February 25, 2013
Stevens professor breaks down cell phone network barriers and evaluates effects of social networks
Dr. Rajarathnam Chandramouli of the Department of Electrical and Computer Engineering at Stevens Institute of Technology has been named a 2013-2014 Distinguished Lecturer by the IEEE Communications Society (ComSoc). Nominated by IEEE Technical Committee on Cognitive Networks, Dr. Chandramouli was chosen by the ComSoc selection committee for his achievements, contributions to IEEE, and the currency and relevance of his research. IEEE chapters around the world will review the Distinguished Lecturers’ papers and host the speakers in their region.
“The topics of Dr. Chandramouli’s lectures are very timely in the context of an ongoing White House initiative to nearly double the availability of radio spectrum for mobile devices and develop a nationwide, interoperable wireless network for public safety so that crisis response teams from different cities and agencies can communicate freely in an emergency,” says Dr. Michael Bruno, Dean of the Charles V. Schaefer, Jr. School of Engineering and Science. “Cognitive radio is a technology poised to realize these national goals.”
For his Distinguished Lectureship, Dr. Chandramouli has proposed three topics on cognitive radio networks and one on social networks. In cognitive networks, he will expound upon the fundamental research problems in cognitive networking and the various layer protocols in the network stack, describe how to build a working cognitive radio prototype using commercially available hardware components and open-source software, and scrutinize the intersection of spectrum policies and wireless technology.
Dr. Chandramouli began his work on cognitive radio in response to reports of interoperability problems between radios used by public agencies in emergency situations, most notably as experienced by 9/11 responders. With Dr. K. P. Subbalakshmi, he received a National Institute of Justice grant for research into a system consisting of a low-cost mobile gateway with a router and intelligence in a wireless cloud. The cloud senses an emergency situation and instructs the router to reconfigure its parameters to operate on multiple bands simultaneously. Various agencies, who would previously have been working on their exclusive frequencies, could then connect to the cognitive radio router, which translates and authenticates between frequencies and bands seamlessly, in real time to provide interoperability. In an emergency situation when a service provider is experiencing problems, the "cognitive" technology senses radio channels and networks to find best combination and reconfigures the network in real time so that users can take advantage of the strongest link. According to Dr. Yu-Dong Yao, Director of the Department of Electrical and Computer Engineering, “After Hurricane Sandy, wireless users of certain carriers in our area experienced outages, while other users were fortunate enough to have continued service. If Dr. Chandramouli’s cognitive radio technology were implemented, the public could benefit by continuity of service in emergency situations.” The Stevens collaborators have brought versatility and security to the technology, respectively, and they have started a company named Dynamic Spectrum, LLC to commercialize their innovations.
Dr. Chandramouli will also deliver a lecture on methods for collection and mathematical modeling of data from social networks. He will demonstrate how to use these methods to examine information flow between social movements. For example, the “Arab Spring”, an ongoing wave of demonstrations, protests and wars across the Arab world, began in Tunisia at least partially in response to dissatisfaction with local government and spread from country to country, forcing rulers from power in Tunisia, Egypt, Libya, and Yemen. The movement proliferated largely due to heavy use of social media like Twitter and Facebook to disseminate information and organize protests. Dr. Chandramouli is conducting research on how to model and measure the influence of these social media tools and evaluate the impact from one movement to the next.
Professor Chandramouli is an eminent researcher in the fields of cognitive radio and social networks. He was the Founding Chair of the IEEE COMSOC Technical Committee on Cognitive Networks, Member of the IEEE COMSOC Standards Board and serves on several journal Editoral Boards and international conference organization committees. He has given plenary and keynote talks in several major international conferences. He is a recipient of the NSF CAREER award.