User's Manual

WiMax Optical Fiber Repeater 10W Installation and Operation Manual
Document No. 913011900 Rev. 1.1 Proprietary Document
3-7
For optimal FWD and RVS balancing it is recommended to perform an additional fine-
tuning procedure on the FWD, after completing the previous processes.
1. Drive with a mobile station (MS) to the outskirts of the Remote unit coverage
area and observe the Mobile Ec/Io (in test mode), or walk indoors to the worst-
case location.
2. If the Mobile Ec/Io is low or marginal in the designated area,
optimize the azimuth and elevation of the distribution antenna.
3. Make changes according to the following criteria: if the Mobile Ec/Io is higher
than specified by the RF designer at the covered area border, decrease the
FWD gain in 1dB steps, until the MS Ec/Io reaches the desired value.
Do not in any case set the gain to a higher value than that determined in this
Section.
3.3.3 Host Unit RVS Gain Optimization
NOTE: The RVS gain must be approximately equal to the FWD gain of the Host
unit.
1. Drive with a MS to the outskirts of the system coverage area, and observe the Mobile
Tx Power (in test mode). Alternatively, walk indoors to the worst-case locations.
2. If the Mobile Tx Power reaches its maximum power (+23dBm), increase the RVS gain
in 1dB steps until the Mobile Tx Power drops by 2dB below its maximum value (Mobile
Tx power =+21dBm).
3. Do not, in any case, set the gain to a higher value than that set in this Section.
3.3.4 Noise Rise Check
After completion the optimization process, verify that the noise at the RVS channel
at the BTS did not rise more than 1-2dB due to the system installation.
In case of noise rise greater than 2dB, decrease RVS gain to fit the BTS noise-rise
parameter accordingly.