20.Antenna Selection(V0.1)
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Transcript of 20.Antenna Selection(V0.1)
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CDMA Antenna Selection
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Improve coverage and reduce exceed-
area handoff;
Improve network quality, enhance
resource utilization efficiency
Reduce the time of network optimization,
and save manpower and material
resources;
Reasons
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Frequency and polarization Radiation pattern, horizontal BW, vertical BW and gainDowntiltNull fill and side lobe suppressionFront to Back Ratio,max input power,third order intermodulationsuppression, isolation and so on
Main contents of antenna selection
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correspond with system frequency
meet bandwidth requirement
Frequency
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Urban:double-polarization antennas;
Suburban and rural:single polarization antennas;
Polarization
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Horizontal BW, vertical BW and gain should be considered together.
Horizontal BW, vertical BW and gain
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small horizontal BW antenna is suitable for dense urban where the quantities of BTS sites and traffic are large and coverage radius is small;large horizontal BW antenna is suitable for rural and open area where the traffic is small and coverage radius is large
Horizontal BW
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small vertical BW antenna is suitable for areas where terrain is plain, buildings are distributed separately and average height is low. Large vertical BW antenna is suitable for complex and big fall terrain. In areas where buildings are densely located and average height is high, if antenna height is lower than average height around, large vertical BW antenna is recommended, otherwise small vertical BW antenna is recommended
Vertical BW
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Urbanhorizontal BW: 65°, vertical BW: 7°~10°gain 15~18dBiSuburban and rural
Directional antenna: horizontal BW: 90°, vertical BW: 5°~7°gain: 15~18dBi
Omni antenna: vertical BW: 5°~7°gain: 9~12dBi
Advice for different terrain and clutter (1)
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Open area such as water, desert Directional antenna:
horizontal BW: 90° or 105 °, vertical BW: 5°~7°
gain: 14~18dBiOmni antenna:
vertical BW: 5°~7°gain: 9~12dBi
Advice for different terrain and clutter (2)
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Narrow and long areas such as road, railway
If the way is straight, antenna should be of 20°~30°
horizontal BW, 5°~7° vertical BW and high gain.
If the way is winding or village and small town need
to be covered at the sides of the way, antenna with
large horizontal BW, 5°~7° vertical BW can be
used.
Advice for different terrain and clutter (3)
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Complex and large fall terrainif the height of antenna is higher than that of
coverage areas, the vertical BW can be 10°~18°;if the fall is very large and many coverage areas is higher than the antenna, the vertical BW can be
18°~30°.
Advice for different terrain and clutter (4)
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Urban α = arctg ( H / L ) * 180 / π + β/2 – e_γ
Suburban, rural,highway and seaα = arctg ( H / L ) * 180 / π – e_γα: original downtilt,degree;H: height of antenna,meter;L: distance between antenna and coverage boundary, meter;β: vertical BW, degree ;e_γ: electrical downtilt of antenna, degree
Downtilt
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sites with small coverage radius and big ; high-level position sites in urban ;Sites with relatively high-level, such as hilltop;high position sites with omni antenna;In other situations that big downtilt is need。
Application situations of electrical downtilt
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upper side lobe suppression < -18dBlower null fill > -20dB
Null fill and side lobe suppression
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Front to Back Ratio:>25dB。Max input power:>200W。third order intermodulation suppression:
<-150dBC@2×43dBm。Isolation:>30dB。VSWR: <1.5。
Other parameters
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