QCS-AX: Multi-User MIMO
■This document describes the capabilities, configurations, set up of Multi−User MIMO traffic and performance gain calculation with QCS−AX family of chipsets.
◆HARDWARE REQUIREMENTS
■Following are the minimum hardware requirements to test MU−MIMO
●QCS−AX RDK
●Windows/Linux/Mac Host PC with multi−gigabit (2.5/5/10 Gbps) Ethernet endpoint to push data traffic
●At least two MU−MIMO capable devices
◆SOFTWARE REQUIREMENTS
●QTN acR6.4 release and onwards
●Chariot traffic generator or Iperf
◆SYSTEM OVERVIEW
■Multi−User MIMO (MU−MIMO) is a wireless technology that maximizes the capabilities of supported client devices with multiple−input and multiple−output antennas. It utilizes distinct array of antennas for transmitting data/traffic streams to several clients in a set group simultaneously. Previous wireless technology transmits to one user at a time, which is known as Single−User MIMO (SU−MIMO). Henceforth, with concurrent use of airtime, channel, and bandwidth to serve multiple clients, MU−MIMO technology increases the overall system capacity and improves spectral efficiency that is proportional to the number of clients and their respective MIMO capabilities.
■As more spatial streams and higher bandwidth have been introduced to the world of Wi−Fi™ devices, MIMO has been the leading technology in recent years for high performance in the given airtime. The number of antennas and supported spatial streams in the AP and STA play a key role in this case. When STA does not have the matching number antennas (or spatial streams) that the AP`s offering, the AP cannot show its full potential performance. Clients today, especially mobile devices with limited size and power consumption, are typically using one or two antennas while APs may support up to 8 antennas. In cases of the conventional MIMO technology, since each client is served independently, overall system capacity would remain the same but individual client performance starts to reduce as more clients are added and served by the AP. In an MU−MIMO enabled network however, the same clients can achieve higher performance due to simultaneous transmissions.
■MU−MIMO was introduced with 802.11ac (Wi−Fi 5) and it included support for downlink traffic (AP −> STAs) only. With 802.11ax (Wi−Fi 6), MU−MIMO will be supported in both downlink (AP−>STAs) and uplink (STAs−>AP) traffic scenarios. This document is currently centric on MU−MIMO for downlink traffic only.
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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March, 2021 |
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Rev. 0 |
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UM70034/D |
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1.5 MB |
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