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一、研究背景当今时代,无线网络技术飞速发展,无线通信服务的内容也扩大到了需要比较宽的频谱且下载速率也要高的多媒体通信业务,但相应的问题也接踵而来,频谱资源短缺、频谱利用率低等问题都影响着无线网络技术的发展。认知无线电是一类能够认知周边条件,可以进行学习的智能体系,可以及时变化部分指数,让其满足信号的持续变动,进而实现对频谱资源的安全性通讯与科学运用。无线网络技术的发展需要大量的频谱,频谱资源有限,在现有的情
First, the research background In today’s era, the rapid development of wireless network technology, wireless communication services also expanded to the need for a wider spectrum and download rates should be high multimedia communications services, but the corresponding problems are ensued, the shortage of spectrum resources, Low spectrum utilization and other issues all affect the development of wireless network technology. Cognitive radio is a type of intelligent system that can learn peripheral conditions and can learn. It can change some indices in time to meet the continuous changes of signals, and then realize the secure communication and scientific application of spectrum resources. The development of wireless network technology requires a large number of spectrum, limited spectrum resources, in the existing situation