Abbreviations:
Pinm :
Power received at the MS side ; Mf : Loss suffers from fading and other
residual losses.
Poutb
:Transmitter output power; Lcb : Loss in combiner ; Lfb : Loss in feeder; Gab : BTS antenna’s gain ; Ld : Path Loss
Gam : MS antenna’s gain ; Pmn : Noise suffered at the MS side
; Pinb :
Power received at the BTS side
Pout : MS output power ; GdB : BTS antenna diversity gain ; Pbn : Noise suffered at the BTS side
Downlink path consideration :
Pinm
(–102dBm) + Mf = Poutb － Lcb －Lfb +
Gab －Ld + Gam － Pmn ------------ （1）
Uplink path consideration :
Pinb +
Mf = Poutm
+Gam －Ld +Gab + GdB － Lfb －Pbn ------------ （2）
Assume :
Pmn = Pbn ; Poutb = Poutbal ; Pinm = Mssens ; Pinb = BTSsens
From (1) and (2), we get :
Poutb – Pinm =
Poutm + GdB – Pinb
+ Lcb ==>
Poutbal = Poutm
+ GdB + Lcb
+ ( Pinm – Pinb
) ==>
Poutbal = Poutm
+ GdB + Lcb
+ ( MSsens – BTSsens
)
Footnote :
Poutbal
denote the BTS output power when link budget is achieved.
For more details about description of Antenna
feeder design-antenna selection Please click here ,you will know details about it.
Coverage of special area
Adopt
distributed antenna in high building
•tunnel、subway、underground
•industrial and commercial area
•high-rise
•blind area
Antenna selection
The
choice of antenna has an important effect on the network coverage.
The
requirements on antenna :
1)Satisfying the coverage area. AND
2)Does not cause interference to other
cells.
The
key considerations of the antenna are :
1) Antenna gain.
2) Antenna
azimuth
3) Antenna
polarization
Different
choice of antenna is being used in the following situations :
1) urban,
sub-rural and rural area
2) Mountain,
flat land ( sea ), highway and tunnel area
3) Building
interior
Common
antenna supplier :
Andrew、Allgon、Antel、 Kathrein、and
etc
-coverage area characteristic
-Common antenna product
How to Choose An Antenna
•How
to Choose An Antenna is an important part that may determine the network
quality.
•Antenna
shall be selected as per the coverage, service quality requirements within the
base station service area, traffic distribution, topographic, landscape
conditions, and consideration to the coverage and
interference details of the entire network;
•The
usage of antennas may be divided into the following types according to the
topographic conditions or traffic distribution:
Urban, suburb, rural area, highway,
hilly area, coastal area, tunnel, indoor, etc. 
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