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User Manual
Airbridge cBTS3612 CDMA Base Station
II. Frequency tolerance
Within the working temperature range, the average difference between the actual
carrier frequency of CDMA transmit sector and the carrier frequency of the dedicated
transmit sector is less than !5%10
A.2.2 Modulation Requirements
I. Synchronization & timing
Time tolerance for pilot frequency: The pilot time alignment error should be less than
3 µs and shall be less than 10 µs.. For base stations supporting multiple
simultaneous CDMA Channels, the pilot time tolerance of all CDMA Channels
radiated by a base station shall be within ±1 µs of each other.
Time tolerance of pilot channel and other code-division channels: in the same CDMA
channel, time error between the pilot channel and other forwarding code-division
channels is <!50ns.
The phase differences between the Pilot Channel and all other code channels
sharing the same Forward CDMA Channel should not exceed 0.05 radians and shall
not exceed 0.15 radians.
II. Waveform quality
The normalized cross correlation coefficient, ρ, shall be greater than 0.912 (excess
power < 0.4 dB)..
A.2.3 RF Output Power Requirement
I. Total power
Total power is the mean power delivered to a load with resistance equal to the
nominal load impedance of the transmitter.. The total power of this system is
+43dBm (20W), the deviation in all kinds of environmental conditions shall not
exceed +2dB and -4dB.
II. Pilot power
The Pilot Channel power to total power ratio shall be within ±0.5 dB of the configured
value.
Appendix A Technical Performance of Receiver
- 8
(!0.05ppm )of the designated frequency.
A-12
System Description
and Transmitter
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