Open air is getting crowded. Signals streaming back and forth from smart devices stretch existing fourth-generation wireless networks almost to their limits.
And as demands on these systems keep increasing, several major research projects led by University of Wisconsin-Madison engineers aim to open new frontiers in cutting-edge wireless communications. The efforts are part of a far-reaching new National Science Foundation (NSF) initiative, announced July 15, 2016, to develop the next generation of wireless technologies.
“These four awards given to the researchers at the University of Wisconsin at Madison demonstrate NSF commitments to enabling fundamental wireless research, advancing innovative communication infrastructure, and encouraging collaborations among experts in academia and industry,” says Thyaga Nandagopal, NSF program director.
Across the country, the NSF will help establish research platforms and collaborations between academia and industry to investigate, develop and begin implementing key components for the future of communication infrastructure. At UW-Madison, Akbar Sayeed and Xinyu Zhang, both faculty members in electrical and computer engineering, and Suman Banerjee, a professor of computer science and of electrical and computer engineering, will embark on a total of four pivotal projects.
“This is a really exciting time,” says Sayeed. “A lot of new innovations, like smart cities, autonomous vehicles, and the Internet of Things, rest on very fast wireless connectivity.”
Even now, existing communication networks can barely keep up with the modern world’s insatiable appetite for data.
“The need for research advances in wireless communication and mobile systems is stronger than ever before, especially as users continue to expect robust anytime, anywhere access through their personal devices,” says Banerjee.
Currently, all wireless networks compete for a signal space from a limited amount of bandwidth on the electromagnetic spectrum. Information travels as waves, defined by their frequencies and wavelengths, and right now everything operates below frequencies of 5 gigahertz. Higher frequencies, the so-called of 5G millimeter-wave technologies, promise vastly improved performance in both data delivery speed and signal lag-time, which is called “latency.” But using millimeter-wave frequencies in the real world is largely beyond the reach of current technologies.
“Harnessing the full potential of millimeter-wave wireless will require a coordinated approach across industry, academia and government agencies,” says Sayeed. “Research advances are needed in communication and signal processing techniques, antennas, digital hardware, and wireless networking.”
Given so many disparate avenues of investigation, Sayeed will act as principal investigator for a research coordination network, designed to foster collaboration and promote rapid dissemination of results. In addition to bringing together established field leaders, the network will make a special effort to include innovative new perspectives from junior faculty members and underrepresented groups.
“NSF has a long, proud history of catalyzing fundamental research in networking and communications that has resulted in profound impacts for science and society,” said Jim Kurose, head of Computer and Information Science and Engineering at NSF. “Fundamental research on advanced wireless will be transformative and take us beyond the current and next generation of wireless—beyond what has been envisioned thus far.”
In addition to being a hub for collaboration, UW-Madison will play host to two wireless testbeds to evaluate the performance of new innovations. One project, called WiNEST, led by Banerjee, will establish infrastructure throughout the city of Madison to enable large-scale experiments in real-world settings at currently used frequencies. The other effort, called Multi-beam MIMO, led by Sayeed, will develop a testbed network using a state-of-the-art millimeter-wave prototype technology for simultaneously steering multiple signal beams. The testbed will enable real-time testing of new communication protocols as well as critical measurements for the challenging problem of steering multiple signal beams at millimeter-wave frequencies.
Wisconsin is already a hot spot for advanced wireless research. In 2015, the nation’s first millimeter-wave software radio testbed, WiMi, an NSF-supported project led by Zhang, successfully demonstrated data transmission at 60 gigahertz. More recently Sayeed’s group successfully demonstrated the first prototype capable of real-time communication of multi-beam data signals at 28 gigahertz, as part of two NSF-funded projects.
As principal investigator on a networking technology and systems grant under the new initiative, Zhang will apply his expertise to ensuring that next-generation wireless can operate efficiently, fairly, and at large scales.
Making the future of communication a reality will require extensive collaboration between academia and industry, which can ultimately benefit everyone.
“The beauty is that you can push both fronts of basic science and the technology,” says Sayeed. “We are not only doing basic theory development, but also scaling up the prototypes to big test-beds and working toward commercialization.”
These new research projects will also provide unique learning and research opportunities for training the wireless engineers and innovators of the future.
The nationwide, seven-year, $400 million initiative was announced July 15 by an official White House news release. The four projects at UW-Madison total $1.85 million of support over three years.
Author: Sam Million-Weaver