Structure And Principle - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
(convolutional code, TURBO code), interleaving, spreading, modulation and data
multiplexing, and converts them into high-speed signals. Then the signals are
processed by a dedicated processing chip and transmitted through the radio
interface side of the channel processing board.
In reverse direction, data received by BCPM are demultiplexed, demodulated,
de-interlaced and decoded (convolutional code, TURBO code). Then under the
control of the high performance processor, the data are sent to BSC via BCIM in
the form of ATM cells.
The BCPM supports in-board and inter-board daisy chains, forming a
resource-processing pool.
High performance processor with two kernels and internal cache.

2.4.2 Structure and principle

The BCPM comprises the following parts as shown in Figure 2-4:
data bus
BRDM
BASB
Figure 2-4 Structure of BCPM
I. Multiplex/demultiplex module
In forward direction, baseband data in the channel processing board are multiplexed
into high-speed signals and sent to radio side in the form of differential signals. In
reverse direction, the high-speed differential signals are demultiplexed and sent to
baseband processing chip.
II. Baseband processing module
The QUALCOMM new generation processing chip is used to perform forward and
reverse baseband data processing. With the help of in-board and inter-board data
BCPM
High
speed
Multiplex/demultiplex
module
Backplane
bus module
Clock
module
Chapter 2 Baseband Subsystem
Baseband
Data bus
processing
module
Control bus
Data bus
CPU module
Power supply
module
2-8
System Principle
Data bus
RS232
BCKM