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XPD Link Calculator.ppt

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XPD Link Calculator.ppt

  1. 1. XPD and fading How to improve xpd for better MW transmission for cross-polar configurations
  2. 2. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 2 (7) About XPD – What is XPD – XPD is the polarization discrimination between two signals transmitted on opposite polarization planes (horizontal and vertical) – XPD of a path is mainly defined by two factors – XPD0 of the antennas – Propagation conditions along the path › XPD has to be considered in CCDP (co-channel dual polarized) equipment configurations
  3. 3. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 3 (7) How to improve xpd › The propagation conditions cannot be changed. We have to accept them › But the XPD0 of the antennas can be increased › Different antenna types have different XPD0 values › Standard antennas: 25dB < XPD0 < 30dB › High performance antennas: 30dB < XPD0 < 35dB › XPD improved HP antennas: 35dB < XPD0 < 40dB › Ultra high performance antennas: 30dB < XPD0 < 40dB › Super high performance antennas: > 40dB
  4. 4. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 4 (7) Conclusion for cross-polar transmission › Higher XPD0 values of the antennas result in higher XPD values for the path › The higher the XPD0 values of the antennas, the better the countermeasure against fading › A higher XPD0 value of the antennas can give a significant improvement for the transmission under difficult propagation conditions
  5. 5. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 5 (7) › XPD LINK CALCULATOR
  6. 6. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 6 (7) XPD recommendation
  7. 7. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 7 (7) How to calculate › How calculate XPD value at XPIC link. › Step 1 : Transmitter OFF of all radio transmitter › Step 2 : First Vertical Radio transmitter ON of Site A › Step 3 : Second Vertical Radio transmitter ON of Site A › Step 4 : First Horizontal Radio transmitter ON of Site A › Step 5 : Second Horizontal Radio transmitter ON of Site A › Step 6 : First Vertical Radio transmitter ON of Site B › Step 7 : Second Vertical Radio transmitter ON of Site B › Step 8 : First Horizontal Radio transmitter ON of Site B › Step 9 : Second Horizontal Radio transmitter ON of Site B › Step 10 : Calculate difference of Horizontal 1 to Vertical 1 transmitter › Step 11 : Calculate difference of Horizontal 2 to Vertical 2 transmitter
  8. 8. EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-18 8 (7) Example showing XPD difference Site A Site B MMU2F(SLOT) 2 3 4 5 18 19 20 21 RADIO POS V1 V2 H1 H2 V1 V2 H1 H2 XPD VALUE XPD VALUE TX OFF ALL -91.8 -90.9 -90 -90.1 -90.9 -90.3 -79.6 -76.5 V1 on of Site A -91.8 -90.9 -89.6 -89.6 -41 -39.8 -78.5 -65.2H1(20)-V1(18)=37.5 H2(20)-V2(18)=-25.4 V2 on of Site A -91.8 -90.9 -89.6 -89.6 -40.1 -38.5 -64.5 -74.3 H1(20)-V1(18)=- 24.4 H2(20)-V2(18)=-35.8 H1 on of Site A -91.8 -90.9 -89.6 -89.6 -70.2 -73.6 -40.1 -38.2 H1(20)-V1(18)=- 30.1 H2(20)-V2(18)=-35.4 H2 on of Site A -91.8 -90.9 -89.6 -89.6 -70.2 -74.9 -40.1 -38.2 H1(20)-V1(18)=- 30.1 H2(20)-V2(18)=-36.7 V1 on of Site B -41.6 -40.1 -80.5 -67.1 -90.9 -90 -79.6 -76.5H1(4)-V1(2)=-38.9 H2(4)-V2(2)=-27 V2 on of Site B -39.8 -38.5 -67.4 -74.6 -90.9 -90 -79.6 -76.5H1(4)-V1(2)=-27.6 H2(4)-V2(2)=36.1 H1 on of Site B -72.7 -76.1 -40.6 -39.5 -90.6 -90.6 -79.3 -76.5H1(4)-V1(2)=32 H2(4)-V2(2)=36.6 H2 on of Site B -68 -79.6 -40.4 -38.5 -90.9 -90 -79.6 -76.5H1(4)-V1(2)=27.6 H2(4)-V2(2)=41

Editor's Notes

  • 2010-02-18
  • 2010-02-18
  • 2010-02-18

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