Siemens RUGGEDCOM WiN5100, Руководство пользователя, Страница: 15 / 114

RUGGEDCOM WiN5100/WiN5200
User Guide
Chapter 2
Product Description
Features 7
Section 2.3
Features
Section 2.3.1
Mobile WiMAX Wave 2 MIMO Features
Multiple-Input, Multiple-Output (MIMO) describes systems that use more than one radio and antenna system
at each end of the wireless link. In the past it was too costly to incorporate multiple antennas and radios in a
subscriber terminal. Recent advances in radio miniaturization and integration technology now make it feasible
and cost effective. Combining two or more received signals has the immediate benefit of improving received
signal strength, but MIMO also enables transmission of parallel data streams for greater throughput. For
example, in a 2 × 2 MIMO (two transmit and two receive elements), dual polarization point-to-point system, the
carrier’s allocated frequency can be used twice, effectively doubling the throughput data rate.
In point-to-multipoint systems employing MIMO, each base station antenna transmits a different data stream
and each subscriber terminal receives various components of the transmitted signals with each of its subscriber
antennas. The subscriber terminal is able to algorithmically separate and decode the parallel simultaneously
received data streams.