关键词: 认知无线电, 分布式网络, 频谱共享, 交会, 智能分析

Abstract: Secondary Users（SUs） use the Channel Hopping（CH） sequences to sharing dynamic spectrum is one of the solution to the problem in spectrum sharing for distributed Cognitive Radio Networks（CRN）. In this type of spectrum sharing, SUs tune themselves to the idle channels following predetermined CH sequences, and realize rendezvous with each other during this process. According to the characteristics of distributed CRN, this paper proposes a super frame under MAC protocol for rendezvous operation which has the aim of getting better system performance. An intelligent spectrum database is proposed to store the spectrum sensing results and the channel occupancy history. The database is used to support the actions of channel accessing for SUs. Simulation results show that the proposed MAC protocol can get a better comprehensive performanceunder high traffic conditions.

Key words: cognitive radio, distributed network, spectrum sharing, rendezvous, intelligent analysis