Massive MIMO is an antenna technology that is considered the most promising for future superfast 5G networks, although researchers have until now believed that there is an upper limit for how much data can be transferred. LiU researcher Emil Björnson has shown that there is no such limit.
The massive MIMO technology aroused the interest of 5G researchers at an early stage. However, during the past five to ten years the research community has agreed that there is an upper limit to how much data can be transferred wirelessly per second, given a certain bandwidth and within a certain area. The limiting factor has been a type of disturbance that arises when measuring how the wireless signals travel, known by researchers as “pilot contamination”.
“This conclusion is the result of us using a model that was far too focused on reseach tractability and a method that was too simple,” says Emil Björnson.
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.
He has presented the evidence for this in collaboration with colleagues in France and Italy in an article that has been published both in the open service Arxiv and in the IEEE digital service Xplore. The simulation code is also freely available at Github for anyone who doubts the results and wants to validate them.
MIMO is an acronym for “Multiple Input, Multiple Output” and 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.
The three researchers discovered the solution to the “pilot contamination problem” while working with the book “Massive MIMO Networks: Spectral, Energy and Hardware Efficiency.”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.
“The consequence is that 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,” says Emil Björnson.
The Latest on: Massive MIMO
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The Latest on: Massive MIMO
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- Nokia delivers record 5G capacity gains via software upgradeon March 25, 2020 at 4:52 pm
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- Rohde & Schwarz presents new test solutions for 5G base stationson March 24, 2020 at 2:15 pm
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- Nokia notches 4X capacity boost in Sprint teston March 24, 2020 at 1:42 pm
and Multi-User-MIMO (MU-MIMO) using Sprint’s mid-band 5G spectrum and Nokia’s AirScale solution to deliver 3 Gbps total downlink cell throughput, in what Nokia called a first. It showcased Nokia’s ...
- Nokia Oyj: Nokia delivers record 5G capacity gains via software upgradeon March 24, 2020 at 1:05 am
The test, which utilized Sprint's 2.5 GHz spectrum as well as commercial devices such as hotspots, leveraged Massive MIMO to achieve 16 layers of MU-MIMO to deliver up to four times the total downlink ...
- Nokia delivers record 5G capacity gains via software upgradeon March 24, 2020 at 1:02 am
The test, which utilized Sprint’s 2.5 GHz spectrum as well as commercial devices such as hotspots, leveraged Massive MIMO to achieve 16 layers of MU-MIMO to deliver up to four times the total ...
- Massive MIMO Market 2020 Technology, Global Size, Share, Business Trends, Top Key Players, Development Status, Industrial Strategy by Forecast to 2023on March 17, 2020 at 6:01 am
Global Massive MIMO Market Research Report Information Segmented by Technology (LTE Advanced, LTE Advanced Pro, 5G), by Antenna Type (8T8R, 16T16R and 32T32R, 64T64R, 128T128R and Above), by Spectrum ...
- Massive MIMO Market Growing With 41.6% CAGR And Forecast By 2026 | Key Players: Nokia, Ericsson, Huawei, Verizon Communications, ZTE, Sprint And Moreon March 16, 2020 at 4:24 am
The Global Massive MIMO Market is projected to grow with a striking growth rate of 41.6 % over the forecast period 2019-2026, divulges the latest research report presented by Big Market Research. Top ...
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