Cognitive radio and complex spectrum connectivity are two other phenomena that influence the world of wireless networking. We have developed an experimental cognitive simulation system to research role information representation reasoning technologies. A traditional often follows same protocol when working in a certain contact mode is effective or failing at specified task. GPS has become popul...

• Opportunistic spectrum access (OSA) in cognitive radio networks: using efficiently the radio frequency spectrum • Traditional static spectrum allocation to licensed primary users (PUs): severe inefficiencies, measurements indicate low spectrum utilization (under 30 %) • Dramatic demand surge for spectrum access by unlicensed secondary users (SUs), due to emerging technologies • OSA: dynamical...

The natural acoustic system used by marine mammals and the artificial sonar system used by humans coexist in the underwater cognitive sonar communication networks (CSCN). They share the spectrum when they are in the same waters. The CSCN detects the natural acoustic signal depending on cooperative spectrum sensing of sonar nodes. In order to improve spectrum sensing performance of CSCN, the opt...