User's Manual

Product Controls DS-6210 Base Station Owner's Manual
6
RX Antenna 3
PA
TX Excitation
Unit
Baseband Signal Processing Unit
Power
Diversity Receiver
TX Antenna
ICB
RX Antenna 2
RX Antenna 1
Figure 2-6 Logical Architecture of Channel Unit
2.3.1 Function
The CHU processes and converts protocols for the physical layer and data link layer of the PDT air
interface. Physically it consists of channel board, TX board and RX board.
z CHB: be capable of signal processing, channel encoding/decoding, interleaver and de-interleaver,
modulation/demodulation, RF signal loop-back test and fail-soft.
z TXB: be capable of modulating, upward frequency conversion, filtering and D/A conversion from
carrier baseband signal to RF signal, as well as amplifying the downlink signal.
z RXB: be capable of filtering, demodulating, downward frequency conversion, AGC and A/D
conversion from three-path carrier signal to baseband signal, as well as amplifying the uplink signal.
2.3.2 Front Panel
The front panel of CHU is described as follows.