Dr. Yeshekel Bar-Ness and his doctoral students, Songping Wu (left) and Seokhyun Yoon, are developing technologies to enable the next generation of wireless communications.
Technologies to enable the next generation of wireless digital communications are the focus of research at the Center for Communications and Signal Processing. Yeheskel Bar-Ness, distinguished professor of electrical and computer engineering and director of the center, leads a team of researchers working to develop the infrastructure needed to support the burgeoning demand for wireless communication. The group addresses issues such as privacy and security, interference and jamming, ever heavier user traffic, and rapid transmission of data through wireless networks. Dr. Bar-Ness recently filed for patents on next-generation devices with two of his doctoral students:
- With SeokHyun Yoon, a parallel decoding algorithm of Turbo Codes was developed, especially for high-speed data communication system. Error correction codes play an important role in wireless systems, since communication is easily contaminated by channel defects, like noise and fading. A recent innovation known as Turbo Code -- a strong error correction code -- has improved error correction greatly. However, Turbo Code's computational complexity makes hardware implementation complicated for reasonable decoding delay. Yoon's parallel algorithm provides scalable decoding delay without any additional computation or performance degradation.
- With Songping Wu, a patent was filed for a new phase noise suppression method for highspeed wireless data communications. In order to conserve frequency resources and combat time dispersion of channels, a transmission technique known as OFDM (orthagonal frequency division multiplexing) is often used by wireless systems since it allows signals to overlap, sharing bandwidth more efficiently. This technique depends on phase synchronization, and phase noise can result in severe interference disrupting communications. Wu's invention provides an inexpensive way to subdue phase noise.