EMULATOR FOR TESTING
Next generation wireless systems are moving towards ever increasing data rates, higher spectral efficiency and
improved quality of service. This development
has largely been facilitated by advanced terminals with multiple antennas. However, the use
of multiple antennas not only opens up new opportunities, but also presents new testing challenges.
For multi-antenna devices, like cellular
phones in LTE and laptops utilizing WLAN,
WiMAX and LTE technologies, the traditional
approach of testing the antenna characteristics
and the signal processing performance separately does not assess the terminal performance
This is because the conductive testing does
not realistically take into account the antenna
effects of multi-antenna devices. Because a
multiple-input-multiple-output (MIMO) radio
channel is a combination of the antenna characteristics and the radio propagation conditions,
they need to be tested together in a controlled
environment by a MIMO Over-the-Air (OTA) test
system consisting of a radio channel emulator
and anechoic chamber.
MEETING THE CHALLENGE
That is the challenge and the solution has
been developed in the form of the EB Propsim F8
MIMO OTA emulator that utilizes the company’s
patented file-based emulation approach, which
is a pre-requisite to convert the geometry-based
stochastic channel models to MIMO OTA models.
The emulator enables evaluation of different mobile terminal designs in a fully repeatable
and realistic wireless network environment and
makes it possible to test all critical parts of the
mobile terminal design at once, including antennas, RF front-end and baseband processing.
This eliminates the need for cables and test connectors leaving the mobile device intact, which
provides more accurate results of how the device will perform in the real world.
Figure 1 shows the EB MIMO OTA test system in schematic form. The EB MIMO OTA test
system consists of a transmitter, EB Propsim
F8 MIMO OTA channel emulator, an anechoic