Agilent 5991-2637EN Enhancing Measurement Performance for the Testing of Wideband MIMO Signals - White Paper free download

File name 5991-2637EN Enhancing Measurement Performance for the Testing of Wideband MIMO Signals - White Paper

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 p