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Keysight Technologies
Enhancing Measurement Performance for
the Testing of Wideband MIMO Signals
White Paper
How to generate and apply magnitude
and phase corrections for multichannel
baseband IQ measurements when using
the Keysight M9703A AXIe digitizer
Table of Contents Introduction .............................................................................................. 3
Applications .............................................................................................. 4
Magnitude and Phase Correction for Multichannel
BBIQ Measurements ............................................................................... 5
1. Measurement Methodology ........................................................ 5
2. Hardware Configuration ............................................................... 8
3. Signal Generation and Acquisition ............................................. 9
4. Generation of User Correction Filters in
89600 VSA Software ................................................................... 10
5. Demonstration Example to Test Results of Correction ........ 12
Summary ................................................................................................. 13
About the Author ................................................................................... 13
Keysight Advantage Services .............................................................. 14
Contact Keysight .................................................................................... 14
Introduction Testing the baseband modulation of 802.11ac MIMO signals introduces new challenges for
systems engineers, such as the increased modulation bandwidth of up to 160 MHz, the support
for up to eight MIMO spatial streams, and the increased requirement in EVM performance to
support 256 QAM. Multichannel applications such as these require a wideband test solution
capable of analyzing multiple IQ channels with highly accurate cross-channel performance.
Extending 2-channel test solutions to support Multi-User MIMO (MU-MIMO) 802.11ac
requirements for 160 MHz bandwidth testing can be complex, and the variation in frequency
response, magnitude and phase, between channels can greatly impact measurement
performance.
This white paper describes a simple method for the characterization and correction of channel
frequency response in the Keysight Technologies, Inc. 89600 VSA software environment for
baseband IQ (BBIQ) measurements over large bandwidths. This document describes the
measurement methodology, the hardware configuration, and the application of user correction
filters to improve demodulation performance results using 802.11ac signals. In this paper,
802.11ac BBIQ simulation and test are enabled through use of the following Keysight products: