WRFU
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WRFU One WCDMA radio frequency unit (WRFU) supports 40 W (2 carriers) and 80 W (4 carriers) power outputs.
Panel Figure 1 shows the panel of the WRFU. Figure 1 Panel of the WRFU
Function The direct frequency conversion technique, which is directly implemented in the transmit channel, modulates the baseband signals to WCDMA RF signals. After being filtered and amplified, the RF signals are transmitted to the antenna for transmission through the duplex filter. The uplink RF signals received from the antenna go through down-conversion, amplification, analog-to-digital conversion, digital down-conversion, matched filtering, automatic gain control (AGC). Then, they are sent to the BBU for further processing. Power control and Voltage Standing Wave Ratio (VSWR) detection Reverse power detection Frequency synthesis and loopback test Generation of the CPRI clock, recovery of the CPRI clock of lost synchronization, and alarm detection The WRFU supports 40 W (2 carriers) and 80 W (4 carriers) power outputs.
Principle
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WRFU
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The WRFU consists of the high-speed interface unit, signal processing unit, power amplifier, and duplex unit. Figure 2 shows the principle of the WRFU module. Figure 2 Principle of the WRFU
The functions of the high-speed interface unit are as follows: Transmitting the signals received from the BBU to the signal processing unit Transmitting the signals received from the signal processing unit to the BBU The signal processing unit consists of two uplink RX channels and one downlink TX channel. The functions of the uplink RX channels are as follows: Performing down-conversion of the RF signals to IF signals Amplifying the IF signals and performing IQ demodulation Converting analog signals to digital signals Sampling digital signals Performing matched filtering AGC Encapsulating data The functions of the downlink TX channel are as follows: Decapsulating the clock signals, control signals, and data signals from the BBU and sending them to associated units Shaping and filtering downlink signals Converting digital signals to analog signals and modulating IQ Performing up-conversion of IF signals to the transmit band The power amplifier amplifies the low-power RF signals from the signal processing unit. The functions of the duplexer are as follows: Multiplexing the RX signals and TX signals Enabling RX signals and TX signals to share one antenna channel Filtering the RX/TX signals
LED Table 1 describes the LEDs on the panel of the WRFU.
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WRFU
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Table 1 LEDs on the WRFU Identity
Status
Description
RUN
ON steady
The power input is normal, but the module is faulty.
OFF steady
There is no power input, or the module is faulty.
1s ON, 1s OFF
The module is running properly.
0.125s ON, 0.125s OFF
The module is loading software or is not started.
ON steady
The module is in the alarm status.
OFF steady
No alarm is generated.
ON steady
The module is functional and is connected to the BBU.
OFF steady
The module is not connected to the BBU.
1s ON, 1s OFF
The module is in the local test status.
Off (red)
No VSWR alarm is generated.
On (red)
A VSWR alarm is generated.
On (green)
The CPRI link is normal.
On (red)
The interface module fails to receive signals.
1 s ON, 1 s OFF (red)
The CPRI link is out of lock.
On (green)
The CPRI link is normal.
On (red)
The interface module fails to receive signals.
1 s ON, 1 s OFF (red)
The CPRI link is out of lock.
ALM
ACT
VSWR
CPRI0
CPRI1
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WRFU
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Identity
Status
Description
Port Table 2 describes the ports on the panel of the WRFU. Table 2 Ports on the panel of the WRFU Connector
Label
Connector Type
Description
Port for transceiving RF signals
ANT_RXB
DIN
Connecting the antenna subsystem
ANT_TX/RXA
DIN
CPRI0
SFP female connector
Connecting the BBU, or the upper-level WRFU during the cascading
CPRI1
SFP female connector
Connecting the lower-level WRFU during the cascading
QMA female connector
Input port of diversity signals in the antenna channel
RX_OUTA
QMA female connector
Output port of diversity signals in the antenna channel
Socket for power supply
PWR
2V2 power connector Introducing power
Commissioning port
MON
RJ45
CPRI
Interconnection port for RX_INB RF receive signals
Used for commissioning
Parent topic: Components in the RF Cabinet
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