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User Manual
Airbridge cBTS3612 CDMA Base Station
(AGC), multiplexing/demultiplexing of forward & reverse orthogonal (IQ) signals,
clock recovery and RF module operation & maintenance.
BIFU also performs the control over BTRM, including power-on initialization,
function configuration, alarm collection and reporting, and processing of O&M
related messages.
BRCU: BRCU is composed of 5 logic functional units: main/diversity transmit unit,
main/diversity receive unit and frequency source unit.
Transmit unit realizes analog up-conversion and spurious suppressed filtering
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for transmitted signals output by BIFU.
Main/diversity receive unit realizes analog frequency down-conversion, channel
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selective filtering and rec eived nose coefficient control for BTS main/diversity
received signals output by RLDU.
Frequency source unit is responsible for the synthesis of the low phase noise,
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high-stability local oscillation signals that are necessary for the analog
frequency conversion in transmit and receive paths.
2) BHPA
BHPA performs high power linear amplification for a transmitted carrier signal,
checks its own working status in real time and generates alarm. It is composed of
main signal power amplification unit and signal detection alarm unit. Signal detection
is to check whether the input is too excited, whether the temperature is too high or
whether the gain is lowered strikingly (device failure).
3) BTBM
BTBM performs structure support and signal communication between BTRM and
BHPA.
4) Duplexer Unit
There are following three types of Duplexers. They can be configured according to
actual requirements.
Combiner and Duplexer Unit (CDU): combining and filtering of two transmitting
carriers, transmitting and receiving signals duplexing and isolating, and diversity
receiving signal filtering. CDU operates at 800MHz band and 450MHz band.
Duplex er and Filter Unit (DFU): transmitting and receiving signal duplexing, isolating
and filtering of one channel, diversity receiving signal filtering. DFU operates at
450MHz band.
Dual Duplexer Unit (DDU): transmitting and receiving signals duplexing, isolating
and filtering of two channels, It does not provide combining function. DDU operates
at 1900MHz band.
2-4
System Description
2 Hardware Architecture
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