User's Manual

Uniwave System Overview

User Manual

1.3.4 Support for MIMO Services

The next generation of high data-rate services such as LTE provide various multiple-input and multiple-

output (MIMO) options. Where base stations (BTS) are deployed to provide in-building coverage, these

options can be used to increase the overall capacity or coverage of the system.

Typically, BTS signals are distributed inside buildings via a Distributed Antenna System (DAS) which

has multiple antenna locations to provide multiple copies of each signal. In the case of MIMO, each

antenna location will require 2 or more independent signals from the same BTS. The standard Uniwave

single star and double star architectures support a traditional single signal (SISO) BTS. See “Single

Star Configuration” and “Double Star Configuration” .

In the case of a single star topology, 8 Remotes would have 16 antennas. For double star at a capacity

of 8 Secondary Hubs, each with 8 Remote Units, you could have 64 Remotes Units with a total of 128

antennas at 64 antenna locations. Each location has 1 Rx and 1 Tx antenna. This architecture has to

change to support a dual-transceiver MIMO BTS.

In a full MIMO double star configuration, there would be 1 Primary Hub and 8 Secondary Hubs. Of

these, 4 would be carrying MIMO A and 4 MIMO B. Each Secondary Hub still connects to 8 Remote

Units: however, now 32 of those units have MIMO A and the other 32 MIMO B.

If the MIMO installation still uses SISO antennas, the number of antennas remain the same at 128, 64