Peak Performance in Spatial Multiplexing Mode
R&S
®
AMS32-K31
21
User Manual 1175.6678.02 ─ 01
3 Peak Performance in Spatial Multiplexing
Mode
This test case fundamentally consists in generating a two-stream signal in spatial multi-
plexing mode, and transmitting these two streams simultaneously to the DUT through
two different test antennas moving independently to different positions. Spatial multi-
plexing mode means that the two streams are filled with different data so that the maxi-
mum data rate can be increased by a factor of two compared to SISO operation.
Each test antenna is a cross-polarized one (e.g. a quad-ridged horn), so it is possible to
feed each signal to any of the two polarizations of the test antenna. The purpose of this
dual-antenna test is to determine the performance of the UE when high data rates are
streamed under good channel conditions.
In addition to the sensitivity threshold levels at arbitrary angular positions, the dual-
antenna test case provides derived quantities such as the cumulative distribution function
(CDF), the average throughput, and the complementary cumulative distribution function
(CCDF) of the relative throughput results which serves as an overall figure of merit for
the EUT.
The following sections describe specific dual-antenna MIMO OTA configurations and
results.
3.1 Configuration
The configuration of a dual-antenna MIMO OTA setup involves the following steps:
1. In the "Sensitivity" tab of the "Hardware Setup" dialog, select the appropriate setup
"MIMO 2x2 with variable offset between test antennas". See
Configuration
