小米AX3600 MU-MIMO测试

Test the MU-MIMO with Xiaomi AX3600 and two Xiaomi AX1800

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Xiaomi AX3600 and Xiaomi AX1800 are both full high-pass solutions, Xiaomi AX3600 supports 4x4mimo at 80MHz bandwidth, Xiaomi AX1800 is 2x2mimo, both support 802.11ax, or WI-FI as defined by the WI-FI Alliance6. This article only tests 5G downlink MU-MIMO in 802.11ax mode If it works, then test the uplink and 2.4G uplink and downlink MU-MIMO.

Three wireless routers together.

小米AX3600 MU-MIMO测试

I wonder if MU-MIMO as we understand it is like this.

小米AX3600 mu-mimo

There are many friends think that 4 antennas will be divided into 2 groups of 2 × 2 to two receiving devices, which is a wrong understanding of MU-MIMO. and in the same space there are two groups of 2 × 2 occupy the 80MHz bandwidth, the highest speed will not exceed the wireless speed of a single 2 × 2, that is, no L with. So the correct understanding is as follows.

mu-mimo user

Through a complex algorithm, several wireless beams are sent to several receiving devices at the same time, and the receiving devices only receive the beams that belong to them, so MU-MIMO requires the receiving devices to support it as well. This is when the wireless router (wireless AP) transmits several different beams that only take up one 80MHz. so the total wireless throughput rate of MU-MIMO is greater than a single unit.

Not that the 4 × 4 wireless router can only support two 2 × 2 receiving devices, can be three, four, five, when the more the number, its “gain” the lower.

The test began, Xiaomi AX3600 do the main route, two Xiaomi AX1800 with wireless relay main route 5G, while the three routers are turned on MU-MIMO option, Xiaomi AX1800 wireless relay after the default is the switch MU-MIMO.

小米AX3600 MU-MIMO 04

Xiaomi AX3600 firmware version 1.0.67

Xiaomi AX1800 firmware version 1.0.336

After successful wireless relay, the relay quality is “poor” ???? Why, but after I reboot the relay quality is “excellent”.

小米AX3600 MU-MIMO 03

Before testing MU-MIMO, do a test on Xiaomi AX3600 to avoid affecting the test results due to bottlenecks. Because all gigabit port, if MU-MIMO is effective, take the worst 1.3 times to count, a single throughput rate is assumed to be 850Mbps, then a gigabit port will become a bottleneck, so you need to use 2 LAN ports, respectively, to two AX1800 transmission data. So now we have to test whether the wireless speed of 2 LAN ports to 5G can reach the broken gigabit.

In order to save a computer boot, I used a dual-port I350-AM2 installed network card, connected to the AX3600’s two LAN ports, another computer equipped with a wireless card AX200, AX3600 set 44 channels open 160Mhz bandwidth, when the maximum rate of AX200 is 2.4Gbps. each device connection schematic and random measurement also results are as follows: ( Test wireless speed with IXChariot)

AX3600 mu-mimo 01

IxChariot measured the speed three times randomly and took out the maximum value of 1285Mbps, proving that the switch chip to 5G wireless can suddenly gigabit. the results of IxChariot measurement are as follows.

小米AX3600 2个lan to AX200

However, I think this value is on the low side, there should be more than 1500Mbps to normal ah, because of the rush, did not toss this test.

In order to ensure that it is 4x4mimo, the next AX3600 set back to 80MHz bandwidth, and then use two computers were connected to two AX1800 LAN port, each device connection schematic and test results are as follows.

AX3600 mu-mimo 02

The result is only 821Mbps, and no matter how you set the AX1800 position, it didn’t exceed 900 once, let alone hoping it would break through the gigabit. the IxChariot speed measurement results are as follows.

小米AX3600 2个lan to 2个AX1800

The speed of a single AX1800 is as follows: 837Mbps

AX1800 x1

So as a result my conclusion is that the Xiaomi AX3600 does not support two 2x2mimo receiving devices running in MU-MIMO mode.

I tested the AX3600’s MU-MIMO with Xiaomi 10 and Apple SE 2 as the receiving device a long time ago, but it didn’t work either.

You don’t have to get hung up on this MU-MIMO. it’s hard to make it work in reality.

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