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Keysight Technologies
Measurement Solutions for
Multichannel Applications
Application Note
Abstract Application Overview
The ever-increasing demand for consumer devices that New requirements for multichannel applications require a
support wireless LAN (WLAN), including cell phones, wideband test solution capable of analyzing at least 3 to
tablets, and game consoles, is driving the need for the 4 BBIQ channels with highly accurate EVM performance.
rapid deployment of new wireless technologies such as Extending previous 2-channel test solutions to support
802.11ac. 802.11ac requirements for 160 MHz bandwidth testing
can be complex; therefore, the ability to create and
While 802.11ac will add signifi cant value to customers and analyze MIMO signals during the research and develop-
end-users, it brings with it new design and test challenges ment (R&D) test phase is an essential component of an
802.11ac test solution. As higher-order modulation of 256
for systems engineers such as much wider bandwidth
QAM necessitates the demand for better EVM perfor-
signals of 160 MHz, as well as the need for better error
mance (-32 dB), a test solution must also be capable
vector magnitude (EVM) performance to support 256 QAM.
of providing accurate EVM performance results. The
requirement for MIMO implies that test equipment must
Accelerate system simulation, design, and test for 802.11ac support up to 8 channels for the capture and generation
with Keysight Technologies, Inc. RF vector signal generator, of signals to and from the 802.11ac device. To test the
multichannel digitizer, and vector signal analysis (VSA) optional beamforming functions in the standard, the chan-
software that provide a complete BBIQ solution for mul- nels also need to be phase-coherent. As we look towards
tiuser, multiple-input, multiple-output (MU-MIMO) analysis. the future, test systems must be flexible enough to evolve
with WLAN test standards which may require support for
With approximately 500 million 802.11ac devices expected bandwidths up to 500 MHz.
to reach the market by 2015, device manufacturers require
a cost-effective and effi cient solution for wideband testing
of multichannel applications with accurate EVM analysis.
Solution
Introduction Keysight Technologies provides a complete, end-to-end
solution for multichannel measurements of 802.11ac BBIQ
802.11ac is backwards compatible with 802.11n digital simulation, design, and test.
communication techniques, while providing several new
key advances over prior Wi-Fi technology. Major feature Keysight's N5182B MXG, with Signal Studio software, is
enhancements of 802.11ac include: capable of generating 802.11ac waveforms with up to 160
MHz bandwidth, to simulate signals sent to the device
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