Project Leader: Dr. Kyutae Lim

Motivation: In the recent past, Cognitive Radio (CR) technology has been considered an attractive solution for exploiting limited spectrum resources. The CR system implements negotiated or opportunistic spectrum sharing over a wide frequency range covering multiple mobile communication standards. Thus, the CR link intelligently detects the usage of a frequency segment in the radio spectrum, and jumps into any temporarily unused spectrum rapidly without interfering with communication between other authorized users. This technology is very promising for the friendly coexistence of the heterogeneous wireless networks, i.e., cellular, wireless PAN, wireless LAN, and wireless MAN, etc. Recently, the FCC has encouraged the development of CR technology for unlicensed operation in the TV broad casting bands. CR technology has been adopted as a core feature in the emerging wireless access standards such as the IEEE 802.22-Wireless Regional Area Networks (WRAN).
Challenges of enabling CR are 1) Spectrum Sensing, 2) Frequency Agile RF Front-End, 3) Dynamic Frequency Selection and 4) Adaptive Modulation.

Multi-Resolution Spectrum Sensing(MRSS)

Dr. Kyutae Lim
Dr. Youngsik Hur
Dr. Kiseok Yang
Minsik Ahn
Bharath Vootukuru
Taejung Song
Kwanwoo Kim
Jongmin Park