Abstract
This topic can introduce MU-MIMO information in terms GPON ONT and Router.
Wi-Fi signals ar transmitted and received through antennas. what's going to facilitate if the Wi-Fi is just too slow? Add additional antennas. This methodology of victimisation multiple antennas to enhance wireless transmission quality is named multiple-input multiple-output (MIMO). it's become a vital component of wireless communication standards as well as IEEE 802.11n (first Wi-Fi standards that introduced MIMO), considerably increasing the theoretical Wi-Fi rate.
Definition of MIMO
A MIMO antenna system includes m transmit antennas and n receive antennas. Signals ar transmitted and received by multiple antennas at the transmit finish and also the receive finish, enhancing communication quality. MIMO multiplies the capability of a system channel by victimisation multiple transmit antennas and receive antennas underneath identical spectrum resources and antenna transmit power. With this obvious advantage, MIMO is considered the core technology for next-generation mobile communication.
The following table lists the theoretical air interface rates supported by 802.11n/ac with completely different numbers of spacial streams.
MIMO (m×n)
1×1
2×2
3×3
4×4
IEEE 802.11n
150
300
450
600
IEEE 802.11ac
433
867
1300
1733
MIMO Forms
Based on the numbers of transmit antennas or receive antennas, MIMO will be classified into SISO, SIMO, MISO, and MIMO.
Detailed descriptions ar as follows:
Single-input single-output (SISO)
Single-input multiple-output (SIMO)
Multiple-input single-output (MISO)
In a broad sense, SIMO and MISO ar MIMO variations.
Based on the amount of users, MIMO will be classified into single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO).
Definition of MU-MIMO
MU-MIMO permits a router to send information to a most of four Wi-Fi terminals at identical time associated found out an freelance “spatial stream” for every shopper, increasing network resource utilization. Therefore, it's considered associate innovative technology within the wireless development method within the business. Note that each the router and Wi-Fi terminals ought to support MU-MIMO.
Difference from SU-MIMO
A conventional single-user MIMO (SU-MIMO) router will communicate with only one device at a time. With the appearance of a fully-connected era and continuous increase of Wi-Fi terminals, associate SU-MIMO router should communicate with Wi-Fi terminals one by one successively. every access device keeps preempting resources, the router is full, and also the access rate for every device is slow.
In addition, a router typically has three to four antennas, associated an access terminal typically has only one or a pair of antennas. as a result of the SU-MIMO router will communicate with only one Wi-Fi terminal at a time, it's tough for a Wi-Fi terminal to occupy all transmission channels. As a result, some antennas of the router ar idle.
For example, the theoretical transmission rate of a router that supports the IEEE 11ac 4×4 MU-MIMO is up to 1733 Mbps. once the router is connected to and transmits information to a Wi-Fi terminal (with one antenna) that doesn't support MU-MIMO, the most theoretical transmission rate is just 433 Mbps. The remaining one.3 Gbps capability is idle at that point. If each the router and also the Wi-Fi terminal support alphabetic character MIMO, the router will be connected to and transmit information with a most of four Wi-Fi terminals at identical time. during this method, the whole capability of the router is absolutely utilised.
Advantages of MU-MIMO
Increases the network capability and spectrum utilization.
MU-MIMO will effectively boost the whole capability of a wireless router by a pair of to three times that within the SU-MIMO era.
Meets high information measure necessities of applications like the video service.
MU-MIMO eliminates idle MIMO intervals and improves the info transmission potency on the network. Therefore, it will higher meet the wants of video, audio, and different bandwidth-hungry applications.
Improves user expertise of ancient Wi-Fi terminals.
The overall potency improvement brought by MU-MIMO allows additional idle time or capability on the network to serve ancient Wi-Fi terminals (that support solely SU-MIMO). That is, the applying expertise of ancient Wi-Fi terminals can even be improved.
https://forum.huawei.com/enterprise/en/what-is-mimo/thread/591034-100181
https://info.support.huawei.com/network/ptmngsys/Web/ONT_Basics/en/htmlfiles/mimo.html
