User's Manual

Ver.
CHAPTER 3. System Structure
2600-00FKQFGA2
1.0
Clock Generation and Distribution Function
The L7IA is equipped with Beyond Enhanced GPS Engine Module (BEGEM) and
IEEE1588v2 block. The BEGEM enables each block of the Indoor Pico Cell to operate
under a synchronized clock system.
The BEGEM creates the PP2S (Even Clock) and digital 10 MHz using the synchronization
signal received via the GPS antenna while the IEEE1588v2 block creates the 1 PPS and
digital 10 MHz synchronized with the IEEE1588v2 Master and each delivers the created
data to the Clock Generation & Distribution block of the L7IA.
The Clock Generation & Distribution block generates the system clock (30.72 MHz), PP2S
(Even clock), 1 PPS, and System Frame Number (SFN) for synchronization using the
signals received, and distributes them to the hardware blocks in the system.
The clock distributed in the system is used to keep the internal synchronization in the Pico
Cell and operate the system.
The Clock Generation & Distribution block also generates the 1PPS which is the reference
clock used for the measuring equipment or repeater. And, the BEGEM also transmits time
information and location information through the TOD path.
Network Interface Function
The L7IA interfaces with the EPC via Gigabit Ethernet or Fast Ethernet.
Subscriber Channel Processing Function
The L7IA is equipped with the modem supporting the LTE standard physical layer to
process the OFDMA/SC-FDMA channel, and the DSP processes the RLC/MAC.
The modem modulates the packet data received from upper level and transmits it to the
transceiver. Reversely, the modem demodulates the packet data received from the
transceiver, converts them to the format which is defined in the LTE standard physical
layer specifications, and transmits them to the upper processor.
2Tx/2Rx MIMO Support
The RF part of the L7IA consists of transceiver and AMP, and supports the RF path of the
2Tx/2Rx. The maximum output is 250 mW/path for the external antenna port of the
enclosure.
DAC/ADC and Power Amplification
For the downlink, the baseband signals are converted to analog signals through the Digital
to Analog Converter (DAC). The frequency of those analog signals is up converted through
the modulator and then those signals are amplified into high-power RF signals through the
power amplifier.
For the uplink, the frequency of the signals where low noise is amplified at LNA of L7IA is
down converted through the demodulator. These down-converted frequency signals are
converted to baseband signals through the Analog to Digital Converter (ADC).
The converted baseband signals are transmitted to the modem.
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