Cognitive radio spectrum technology: history, basic principles and applications

Cognitive radio technology is a new communication technology to cope with the increasing demand and inefficient use of radio spectrum. This paper summarizes the historical development of CR technology, from its initial concept to the present research status and shortcomings. This paper mainly introduces spectrum detection and allocation technology in CR network and some applications of CR technology in real life. This paper makes up for the lack of review papers on the development and application of the latest spectrum technology of CR in recent years. In terms of future challenges, this paper analyzes the environmental and ethical issues faced by this technology in recent years, some research bottlenecks in 6G technology and some breakthroughs in the field of satellite communication.