Atec Spirent-SR5500 - Manual (Page 5)

SR5500 Wireless Channel Emulator
SPIreNT wIreLeSS ChANNeL emuLATOr
SCm/SCme COrreLATION mATrIX GeNerATOr
The included SCM/SCME Correlation Matrix Generator lets you
create customized spatial channel models in minutes. You enter
a few key parameters such as antenna spacing, angles of arrival/
departure and angular spreads, and it generates correlation
matrices that can be plugged directly into the SR5500’s software.
DYNAmIC SCm/SCme
The SR5500 is ready to meet the demands of time-evolving
spatial channel models such as those imposed by the WINNER II
interim channel models specification.
In order to more realistically test receivers using spatial channel
models, the industry has developed a series of channel modeling
scenarios that emulate the evolution of a connection session
over time. One scenario, called “drop modeling”, is implemented
in the SCM. In drop modeling the RF channel behaves as if the
receiver suddenly “dropped” from one physical location and re-
appeared in another. These models don’t entirely reflect the more
accurate scenario and its effect on small-scale parameters such
as delays and angles-of-departure. The SR5500 can, of course,
implement this required yet artificial approach.
In the interest of better testing, some advanced groups such as
WINNER have proposed the execution of “time-evolving” channel
modeling. A much more accurate approach, its use has been
limited by the abilities of many channel emulators. Of course,
with the SR5500’s DEE, none of this is a problem. The SR5500
easily and automatically handles the required smooth transitions
that stump other emulators.
In fact, the SR5500 is also unique in that both drop models and
time-evolving models can be customized. With DEE, you are not
stuck with whatever time-based scenario someone else thought
was important.
The SR5500 easily generates drop models (top) and time-
evolving models (bottom).
Dynamic motion can cause unique momentary RF conditions.
Find out if your design is up to it… before deployment.
MME
PGW
SGW