blocking Response = ACS (ETSI) + Blocking (ETSI) (PR and Sensitivity mode)

  13. BS blocking Mask

  14. ACS in SEAMCAT • ACS is the same as the blocking attenuation input

  15. Emission Floor • Useful when power control is used • This emission floor mask (frequency offset (MHz), emission floor (dBm), reference bandwidth (MHz)).

  16. Thank you - Any Questions?

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