[OPLIN 4cast] OPLIN 4cast #496: MU-MIMO

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OPLIN 4cast #496: MU-MIMO
June 29th, 2016

[image: MU-MIMO router] That’s so much more fun to say than “Multi-User,
Multiple-Input, Multiple-Output.” MU-MIMO is wireless technology that
allows a single wireless router to send internet data streams to multiple
devices simultaneously. That last word — “simultaneously” — is important.
Most current wireless routers only communicate with one device at a time,
though they switch from device to device so quickly the interruptions are
not noticeable. At least not noticeable until you start sending streaming
media to multiple devices. That’s when it could be nice to have MU-MIMO —
maybe.
- What is MU-MIMO? <http://www.digitaltrends.com/computing/what-is-mu-mimo/>
(Digital Trends | Tyler Lacoma)  “Much like how film tape looks like a
constantly moving image instead of a bunch of stills, accessing Wi-Fi feels
like a constant connection to the Internet because the router switches
between devices so quickly. However, it can only pay attention to one
device at one time, which is one reason why Internet quality goes down if
Wi-Fi bandwidth is too low. This works. It works so well that we rarely
think about it. But the people who *do* think about it have long believed
that it could work better. What if you could have a router that transmits
data to multiple devices simultaneously?”
- How does MU-MIMO work?
<http://www.networkcomputing.com/wireless-infrastructure/how-does-mu-mimo-work/748964231>
(Network Computing | Jason Hintersteiner)  “MU-MIMO takes this [transmit
beamforming] process one step further. By adding even more radio
chains/antennas, it can control the phased antenna pattern to control both
the areas of maximum constructive interference — where the signal is the
strongest — and maximum destructive interference — where the signal is the
weakest. With a sufficient number of antennas and knowledge about the
relative positions of all associated client devices, it can actually create
a phased pattern to talk to multiple clients both independently and
simultaneously.”
- How will MU-MIMO improve 802.11ac Wi-Fi?
<http://www.rcrwireless.com/20160501/network-infrastructure/will-mu-mimo-improve-802-11ac-tag6-tag99>
(RCR Wireless News | Kelly Hill)  “One of the drawbacks that MU-MIMO faces,
however, is device support. Although there has been notable progress on
MU-MIMO chipset support and in router deployments
<http://www.quantenna.com/pressrelease-01_06_16.html> over the past 12-18
months, SRG [Signals Research Group] noted that ‘we’ve noticed that a
rather large percentage of smartphones do not have a 2×2 Wi-Fi antenna
configuration’ — that while MIMO’s use in HSPA+ and LTE cellular phones is
nearly ubiquitous, the same is not true for Wi-Fi.”
- What is MU-MIMO, and do I need it on my router?
<http://www.howtogeek.com/242793/what-is-mu-mimo-and-do-i-need-it-on-my-router/>
(How-To Geek | Chris Stobing)  “Last, there’s the fact that MU-MIMO
broadcast signals work on a directional basis, and can only be split up
when devices are in different locations around the house. For example: if
you’re streaming a movie to the living room on the TV and your kids are
connecting their Nintendo 3DS on the couch only a few feet away, by default
both devices will be forced to share the same stream.”

*Articles from Ohio Web Library <http://ohioweblibrary.org>:*

   - MU-MIMO system concepts and implementation aspects.
   <http://search.ebscohost.com.proxy.oplin.org/login.aspx?direct=true&db=buh&AN=95705806>
   (*Intel Technology Journal*, 2014, p.92-105 | Biljana Badic, Rajarajan
   Balraj, Ingmar Groh and Peter Fazekas)
   - Secrecy outage analysis of MU-MIMO transmit antenna selection systems
   with arbitrary number of eavesdropping users.
   <http://search.ebscohost.com.proxy.oplin.org/login.aspx?direct=true&db=aph&AN=102817647>
   (*Electronics Letters*, 5/28/2015, p.874-876 | Yujia Hu and Xiaofeng Tao)
   - Solving hidden terminal problem in MU-MIMO WLANs with fairness and
   throughput-aware precoding and a degrees-of-freedom-based MAC design.
   <http://search.ebscohost.com.proxy.oplin.org/login.aspx?direct=true&db=aph&AN=114713540>
   (*EURASIP Journal on Wireless Communications & Networking*, 4/22/2016,
   p.1-25 | Sanjeeb Shrestha, Gengfa Fang, Eryk Dutkiewicz and Xiaojing Huang)

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