User's Manual

Mobile WiMAX Indoor RAS SPI-2210 System Description/Ed.07

Board

Name

Qtty.

(Sheet)

Function

MRU-2 Max. 9 Mobile WiMAX base station RF Unit-20 MHz

- RF upconversion/downconversion

- Low Noise Amplifier (LNA) function

- TDD switch to separate the Tx/Rx path

- MIMO (2Tx/2Rx) RF path

- RF high-power amplification

- Suppression of the spurious waves out-of-band

- 20W (10W x 2Carrier)/Sector/Carrier output from each of two Tx

antenna ports

- Support of 2Carrier/1Sector per MRU-2

- Filter part connected to an antenna

MRR Max. 2 Mobile WiMAX base station RF receiver

- Six dedicated Rx modules to support 4-branch Rx diversity

- Support of 2Carrier/3Sector per MRR

- Sharing of the mounted space with MRU-2 slot #6 and #7

- Optional

MCU Max. 3 Mobile WiMAX RF Combiner Unit

- One sheet of MCU per sector when several noncontiguous carriers

(two or three carriers) are supported

- Combining the MRU-2 output

- MCU-2 (2way) or MCU-3 (3way) is mounted as applicable

Mobile WiMAX base station RF Unit-20 MHz (MRU-2)

The MRU-2 is the integrated RF unit that transceiver, power amplifier, TDD switch and

filter in the existing RAS are integrated into a module and supports the contiguous

bandwidth of 20 MHz. In short, up to two carriers can be supported by the MRU-2 in the

contiguous 10 MHz carrier over the frequency domain.

In addition, the MRU-2 supports 2Rx/Tx

2Tx/2Rx RF path per MRU-2 for the support of

MIMO and transmits 20W(10W x 2carrier) RF power per Tx path.

There are 3 kinds of MRU-2 according to operating frequency and frequency bandwidth.

- MRU-2FH (FH block) : 2640.5MHz~2673.5MHz (33MHz)

- MRU-2LB (LBS) : 2496MHz~2596MHz (100MHz)

- MRU-2UB (UBS) : 2624MHz~2690MHz(66MHz)

As for the downlink signal, the MRU-2 combines the baseband signal received from the

MRA-S via the ‘Samsung Digital I/Q and OAM’ interface according to sectors/carriers and

then converts it into the analog RF signal through Digital to Analog Conversion (DAC).

This RF signal is transmitted to an antenna through the filter part via the power

amplification process.

As for the uplink signal, the frequency of the signal received through the filter part of the