Hello everyone, in this video we're going to talk
about a wireless technology called MU-MIMO which stands for multi-user, multiple input, multiple
output. Now MU-MIMO was introduced with the wave 2 version of the 802.11ac wireless standard and this
is a feature that's used in modern wi-fi routers. And what this does is that it allows multiple
wireless devices to communicate with a wi-fi router at the same time. Now previously routers
communicated with devices using SU-MIMO which stands for single-user, multiple input, multiple
output. Now this was used with the previous wireless technology which was 802.11n. Now this
also allowed wi-fi routers to communicate with multiple devices but only with one device at a
time. So each device would have to wait their turn to communicate with the router. So as more devices
connected to the wi-fi router, congestion happens. Now this is not really a big deal if these
devices were just using low data applications such as browsing the internet. However if
they were using high data applications, such as streaming videos, then the result
would be a slow down in the internet speed which would cause lag and buffering. So basically
SU-MIMO works on a first come first serve basis. However a router that's using MU-MIMO all the
devices that are connected to it won't have to wait their turn because it allows communication
to multiple devices all at the same time. It breaks up the internet bandwidth and pushes it
to the connected devices. So with this technology you will see a significant improvement in the
speed of your internet especially if you're doing things that require a lot of bandwidth,
such as streaming videos or downloading. It reduces lag to the connected devices because
the connection is never interrupted, which increases performance. So it's almost as
if each device had their own separate wi-fi router. So if you have a lot of wireless devices
that demand a lot of bandwidth in your home and you're experiencing slow internet performance
or choppy video, you should be using a router with MU-MIMO technology. Now MU-MIMO also takes
advantage of beamforming. Now beamforming is a technique that sends transmissions in a
specific direction which strengthens a signal. But without beamforming, the transmission is sent
in every direction which can weaken the signal and this is what happens in older routers. But
with newer routers, the signal is directed to the devices that are connected to it. So basically
you can compare this technique to a flashlight versus a lantern. A lantern works without
beamforming, where light is spread out in every direction and not towards a specific device.
But a flashlight works similar to beamforming. where the light is specifically aimed at a
certain direction and targets specific devices. Now MU-MIMO routers come in different variations.
So for example, they may come in 2x2, 3x3, or 4x4 versions. And these variations refers to
the number of streams that are created. So a 2x2 device means that it has 2 antennas that are
used for 2 simultaneous streams. A 3x3 device means it has 3 antennas for 3 streams.
And a 4x4 device will have 4 streams. Now this doesn't mean that you can't add more devices.
So for example, on a 4x4 router if you add a fifth device, then that just means that a stream
will have to be divided and shared with another device. But with the new wi-fi 6 it will have even
more dedicated streams for your devices. So the more devices you add, the streams won't have to be
shared as much. In fact some newer wi-fi 6 routers can support 12 simultaneous streams, with 4 streams
on a 2.4 GHz band and 8 streams on the 5 GHz band. Now not all wi-fi routers will support MU-MIMO.
Because in order to have this technology, the router must support at least the 802.11ac wave
2 standard which is known as wi-fi 5. Because the previous versions, such as the 802.11a, b, g,
and n, do not support it. And the router must specifically state that it supports MU-MIMO. And
also the devices that connect to this technology must also support it, which most modern devices
today already do. And in addition they also need to be able to connect to the 5 GHz band
because MU-MIMO only works in 5 GHz in wi-fi 5. So older devices that can only connect to
the 2.4 GHz band will not be able to take advantage of MU-MIMO. And another thing
to remember is that MU-MIMO only affects the download link and not upload and it only
supports a limit of 4 simultaneous streams. However with the new 802.11ax standard,
which is known as wi-fi 6, it works both in 2.4 GHz and 5 GHz and it can
support 8 or more simultaneous streams and as I said before, with some of these newer
routers it can support 12 simultaneous streams. So thank you everyone for watching this
video and if you're interested in getting a MU-MIMO router, I'll put a link in the
description below and thank you for watching.
