R&S®SMU-K74 MIMO fading

2x2 MIMO with one R&S®SMU200A

The R&S®SMU200A vector signal generator can be equipped with two baseband generators and two fading simulator boards. The R&S®SMU-K74 option then enables four logical fading simulators that can be correlated by setting the parameters in the channel matrix within the generator. This means, for tests on MIMO systems up to 2x2, users only need one R&S®SMU200A vector signal generator.

Beyond 2x2 MIMO with two R&S®SMU200A

For MIMO systems with more than two TX or RX antennas (e.g. with 2×4 MIMO), the number of required channel simulators also increases. Since one channel each has to be simulated from each transmitting to each receiving antenna, the actual figure is obtained by multiplying the number of antennas at the transmitter end by the number of antennas at the receiver end — i.e. eight logical fading simulators for 2×4 MIMO. For such scenarios, users only need two R&S®SMU200A generators, which are connected as shown in the figure below. A 2x4 MIMO configuration is selected in both generators and for each instrument is defined which two output channels it shall generate. Each generator now calculates all the fading processes - the processes for the two other output channels are only used to determine the correlation.They will not be further evaluated. Here, a common reference clock is crucial to ensure that the generators remain in sync. Another requirement is a common external trigger which always makes sure that a common starting point for calculating the profiles is defined.

2x4 MIMO with two R&S®SMU200A

Of course, all other MIMO modes such as 1×3, 1×4, 2×3, 3×1, 4×1, 3×2 as well as 4×2 can also be set up in a similar way. This means that the R&S®SMU200A generator can be used for measurements on MIMO systems under any of these scenarios.

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