Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent 5990-9872EN English _ 2013-10-29 _ PDF 1.40 MB c20140530 [4]

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Keysight Technologies
Accelerate Development
of Next Generation
802.11ac Wireless LAN
Transmitters-Overview
                                                       Application Brief




    Achieve increased insight into chipsets and
    modules for enterprise wireless set top boxes,
    mobile computing, and medical devices with
    measurement solutions for R&D and design
    verification test (DVT) of 802.11ac transmitters
Abstract                                                                Application overview
Wireless video and wireless data networking are driving                 Design validation engineers must ensure their 802.11ac
demand for standards, such as 802.11ac, which enable higher             designs will perform well under a variety of conditions,
throughput. Design validation engineers must ensure their               validating that their devices meet performance requirements
802.11ac designs will perform well under the most demanding             even for the most challenging MIMO spatial multiplexing
modulation schemes, including MIMO spatial multiplexing                 modes. To validate MIMO transmitter performance, a multi-
configurations.                                                         channel signal analyzer can be used to demodulate the multi-
                                                                        stream waveforms and measure EVM and other physical
To validate MIMO transmitter performance, a multi-channel               layer parameters.
signal analyzer can be used to demodulate the multi-stream
waveforms and measure EVM and other physical layer param-               Design and validation of 802.11ac MIMO transmitters
eters. The Keysight Technologies, Inc. PXI signal analyzer              requires making EVM measurements of multi-channel MIMO
solutions enable MIMO 802.11ac R&D and test engineers                   spatial-multiplexing signals. A test solution should be able to
to validate their designs with a mixture of measurement                 make these measurements rapidly, and with a high degree of
accuracy, fast speed, flexibility and scalability in a small form       confidence. The higher-order modulation formats and wider
                                                                        bandwidths proposed in the 802.11ac standard require better
factor.
                                                                        EVM, and the test solution's residual EVM should be able to
                                                                        exceed these requirements and enable future modifications
For measurements you can trust, with a modular, scalable                to the designs as they evolve, from single- and dual-channel
design for easy upgradability, Keysight's PXI modular software          40 MHz to 3- and 4-channel 160 MHz MIMO designs.
and hardware solutions make 802.11ac validation easy.
                                                                        Many test solutions today do not support the wide band-
                                                                        widths or multi-channel capabilities required by 802.11ac
                                                                        designers. They may also lack a full-featured analysis pack-
                                                                        age that includes hardware control and standards-based
                                                                        802.11ac modulation quality measurements.




Introduction
                                                                        Figure 1. 4-channel M9391A PXIe vector signal analyzer configuration
Increased use of wireless video and high-speed wireless data
networking in homes and offices is driving higher throughput
standards. Several standards emerged that address these                 Solution
new use models, including 802.11ac, which builds upon the
high throughput (HT) capabilities of 802.11n to accomodate              Keysight addresses these requirements with the M9391A, a
these new "Very High Throughput (VHT)" uses.                            scalable PXI vector signal analyzer enabling up to 4 analysis
                                                                        channels in a single PXI chassis, 160 MHz bandwidth per
802.11ac operates in the 5 GHz 802.11a/n bands, and builds              channel, and fast transfer speeds over the PCIe backplane.
upon the high throughput enhancements of 802.11n with key               Keysight's trusted 89600 VSA software is used to make
advancements:                                                           standards-based 802.11ac physical layer measurements.

 

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