MIMO technology, divided into SU-MIMO and MU-MIMO, is an offshoot of various advances made in order to increase the speed of wireless networks, whether they are domestic, corporate or mobile phones. In an increasingly connected world, the system is critical to smartphones, tablets, laptops and even appliances that access the Internet.
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Responsible for achieving higher transmission rates, MIMO offers more speed for each attached device, for example, helping to improve the signal transmission mode. He was curious about the technology? Check out the main functions, classifications and advantages of the system that is already present in more advanced routers and line tops smartphone as iPhone 6S and Galaxy S7 .
What
MIMO is the acronym for Multiple Input Multiple Output, in a literal translation, it means “Multiple Multiple Input Output”. It is a system that aims to achieve higher transmission rates in wireless networks.
The technology uses multiple antennas to transmit the signal and data on a network. Thus, the more antennas, faster and more efficient the transmission and reception of data to the various connected devices. Hence the name “multiple inputs and outputs”.
This system is the successor to IEEE 802.11n and was named 802.11ac format that received updates in July. In addition to its improvements in the speed of transmission and reception, the standard uses less power and has a more enhanced security.
Main features
The MIMO system has three distinct functions. The STTD, SM and collaborative transmission. STTD is the acronym for Space Time Transmit Diversity. In this mode, all antennas transmit exactly the same signal. This serves to increase the power network. However, the speed remains the same.
In the function SM (Spatial Multiplexing), each antenna transmits different data. This increases network throughput, ie its speed. However, the scope remains the same. This technique is also known as OFDM-MIMO and is used in routers in the 802.11n standard the most current cellular networks.
Finally, the collaborative transmission, more than one router can be combined to have one of the other two systems, bridging the best of both worlds. This mode, however, is the most unusual
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The MIMO system can be classified in the format: “axb: c”. The letter A indicates the number of transmitting antennas, the letter B the number of receiving antennas and the letter C the number of spatial streams. Let the examples:
2×2 MIMO-OFDM system indicates that there are two transmit antennas and two receiver antennas operating in OFDM mode (or Sp), or each transmits different data, increasing the velocity. Thus, it could be described as 2×2: 2. In a 3×3 system: 3, there would be three transmit antennas, three reception in three spatial streams, tripling the speed
Advantages of MIMO
In a traditional wireless network, the router can pay attention to only one device at a time. So imagine that you have a notebook, a tablet and a smartphone connected to the same Wi-Fi network. The notebook is in an online game, the tablet is broadcasting a film by Netflix and the smartphone by streaming the YouTube .
the first router transmits and receives some data from the online game, then to give attention to the game and transmits some data packets to Netflix and then to YouTube. Although the user does not notice these stops, so that routers work.
So, to have a better performance in online matches, it is recommended to turn off everything that can consume bandwidth, such as streaming videos or music. And that’s why when there are many devices connected to the network at the same time the videos lock, for example.
In a MIMO system with three antennas, each antenna transmits a different type of data. So, returning to the situation presented, an antenna would be dedicated to the notebook, the second to the smartphone and the third for the tablet, with no slowdowns.
The MIMO technology can also It is divided into SU-MIMO and MU-MIMO, which means SU single user (single user) and MU means multiple user (multiple users). The MU-MIMO technology is the one that can transmit different types of data simultaneously.
Where does
In the case of technology MU-MIMO, more advanced, you can find it in action on the most recent and advanced routers, such as the Asus RT-AC87U and TP-Link Archer C2600. Some smartphones and tablets line tops also have such a system, such as the iPhone 6S and the Galaxy S7.
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