Multiple input multiple output (MIMO) is a multi-antenna method that uses multipath propagation to boost data rates in wireless communications. The transmit and receive antennas must be spatially separated from each other. The compact design of mobile devices such as smartphones is a limiting factor. These devices can hold at most two transmit and two receive antennas, which limits transmission to 2x2 MIMO.
Rohde & Schwarz is unveiling a test solution at Mobile World Congress for WLAN 2x2 MIMO stations in line with the IEEE 802.11ax standard. Using the R&S CMW270 wireless connectivity tester, developers can test the RF characteristics of both transmitters and receivers. This solution also allows them to determine the data throughput in the transmit and receive directions.
In signalling mode, the R&S CMW270 emulates a WLAN 11ax access point (AP) to which the DUT, a WLAN station, is connected in normal mode. Unlike commonly used non-signalling mode, R&S says tests and measurements in signalling mode have the advantage that the user performs them under realistic conditions and does not need wired remote control with device-specific control software for the DUT.
The R&S CMW270 can also simultaneously test Bluetooth devices and supports RF tests for ZigBee and Thread components in line with IEEE 802.15.4.
The WLAN 2x2 MIMO 11ax signalling solution will be available in April 2019 and can be ordered for the R&S CMW270, R&S CMW290 and R&S CMW500 radio communication testers.