Situation of Wireless Communication Based on Cognitive Radio

The paper summarizes the functional evolution from software radio to cognition radio.Cognitive radio is a software-defined radio based on the intelligent wireless communication technology.It emphatically resolves how to make use of spectrum resources.The proposal of cognitive concept would challenge the present spectrum management system,and bring new space for the development of wireless communication.Software radio system could,without any change of system hardware,implement various functions at different times by loading the software.Cognitive radio could sense the surrounding electromagnetic environment and realize intelligent exchanges with communications network through radio knowledge description language(RKRL),and by real-time adjustment of the transmission parameters,achieve high reliability and spectrum utilization efficiency of communication system at anytime and anywhere.Based on these,this paper discusses the hot issues in the future development of cognitive radio technology.