Fujitsu 5GRUDB3 User Manual page 54

RU Hardware Feature
Functional Block Diagram
Table 14 (Cont.)
Description of Function Block
Function Block
DPDC#B
n70n66-RF
DUP
PS
TRX
LLB
·
Issue 1.1, May 2021
Release 1.0
Name
Digital Pre-Distortion
Central unit#B
n70n66-RF#A
n70n66-RF#B
Duplexer
Power Supply
Transmitter and Receiver
Lower Layer Baseband
Function
▪ DPDC#B has a Power Supply (PS) function for the RU. It has a
DPD and CFR control function for PA of n70n66-RF#B.
▪ A transmission RF signal from the RF-IC is amplified by a power
amplifier (PA) for each band.
▪ A received RF signal from a duplexer is amplified by a Low Noise
Amplifier (LNA).
▪ Transmission digital signal from TRX is converted into a
transmission RF signal after performing D/A conversion and
orthogonal modulation at RF-IC and Received RF signal from a
duplexer is demodulated and A/D converted, and the received
digital signal is an output to TRX.
▪ The RF signals of each frequency bands (n70, n66) are combined
and separated, and the frequency bands of the transmitted RF
signal and the received RF signal are passed and the out-of-band
components are removed.
▪ Provides necessary power voltage to the RU from a DC power
supply input (DC-36.0 V...–58.0 V).
▪ It has a high-speed data (baseband signals) interface of LLB. It
also has an interface with the Radio Frequency Integrated Circuit
(RFIC), to perform DPD and CFR processing of the transmission
signal and Digital Down Conversion (DDC) processing of the
received RF signal.
▪ IQ signals in Lower Layer Split (LLS) and monitoring signals are
transmitted between a higher NR system CU device and TRX by
an optical fiber according to an eCPRI format.
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