Features:
The full name of MU-MIMO is: "Multi-User Multiple-Input Multiple-Output"
From 802.11b/g to 802.11n to 802.11ac, with the evolution of the version number, its theoretical transmission speed has been continuously improved, but the signal transmission method has not changed. A client communicates for transmission, and only after one client is served will the next one be served. Therefore, when there are many connected devices, the data transmission speed will be very slow.
The MU-MIMO technology allows the router to communicate with multiple devices at the same time and improves the utilization of network resources. Its actual wireless transmission rate is much faster than that of devices that do not support MU-MIMO technology. From the perspective of devices such as mobile phones/tablets , Supporting MU-MIMO will make the device network faster, connect to the router more quickly, and consume less power when connecting to WiFi.
Therefore, a device with MU-MIMO technology is also called a full version of 802.11ac.
Uplink MU-MIMO: Different users use the same time-frequency resources for uplink transmission (single antenna transmission). From the receiving end, these data streams can be regarded as different antennas from a user terminal, thus forming a virtual MIMO system , namely uplink MU-MIMO.
Downlink MU-MIMO: multiple data streams are transmitted to different user terminals, and multiple user terminals and eNB form a downlink MU-MIMO system; downlink MU-MIMO can be separated and transmitted to different User data streams; downlink MU-MIMO can also use beamforming at the transmitter to separate the data streams of different users in advance, thereby simplifying the operation of the receiver.
However, MU-MIMO technology needs to be supported by both sending and receiving devices, that is, routers, mobile phones, tablets, etc. need to support MU-MIMO to achieve its effect.