| Cognitive radio has the abilites of environment awareness, learning environmental change,adaptability to environmental change,the high reliability of the communication quality, the full utilization of spectrum of resources and reconfigurable features of system functional modules. Based on this, this thesis do the research on the cognitive reconfigurable radio, multi-modulation, adaptive multi-bandwidth transmission systems.The background and definition of CR, and the key technologies to realize it are presented in this thesis. Based on that, the adaptive transmission system program of CR is proposed with the introduction of reconstruction of CR. The adaptive transmission system is designed and implemented based on the hardware platform of "DSP+FPGA" Especially, details of the designing of CIC compensation filter and adaptive detective-decision threshold are given, and the implementation on the hardware platform is expounded. After debugging, improvements to the system are made according to the results of debugging, which will enhance the function and erformances of the system. Finally, analysis and improvements for the system are given. |
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