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Setting World Records in 5G Wireless Spectral Efficiency

Paul Harris, University of Bristol

"With the NI MIMO Prototyping System, we were able to alleviate some of the pain of this development through an integrated hardware and software platform."

—Paul Harris, University of Bristol

The Challenge

By 2020, Cisco forecasts that 5.5 billion people will own mobile phones. In the UK alone, tens of millions of these mobile users will each consume 20 GB of data per month. Factor in data-hungry applications like 4K video, driverless vehicles, and smart factories, and it’s no surprise that today’s wireless networks cannot handle the rapidly approaching, hyper-connected future.

The Solution

Researchers at the University of Bristol and Lund University are using the NI MIMO Prototyping System to rapidly innovate and advance 5G cellular networks to transform the future of wireless communications. The team has successfully demonstrated greater than 20X increases in bandwidth efficiency compared to 4G, which opens up new, record-setting realms of possibility for 5G deployment.

Innovation Through Multiplication

Unlocking the potential of 5G networks starts with understanding the benefits of Massive MIMO. Massive MIMO uses large numbers of antennas (more than 64) at a base station to spatially multiplex. This means we can serve more users in a dense area without consuming any more radio spectrum or causing interference. In other words, Massive MIMO means fewer dropped calls, a significant decrease in dead zones, and better quality data transmission, all without stretching the limits of our increasingly scarce radio spectrum.

 

Better still, Massive MIMO promises to reduce costs and improve energy efficiency compared with current LTE (4G) networks while providing reliability improvements through redundancy from the increased number of antennas.

 

 

Real-Time, Record-Setting Research

The team from Bristol and Lund set out to test the feasibility of Massive MIMO as a viable technology for bringing greater than 10X capacity gains to future 5G networks. They turned to NI for an extensible MIMO prototyping platform with flexible software defined radio hardware and open reconfigurable LabVIEW software backed by the expertise of the Advanced Wireless Research Group at NI.

 

 

Using the MIMO Prototyping System, the team could focus on applying the theoretical principles of Massive MIMO under real-world conditions and rapidly test new ideas on their way to implementing the world’s first live demonstration of a 128-antenna, real-time Massive MIMO testbed. Using this cutting-edge testbed, the team set two consecutive world records in spectral efficiency. They achieved over 79 b/s/Hz of spectral efficiency over a 20 MHz bandwidth, fully bidirectional, real-time, over-the-air link at 3.5 GHz with 12 simultaneous users. Shortly after, the team extended the system to achieve over 145 b/s/Hz of spectral efficiency by increasing the number of users to 22 sharing the same time-frequency resource.

 

 

 

Technology

The MIMO Prototyping System is a combination of NI commercial off-the-shelf hardware and LabVIEW software. The platform acts as a solid foundation for the high-throughput, high-capacity, low-latency system. The team integrated nearly 100 different pieces of hardware yet seamlessly developed the entire application within a single software framework. This modular approach, tight software/hardware integration, and built-in real-time FPGA IP in LabVIEW gave the team the solution it needed more quickly than anticipated and ensured that future changes to the platform would be cost and time effective.

 

 

What’s Next?

In a joint venture between the University of Bristol and the Bristol City Council called Bristol is Open, the Bristol team plans to deploy its Massive MIMO testbed on a rooftop within the city limits and connect to its fiber-optic network; which will open up the ability to conduct further research into the real-world impact of this technology on society. Eventually, Bristol will split the system into four, 32-antenna subsystems, to use the fiber network for implementing a distributed Massive MIMO configuration. Ultimately, this empowers network operators to establish better methods of communication for us all.

 

 

 

Lund University will soon perform measurements concentrating on outdoor scenarios, channel characterization, and accelerator IP design under more realistic deployment conditions on its very own NI Massive MIMO testbed.

 

Furthermore, Bristol and Lund will continue to collaborate on upcoming activities. Lund will host the Bristol team to conduct outdoor measurement trials with mobile users to further investigate the influence of mobility on Massive MIMO.

 

 

About the Team

The Communication Systems & Networks (CSN) Group at the University of Bristol formed in 1985 to address the research demands of the fixed and wireless communications sectors. It combines fundamental academic research with a strong level of industrial application. The group has well-equipped laboratories with state-of-the-art test and measurement equipment and first-class computational facilities.

 

The University of Bristol Team: Mark Beach, Andrew Nix, Paul Harris, Siming Zhang, Henry Brice, Wael Boukley Hasan, and Benny Chitambira

 

Lund University seeks to be a world-class university that works to understand, explain, and improve our world and the human condition. The Electrical Engineering and Information Technology Department (EIT) at Lund University covers a wide range of research areas in the fields of analog and digital as well as communications system design and has been at the forefront of Massive MIMO (MaMi) research including MaMi theory, channel measurements and characterization, and accelerator IP design.

Bristol and Lund implemented the world's first 128-antenna, real-time massive MIMO testbed, which was used to set two consecutive world records.
The NI MIMO Prototyping System is a modular system based on USRP RIO SDR and PXI hardware that enables a wide array of antenna configurations.
The NI MIMO Application Framework gave the team a head-start on development because of its open, software reference with real-time FPGA IP.
Paul Harris and Steffen Malkowsky test their 128-antenna array in the University of Bristol's anechoic chamber.