Figure 4-34
Panel of the DRFU of 1800 MHz
NOTE
The DRFU of 1800 MHz is supported by V300R009 and later versions.
Functions
The DRFU performs modulation and demodulation of baseband and RF signals, processes data,
combines and divides the signals.
Both the DRFU of 900 MHz and DRFU of 1800 MHz perform the following functions:
l
Adopts the direct frequency conversion technology, modulates the baseband signals to the
GSM TX band. After filtering and amplification, the baseband signals are transmitted to
the antenna system through the duplex filter.
l
Receives uplink RF signals from the antenna system and then down-converts the received
signals to IF signals. After amplification, analog-to-digital conversion, digital down-
conversion, matched filtering, automatic gain control (AGC), the IF signals are sent to the
BBU for further processing.
l
Performs power control.
BTS3900
Hardware Description
4 BTS3900 Components
Issue 04 (2011-02-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4-45