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.
An update to the R&S CMW270 wireless connectivity tester now allows developers to test the RF characteristics of both transmitters and receivers as well as determine the data throughput in the transmit and receive directions.
In signaling 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-signaling mode, tests and measurements in signaling 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.
Alongside the IEEE 802.11a/b/g/n/ac/ax WLAN standards, the CMW270 can also simultaneously test Bluetooth devices, and also supports RF tests for ZigBee and Thread components using the IEEE 802.15.4 standard.
The WLAN 2x2 MIMO 11ax signaling solution will be shown at Mobile World Congress 2019 in hall 6, booth 6C40 and will be available from April 2019 for the R&S CMW270, R&S CMW290 and R&S CMW500 radio communication testers.