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
Future wireless networks will have no capacity limits
on March 15, 2018 at 7:46 am
However, massive multiple input, multiple output (MIMO) antennas will provide for unlimited and thus vast streams of data to be communicated over the airwaves, says Emil Björnson and his fellow researchers at Swedish Linköping University. He says his ... […]
Study Shows Massive MIMO Could Offer Unlimited Capacity
on March 13, 2018 at 12:37 pm
As wireless operators increasingly look to massive MIMO technology to bolster their networks, a new study suggests those antenna systems could theoretically allow data transfers with no limits on their capacity. "We can show that massive MIMO has unlimited ... […]
Ooredoo Oman conducts tests on massive MIMO in home broadband
on March 13, 2018 at 2:32 am
Ooredoo Oman has successfully deployed a massive multiple-input and multiple-output (Massive MIMO) trial in Home Broadband. The test showed that by using the appropriate consumer equipment (CPE), speeds and capacity were increased by more than five times. […]
Massive MIMO network technology could mean unlimited mobile data capacity, research suggests
on March 12, 2018 at 9:58 am
Massive MIMO, a networking technology used to boost 4G and 5G communications, can expand networking data capacity indefinitely despite earlier assumptions, according to new research. Massive MIMO is an antenna technology that is seeing significant adoption ... […]
Mobile World Congress 2018: Startups Push Hybrid Approach for Massive MIMO Antennas
on March 8, 2018 at 6:00 am
At Mobile World Congress (MWC) in Barcelona last week, there were a number of companies offering improvements to massive MIMO (multiple input multiple output) technology. Massive MIMO systems use a large number of antennas—say, 64—to transmit and ... […]
Cobham works with China Mobile to develop 5G Massive MIMO
on March 8, 2018 at 4:31 am
Cobham Wireless announced that it has delivered its massive MIMO (Multiple-In-Multiple-Out) test solution to China Mobile Research Institute, to enable the operator to benefit from the capacity and performance gains of digital Massive MIMO technology. […]
Philippines to see first FDD Massive MIMO trials
on March 8, 2018 at 2:16 am
Globe Telecom has partnered with Huawei to commence the trial of the world's first FDD Massive MIMO commercial product. FDD Massive MIMO is expected to boost cell capacity by a factor of two to three times based on legacy terminals compared to the current ... […]
China Mobile uses Cobham to test 5G massive MIMO
on March 8, 2018 at 12:22 am
Cobham Wireless has delivered its test solution to China Mobile to enable the operator to verify the capacity and performance Massive MIMO technology. China Mobile engineers are planning to deploy massive MIMO technology as part of their strategy to ... […]
United States : Sprint Unveils Six 5G-Ready Cities; Significant Milestone Toward Launching First 5G Mobile Network in the U.S.
on March 3, 2018 at 4:04 pm
Customers in Chicago, Dallas and Los Angeles will begin experiencing 5G-like capabilities, including significant increases in data speed and capacity, as Sprint rolls out advanced network technology called Massive MIMO. Sprint will aggressively expand to ... […]
via Google News and Bing News