Fig. 3.8 Epatrx And Esipro Function Block Diagram - Siemens BS-240 Technical Description

Technical Description (TED:BSS)
BS-240/241
Fig. 3.8 EPATRX and ESIPRO Function Block Diagram
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EDGE Power Amplifier and Tranceiver Unit ( EPATRX)
EPATRX provides the main analog functions of the CU. In uplink direction, two (diver-
sity) preamplified and filtered RF signals are received from the antenna combining
equipment. These signals are down converted to IF and channel filtered in the RXFE
stage. The IF signals are then transmitted to ESIPRO, where they are sampled and digi-
tally down converted to baseband. In downlink direction, the GMSK or 8PSK modulated
signal is received from the ESIPRO, I/Q modulated and up converted by the MODUP
stage, which also provides the levelling of the output power.
The obtained RF signal is then power amplified by the module EPWRST and transmitted
to the antenna combining equipment. A part of the transmitted power is fed to the
module PWRDET, which performs the power detection. This signal is used to close the
digital power loop.
The Predistortion Receiver (PDRX) down converts the transmit signal to the TX-IF for
the I/Q-Demodulation and adjusting the predistortion values. The transmitter is linear-
ized by means of an adaptive digital predistortion which is applied to the baseband
signals. For the introduction of the ECU,a static predistortion was choosen for lineariza-
tion of the transmit path. The HW is able to do adaptive predistortion, which can be
installed by SW update. EPATRX is able to support synthesizer frequency hopping by
the implementation of the synthesizer modules RXLO and TXLO. The unit test of the
Information
Base Station System
A30808-X3247-L14-2-7618