Peak Performance in Spatial Multiplexing Mode
R&S
®
AMS32-K31
23
User Manual 1175.6678.02 ─ 01
Fig. 3-1: Hardware setup for dual-antenna tests
After selection of the test setup, a previously loaded R&S "CMW500-LTE" driver appears
in the yellow information field below the communication tester symbol (click "Extras >
Device List..." to load or configure the driver). You may also have to load drivers for the
positioner and antennas and select the four signal paths (right-click the "dB" symbols and
select "Sensitivity Horizontal" and "Sensitivity Vertical") as shown above. The two cross-
polarized test antennas provide four different polarization combinations (H
–
H, H
–
V, V
–
H, V
–
V). To measure all these combinations in a fixed test setup ("polarization loop";
chapter 3.1.2.5, "Loop Settings"
, on page 26), the first RF output connector of the
R&S CMW500 must supply both vertical antenna connectors, the second RF output con-
nector both horizontal antenna connectors. An RF switch unit is required for this test
setup. Double-click the switch symbol, provide the required path information, and cali-
brate your test setup in order ensure equal path attenuations and equal power densities
of all antenna signals at the EUT location.
To define the RF connector and external attenuation settings at the communication tester,
left-click the R&S CMW500 device symbol and open the "Settings" tab of the device driver
configuration dialog. The settings are identical to the single-antenna test case; see
. Click "OK" to save your hardware setup, assigning an appropriate file name (e.g.
"OTA Measurements_Dual Antenna").
3.1.2 OTA Test Template
In the "OTA Auto Test Template" dialog, you can configure your MIMO OTA test and
store your settings to a template file which you may use repeatedly.
Configuration
