Product Description

General function, construction and units
DN991444 © Nokia Corporation Draft 45 (98)
Issue 3-0 en Draft Nokia Proprietary and Confidential
In the uplink direction, the signal from the MS is picked up by the antennas and
then passes through the duplex filter to the RX part of the transceiver unit. In the
RX part, the signal is converted to the intermediate frequencies (IF) and filtered.
The baseband module performs the digital signal processing and sends the signal
via the D-bus to the transmission unit. The transmission unit connects the BTS via
the Abis interface to the BSC. The Abis interface can be either a cable or radio
link.
In the downlink direction, the signal from the network is submitted via the
transmission unit and D-bus to the baseband module for digital signal processing.
The transmitter part of the transceiver unit receives the modulated baseband
signal from the baseband module, filters the signal to sufficient output spectrum
purity, and raises it to the carrier frequency. The signal goes through the duplex
filter to the antenna; and the antenna sends the signal via the Air interface to the
receiving MS.
6.1.2 Nokia MetroSite EDGE Base Station internal function
A block diagram of the Nokia MetroSite EDGE Base Station is shown in Figure
13.