Handbook

ClearFill Star CDMA
1100187 Rev. 1.0
Page 30 of 152
3.2.5 Typical parameters
Typical parameters for the system design are:
Required signal strength level for CPICH: -80dBm…-85dBm
Required signal strength level for CPICH: -70dBm…-75dBm
(Strong outdoor signal present)
Reception probability (typical): 90%..95%
Coverage area for 1 RRH (typical): 2,500 sqm (25,000 sqft)
Typical propagation loss for antenna radius 28m (92 ft): -81 dB
(Office area with sheetrock walls)
3.3 Design step by step
This chapter explains the steps for designing a ClearFill®Star system.
The assumptions and parameters for the design are explained in section 3.2.
3.3.1 Determine coverage area per RRH
A ClearFill®Star RRH for CDMA with a CPICH output power of +4dBm (+14dBm carrier
output power) can cover an area of 2500 sqm (25,000 sqft) under standard conditions.
Deviations from the standard conditions have an impact on the propagation loss:
 Additional wall loss or obstacles reduce the coverage area
 Less walls or less attenuation increase the coverage area.
3.3.2 Number of RRH for Coverage 3G1x and EV-DO
The maximum distance between RRH and mobile should not exceed 28m (92 ft) (for
standard conditions).
It is possible to place several RRHs at the area to be covered by using RF-prediction
software tools. The prediction software calculates and shows the estimated RF-coverage
based on building and system parameters.
The quality of the coverage prediction is highly dependant on the accuracy of the building
parameters.
When designing a ClearFill®Star system without using a prediction tool, the first step should
be to divide the area to be covered (e.g. complete floor or room) by the estimated coverage
area of an RRH.