MIMO – “Multiple Input, Multiple Output”
MIMO technology-Antenna Technology Future superfast 5G.
MIMO has Unlimited Capacity,both mathematically and with the aid of simulations.
The research community has agreed that there is an upper limit to how much data can be transferred wirelessly per second.
Pilot Contamination-Disturbance that arises when measuring how the wireless signal Travel.
By deploying more antennas and processing the signals that are transmitted and received from them in the right way, we can create a system in which there is no upper limit for how much data can be transferred.
The technology involves connecting hundreds of small antennas, each with a power of around 10 mW, either in something that can resemble a large computer monitor or distributed across the façade of a building.
All the antennas send a few tens of signals with carefully determined delays. The delays are chosen so that the copies of a signal arrive at the intended receivers at exactly the same instant, but at slightly different times at all other receivers.
This gives a strong signal at the intended receiver and only a slight disturbance at all the others. Pilot contamination arises when the delays are to be estimated using signals known as “pilots.”
One hundred antennas each of 10 mW gives a power of 1 W, which is distributed among the users.
This is considerably less than the 40 W that current antennas use. The low power is enough, since each signal is given in a specified direction.
Massive MIMO thus provides a combination of low output power, high energy efficiency and superior capacity, since many receivers can receive signals at the same time. What the new calculations and simulations have shown is that the capacity is infinite.
We can continue to deploy increasing numbers of antennas, as people consume ever increasing amounts of wireless data, and in this way satisfy the demand.