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Popular science: what is the new "MU-MIMO dynamic overclocking width" of Xiaomi ax3600 router?

via:驱动之家     time:2020/5/9 13:56:57     readed:92

And today, Xiaomi Router AX3600 made a second major update,One item was added, entitledThe user does not need to make a choice. The two modes can run at the same time.

Upgrade method: Enter Xiaomi Wi-Fi App- Toolbox - Upgrade Assistant to check for updates and upgrades


At present, the mainstream Wi Fi 6 router supports 160MHz but can only realize 2 * 2. It can't make the 3 * 3 macbook pro and 4 * 4 high-end network card run at full speed. There are also more than 4 * 4 routers that only support 80MHz. When using this kind of products, if you have a mobile phone / computer that supports 160MHz and a laptop that supports 3 * 3 MIMO, there will always be one that cannot achieve the theoretical maximum speed.

Its principle is well understood. The ax3600 has 4-way 5GHz antennas. We have achieved the effect of 2 * 2160mhz by combining 2-way 80MHz bandwidth. The device supporting 160MHz can get large throughput of 160MHz bandwidth, and other devices can use 4 * 480mhz at the same time to get better coverage.

At this point, a friend who has some knowledge of router parameters should have understood what this function means. Maybe many friends don't know MU-MIMO, and the difference between 2 * 2 and 4 * 4, 160MHz and 80MHz parameters. Let me give you a general introduction.


What is 4 * 4 MU-MIMO? What's the use of it?

Before we know what MU-MIMO is, let's take a look at MIMO.Every device that supports Wi Fi has an antenna, each antenna can generally receive (input) and send (output), and the device with multiple antennas also supports MIMO (multi input multi output).

Generally, there is only one transceiver antenna for low-end entry-level mobile phones and IOT devices, and there will be two antennas for mainstream flagship mobile phones, while there will be three antennas for flagship laptops such as MacBook Pro. The number of antennas also determines the maximum network throughput at this end of the device.

To this end of the router, if a router has two antennas to support 5 G Wi-Fi, then we generally say it supports 2*2 MIMO, and so on, three antennas is 3*3 MIMO,4 the antenna is 4*4 MIMO.

and the more the number of MIMO, the larger the network throughput. You can think of MIMO as a lane, n*n MIMO can simply be understood as n lane, and the load (throughput) on n lane is n times the load on a single lane. The Wi-Fi 6, for example, has a single lane (antenna) rate of about 600 Mbps. in the 80 band So 2*2 is about 1200 Mbps,3*3 about 1800 Mbps.

But in fact, Wi Fi speed depends on the lowest of routers and terminal devices (mobile phones, laptops, IOT devices, etc.). If the router has only two 5GHz antennas and the device has three antennas, it can only support 2 * 2 MIMO at most. If the router has four 5GHz antennas, the equipment of both two or three antennas can support the theoretical maximum.

The actual application scenario is as follows:

a. A 5GHz 2 * 2 Wi Fi 5 router and a 5GHz 1 * 1 Wi Fi 5 mobile phone can achieve the maximum speed of 433mbps

b. A 5GHz 4 * 4 Wi Fi 6 router and a 5GHz 2 * 2 Wi Fi 6 mobile phone can achieve a maximum speed of approximately 2 * 600mbps = 1200mbps

c. A 5GHz 4 * 4 Wi Fi 6 router and a 5GHz 3 * 3 Wi Fi 5 computer can communicate, so the maximum speed it can achieve is approximately 3 * 433mbps = 1300mbps

d. A Wi Fi 5 Router Supporting 5GHz 4 * 4 and a Wi Fi 6 mobile phone supporting 5GHz 2 * 2 can achieve a maximum speed of approximately 2 * 433mbps = 867mbps

Of course, this is the theoretical value within the local area network. If you connect to an external network, it will be affected by the network bandwidth and the type of network cable. But it's not hard to find,In the same configuration, the 4 * 4 router is more practical, and the maximum speed supported by wi-fi6 is higher than that of wi-fi5!

Having said MIMO, let's talk about MU-MIMO. When multiple devices use router network, they are not connected at the same time, but waiting in line. MU-MIMO has changed the team from one to multiple, allowing multiple devices to access at the same time without waiting.

The principle of MU-MIMO (multi-user multiple input multiple output) is to provide services for multiple terminal devices at the same time through reasonable deployment of antennas and phase superposition of waveforms sent out by antennas.MU-MIMO technology can significantly increase throughput and reduce network congestion and delay in the case of multi device access. In addition, the coverage of 4 * 4 signal is also increased by about 30% compared with 2 * 2.


What's the difference between 80MHz and 160MHz?

We know that 160MHz is the largest bandwidth of Wi Fi at present. Although it has unprecedented large throughput, it also has weaknesses, such as small signal coverage and easy attenuation.At present, 160MHz has been applied to some mobile phones, flagship laptops and other devices, but many routers supporting 160MHz only support 2 * 2, and the coverage effect is not good.


Xiaomi Router AX3600 pass

Let's give you another example, assuming your home

1.iPhone 11;2*2 80MHz, equipment theory

2.Macbook Pro;3*3 80MHz, equipment theory


If you do

1.iPhone 11,

2.Macbook Pro,


As you can see,Before and after OTA upgrade, the biggest change is the device supporting 160MHz, and the theoretical maximum speed can be doubled directly.At this point, you can see


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