Colloquium Summary: 2

• His research interests lie at the intersection of technology and policy.
• He talked about his current researches.
• He first presented the radio spectrum allocation.
• The band appears to be rather crowded. It is allocated but not always used; usage varies across band, time and location.
• So, we need a cognitive radio so that we can utilize spectrum more efficiently.
• He used software defined radios to sense the environment and learn how to adapt.
• What makes cognitive radio networks hard: interference avoidance, detection, computational complexity and security.
• Problem: Interference; Goal: System dynamically adapts to maintain performance goals in presence of interference.
• He varied a lot of parameters to achieve this goal.
• He worked on both simulation and implementation.
• He conducted a measurement and did multivariate analysis to understand the interactions.
• He used multifactor/knobs to improve the bit loss.
• Basic statistical methods and experimentally informed algorithm design provide a useful mechanism for adapting a radio.
• He also mentioned the security issues in his system.