by MU-MIMO is shaping up to the next big thing in wireless technology, but how can it help improve wireless performance and how does it work? Sit back and let us tell you. Let's start from the top. MIMO refers to Multiple Input Multiple Output and refers to sending and receiving multiple data signals on the same radio channel and at the same time using a technique called multipath propagation. Most wireless devices today employ MIMO to boost performance and a corollary to this is also the use of multiple antennas at both the transmitting and receiving ends to improve wireless performance. Using multiple antennas to transmit and receive data improves reliability and speed. This is why you sometimes see routers or client devices being referred to as 1x1 or 2x2 or even 3x3. The first number denotes the number of transmitting antennas, while the second refers to the number of receiving antennas. For the most part, most routers and client devices use a symmetrical design.
However, the next part is unknown to most users and it deals with how most routers in the market today work. The vast majority of routers in the market in the market today are SU-MIMO only or Single-User Multiple Input Multiple Output. As hinted by the name, SU-MIMO technology can only transmit to a single user (single device) at a time. This is why performance degrades rapidly as more and more devices are connected to the router. The router has to quickly serve one device and go on to the next, and if there are many devices connected, the “waiting time” gets longer and longer.