认知无线电中消除干扰的频谱礼仪

ognitive radio is a useful technology to solve the situation of spectrum scarcity; its keys include spectrum sensing and dynamic spectrum allocation. Analyzes the main problem of cognitive radio is the interference of secondary users to primary user in license band; in unlicensed band we should eliminate the mutual interference between CR users. This requires high sensitivity to sense the present of primary user and notes the state parameters of other CR users. At the same time, cognitive radio should manage the spectrum access of CR users. Summarized many present methods, such as dynamic database，common control channel and spectrum etiquette, then propose a new ‘sentry’ etiquette bases on ‘credit mechanism’, demonstrates the principle of this spectrum etiquette.