20 | Keysight | Measurement Applications for the E6640A EXM Wireless Test Set - Solution Brochure

True MIMO

EXM offers True MIMO measurements for design and validation of multiple antenna

performance. EXM’s four independent TRXs make it easy to set up and quickly obtain

MIMO measurement results using trusted X-Series measurement science. EXM’s precise

time alignment across each TRX channel and high port-to-port isolation ensures

accurate MIMO measurement results. Each antenna in the DUT is connected to a

separate analyzer/source in the tester. EXM provides:

– Multiple TRX for simultaneous test of all MIMO channels

– Provides full set of MIMO metrics quickly; each channel is captured in parallel

– Design and validate 802.11n and 802.11ac up to 4x4 MIMO devices

– Multiple TRXs enable simultaneous test for up to 4x4 MIMO channels

– Supports 802.11ac 20/40/80/160/80+80 MHz

– Supports both Tx and Rx test for MIMO devices

– Detailed measurement results per channel: EVM, power, SEM, cross talk, frequency

response, etc.

Switched MIMO

In contrast to True MIMO, Switched MIMO provides a much lower cost method for

obtaining a full set of MIMO performance metrics using just a single EXM TRX channel.

With any space time block code (STBC) and scrambling turned off, the EXM’s built-in

fast switching RFIO switches the DUT antennas in turn to the analyzer and captures

data sequentially from successive signal bursts. Keysight measurements reconstruct

the multiple MIMO streams and perform measurements. EXM’s quad-core processor

maximizes production throughput by bringing the speed penalty associated with

sequentially capturing data from the MIMO streams down to a barely perceptible level.

EXM provides:

– Cost-effective solution to test MIMO performance

– Built-in fast switching RFIO switches the DUT antennae in turn to the analyzer

– Sequential capture from successive bursts

– Detailed measurement results per stream and channel: RMS EVM, peak EVM, pilot

EVM, data EVM, IQ offset, frequency error, etc.

– 802.11ac 20/40/80/160 MHz support

Figure 13. An EXM configured

with four TRX for testing 4X4

True MIMO