Xpd link calculator

XPD and fading

How to improve xpd for better MW transmission for cross-polar

configurations

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EAB/EIL-01:0001 Uen Rev PA1 Ericsson Confidential XPIC IMPEMENTATION PROCEDURE 2010-02-182 (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








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








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








› XPD LINK CALCULATOR








XPD recommendation








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 ofSite B › Step 10 : Calculate difference of Horizontal 1 to Vertical 1 transmitter › Step 11 : Calculate difference of Horizontal 2 to Vertical 2 transmitter








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 -74.3H1(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 -38.2H1(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 -38.2H1(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

Xpd link calculator

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