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>> Download 5991-2637EN Enhancing Measurement Performance for the Testing of Wideband MIMO Signals - White Paper c20140815 [14] documenatation <<

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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:

                                          

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