User's Manual

- 15 -
User’s manual_v01
1.3 System RF block diagram
Following diagram shows simplified RF block of PSR.
FPGA
DTU
RRFU
DL700
RRFU
DL800
RRFU
UL
DL700 PA
DL800 PA
UL PA
DONOR
MUX
SERVICE
MUX
DONOR
ANT
SERVICE
ANT
Figure 1 - 3 System RF block diagram
For the downlink, received RF signal from BTS to DONOR antenna port is converted to IF signal at RRFU, and
goes to FPGA for digital signal processing. The signals from FPGA is converted again so that the frequency of
the output signal is exactly the same with the original ones. Finally the signal is amplified & transmitted to
service area.
Uplink works the similar way but with the opposite direction when it comes to the signal flow. Received RF
signal from mobile to SERVICE antenna port is converted to IF signal at RRFU, and goes to FPGA for digital
signal processing. The signals from FPGA is converted again so that the frequency of the output signal is exactly
the same with the original ones. Finally the signal is amplified & transmitted to the BTS.