Coordination among base stations (BS) is a powerful approach for mitigating inter-cell interference and maximizing the sum spectral efficiency in cellular systems. In practice, however, coordination with a large number of BS may not be feasible due to excessive overheads associated with BS coordination, e.g., complexity, channel estimation and channel feedback. One practical solution for implementing multi-cell coordination is, therefore, to form a BS cluster so that a limited number of BS are coordinated to control intra-cluster interference with a reasonable amount of overhead.
Existing cellular network analyses, and even simulations, typically use the standard path loss model where received power decays 1/d^x over a distance d, with a pathloss exponent x. This model leads to tractable analysis of downlink cellular network performance with base stations distributed by a Poisson point process. However, it is widely known that this standard path loss model is quite idealized, and that in most scenarios the path loss exponent x is itself a function of d.
Join Prof. Andrea Alù as he shares insight into his work with metamaterials, light and an "invisibility cloak."
The drone revolution isn’t coming—it’s already here. Can UT expertise help us navigate the future?
Reciprocity is a general symmetry property that applies to the vast majority of materials. If an antenna transmits towards a specific direction, it must also receive signals from that same direction. To protect sources and improve communication systems, it is desirable to build components not bound by reciprocity requirements that can transmit and receive signals in the same channel without interference.
Cyber-Physical Systems (CPS) promise great advances to society in fields such as transportation and healthcare. CPS are computer systems that interact directly with the physical world, such as in robotics or self-driving cars.
The challenge, according to WNCG Prof. Andreas Gerstlauer, is these systems must operate within tight constraints imposed by their physical environment. They must be able to complete tasks on time and with minimal overhead in a real-world environment.
Prof. Sriram Vishwanath’s proposal on Designing Sparse Regression Codes and Non-Binary Spatially Coupled Codes for Enabling High Gain Low Latency 100G Wireless Communication was selected for the 2015 Samsung Global Research Outreach (GRO) Program.
Currently, local utilities in the U.S. generate 12 percent more energy than they anticipate needing. Otherwise, if they experience a brownout or blackout, utility companies face heavy penalties from the government.
“Most of that extra energy is going to waste,” WNCG Prof. Brian Evans states. “If utility companies had access to better information, they could predict user demand and how it evolves over the day. They could reduce energy waste by around four-to-six percent.”
While much work has been done to further image quality for cameras and smart phones in the visible light spectrum, WNCG student Todd Goodall and his advisor Prof. Bovik have expanded their research to include the quality of infrared images.
“As far as Prof. Bovik and I know, no one has thoroughly studied the natural scene statistics of infrared images,” Goodall states. “Other general image statistics have been studied, but no one has considered the perceptually-relevant natural statistics..”