User's Manual

CHAPTER 3. SPI-2213 Architecture

3-8

RRH Description

The RRH is a RF module of the SPI-2213, and supports sending/receiving RF paths.

RRH of this system is as follows:

Category EA Capacity RF Path Antenna Output

RRH-2 Max. 3 2Carrier/1Sector

(Contiguous 2Carriers)

MIMO (2Tx/2Rx) Outputs 4W/Sector/Carrier at 2

antenna ports each

The RRH is an RRH that integrates the RAS transceiver, power amplifier, TDD switch, and

filters in a single module.

In the case of downlink signals, the RRH converts baseband signals received through the

‘Digital I/Q and C & M’ interface from the MRA-F into Optic to Electrical (O/E).

The converted signals undergo Digital to Analog Conversion (DAC) to be converted to

analog RF signals, and then are amplified through the current amplification process.

Amplified signals are sent to the antenna via the filter part.

In the case of uplink signals, the frequency of the signals received through the RRH filter

part is lowered by Low Noise Amplifier (LNA). The Analog to Digital Conversion (ADC)

process converts these signals to baseband signals. The baseband signals are in the ‘Digital

I/Q and C & M’ format, and undergo E/O conversion to be sent to the MRA-F.