Ove Edfors, Professor of Radio Systems at Lund University, commented: "A true team work that with great results. Liang Liu, Associate Professor with the Faculty of Engineering at Lund University, said: "In addition to investigating spectrum efficiency gains, an initial power control algorithm was tested, users were placed in different locations and use of the equipment over night to obtain calibration data for comparison purposes with the Lund set-up"įredrik Tufvesson, Professor of Radio Systems at Lund University, added: "Field trials in different deployment scenarios is needed to validate the concept of massive MIMO and we are looking forward to the future mobility test at both universities" To meet capacity demands in the microwave bands the only solution is to deploy technologies offering radically enhanced spectral efficiency hence the global importance of massive MIMO and the significance of smashing through the 100 bits/sec/Hz barrier." Professor Andrew Nix, Dean of Engineering and Head of the CSN Group, commented: "Unlike at mmWave frequencies, below 6GHz, very little new spectrum is anticipated for 5G services. Massive MIMO technology is important if increased capacity is to be reached but it is thought that much of the 5G capacity can and will come in the longer term from using 5G technologies such as millimetre-wave (mmWave) and beamforming. Industry has said it will require a 1,000-fold increase in capacity in order for 5G to function as anticipated. The group's latest achievement with massive MIMO arrays, which are cellular base stations with dozens of antennas deployed at the base station, shows that this technology could deliver ultra-fast data speeds to more smartphones and tablets than ever before. Multiple antenna technology, referred to as MIMO, is already used in many Wi-Fi routers and 4G cellular phone systems. The team beat its earlier record of 79.4 (bits/s)/Hz for 12 users set in March, and the rate of 71 (bits/s)/Hz that Facebook achieved for 24 users last month with its 96-antenna ARIES array. With an identical frame structure they used in the previous experiment, this would equate to a rate of 145.6 bits/s/Hz on a single 20 MHz radio channel. #5g spectral efficiency how toI will exemplify how to achieve high spectral efficiency, great link reliability, and low-power operation.In an experiment last week using 128 base station antennas, the research group managed to serve 22 users, each modulated with 256-QAM, on the same time-frequency resource. In this talk, I will explain the basics of Massive MIMO and the importance of implementing it in the right way in order to reap all the benefits that the technology can deliver. Furthermore, the array gain provided by the directive transmissions allow for reduced transmit powers, which is an enabler for low-power nodes. The use of arrays with many antennas creates the phenomenon of channel hardening, which means that the rapid fading variations that normally haunt wireless links are averaged out, leading to high link reliability. In recent years, Massive MIMO has gone from being a mind-blowing theoretical concept to one of the most promising 5G-enabling technologies several world records in spectral efficiency have been set by Massive MIMO testbeds. Massive MIMO was conceived as the way to deliver very high spectral efficiency in bands below 6 GHz, using spatial multiplexing of tens of users per cell. Massive MIMO is the name of multiantenna technologies that use access points with hundreds of antenna elements. To satisfy all the 5G requirements, we also need to make major improvements in the network operation at conventional cellular frequency bands, below 6 GHz. However, the mmWave operation is inherently unreliable and unsuitable for wide-area coverage. When talking about 5G-enabling technologies, there is much fuss about millimeter wave communications, which is the ideal approach for delivering high data rates over short distances. 5G, the next generation of wireless networks, needs to accommodate massive data traffic, large user numbers, high reliability, and yet provide great energy efficiency.
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