User Manual

ArchitectureNortel Networks Confidential 3–59
S8000/S8002/S8006 BTS Reference Manual
3.5.3.2 Radio unit (e–RDRX)
The radio unit (see Figure 3–17) processes the radio channels for
transmission/reception function.
TX radio function
The transmitter module contains the transmission channels of lower power which
manage the Radio Frequency (RF) signals and Intermediate Frequency (IF) signals
as follows:
I/Q modulation
IF filtering and amplification
IF and RF transposition
RF band filtering
amplification and variable attenuation
output power control
RX radio function
The reception module includes the reception radio channels which manage the RF
and the IF signals as follows:
RF signals from LNA–splitter
RF to IF transposition
IF channel filtering and amplification
RF to BF transposition
Analog–to–digital conversion