FRITZ!Box 7530 Service - Knowledge Base
Improving wireless LAN performance in your home network with MU-MIMO
MIMO (multiple-input multiple-output) is a technique in radio technology that transmits data using multiple antennas at the same time. Using multiple antennas increases the stability and data throughput of a radio network, thus ensuring optimum transmission performance. MIMO is used in the mobile and wireless communication field.
Since an increasing number of mobile devices such as smartphones or tablets are used in the home network and the need for high data throughput is constantly increasing due to online gaming and media streaming, the flow of data must be optimally distributed to the individual receiving devices. Using multiple antennas with MIMO ensures faster and more stable wireless transmissions. The new MU-MIMO technology has been optimized even further: Instead of only transmitting to one receiving device as with the older SU-MIMO (single-user MIMO) technology, the new MU-MIMO technology can transmit data to several receivers at the same time.
Multiple antenna technique MIMO
A particular spatial arrangement of several antennas results in different angles of incidence, and thus a kind of fingerprint for each antenna. This fingerprint enables the transmitter to determine the location of the receiver and increase the signal strength in its direction (beamforming). The receiver can use this fingerprint to distinguish the individual antennas of the transmitter and thus receive different data streams from them at the same time. This results in stable and fast data transmission.
SU-MIMO (single-user MIMO)
The older MIMO technology can transmit several data streams to a receiver at the same time.
If, for example, a wireless router transmits data with 3x3 MIMO to a wireless device with 2x2 MIMO, then a third of the bandwidth remains unused for the duration of this transmission. If a wireless device with only one antenna is then used, two thirds of the bandwidth will not be used for the duration of this transmission.
MU-MIMO (multi-user MIMO)
The newer MIMO technology can transmit multiple data streams to several receivers at the same time.
If, for example, a 4x4 MU-MIMO router (for example FRITZ!Box 7590) transmits data to a wireless device with 2x2 MIMO (for example FRITZ!WLAN Stick AC 860), either two wireless devices with a single antenna each or another wireless device with 2x2 MIMO can receive data simultaneously during this transmission. Wireless devices with 4x4 MIMO can use the full bandwidth of a 4x4 MU-MIMO router within a transmission interval.
This reduction in waiting time for all devices increases data throughput in the entire WLAN radio network. MU-MIMO therefore also has a positive effect on the connection of devices with only one antenna that are not capable of MIMO transmission. Due to fast data transmission, they can switch back to power-saving mode more quickly without long waiting times, which in turn has a positive effect on battery runtime. Beamforming also produces a directional effect for each individual wireless device so that signal quality is better. As fewer errors occur during transmission, it does not have to be repeated as often, which further increases the speed.