Fuzzy active period adaptation for dynamic spectrum access in IEEE 802.16h system

The use of ldquocognitive radiordquo (CR) technology is viewed as the key technology to fully utilize the bandwidth. In this paper, a CR-based dynamic spectrum access (DSA) device named fuzzy active period adaptor (FAPA) is proposed in a downlink transmission of IEEE 802.16h systems. FAPA decides the active period of IEEE 802.16h system to efficiently coexist with a WLAN system in unlicensed spectrum. Simulation results show that the fuzzy active period adaptation improve the overall throughput, and reduce the idle time of the spectrum.