The R&S®FSQ-K94 option for theR&S®FSQ or R&S®FSG
high‑end signal and spectrum analyzers expands the
R&S®FSQ-K93 application firmware to support MIMO measurements. The objective of MIMO (multiple input multiple
output) is to increase the data rate in wireless communications systems such as WiMAX™. The different modes, defined in the IEEE 802.16e‑2005 standard, are supported by the R&S®FSQ-K94 application firmware:
-
TX diversity (matrix A)
-
Spatial multiplexing (matrix B)
The R&S®FSQ-K94 option in combination with the
R&S®FSQ or R&S®FSG high‑end signal and spectrum
analyzers offers a flexible and scalable solution for TX
measurements.
Most applications do not require that both antennas be
measured at the same time. Therefore, only one analyzer is
needed in order to measure antenna 0 or antenna 1, which
can easily be done with R&S®FSQ-K94 installed on the
R&S®FSQ or R&S®FSG.
When matrix A is used, the same information is sent on
both antennas with different coding (Alamouti coding).
TX measurements of both antennas at the same time,
if needed, can also be performed by using only one
R&S®FSQ or R&S®FSG. With matrix B, both antennas
transmit different data streams, which doubles the data
rate. For full characterization of the RF transmission, it is
necessary to receive both transmit paths simultaneously.
For this purpose, two analyzers are needed, one acting as the master and the other one as the slave. The application firmware is required on the master only. This mode is currently implemented.
Using the R&S®FSQ-K94 option, all the features, that are
familiar from the R&S®FSQ-K93 WiMAX™ application firmware are supported such as user‑editable SEM or autodemodulation, and users get the same results. In addition, the different channels can be displayed, and additional MIMO‑related results such as power of unmodulated pilots are listed.
