Realization Of Spectrum Sensing Technology In Cognitive Radio Based On FPGA

In recent years, as the rapid development of the wireless communication technology, the contradiction between the growing demands and the limited spectrum resources has become one of the main bottlenecks that restrict the development of wireless communication. As a intelligent wireless communication technology, cognitive radio can discovery and reasonably use the free spectrum among distributed spectrum without affect authorized users, which improves the utilization ratio of a existing spectrum. Spectrum sensing is one of the basis of cognitive radio system, which is the first problem to be solved.This paper mainly studies the key technology and a hardware implementation of spectrum sensing used in cognitive radio system. Firstly, it introduced the present research status of cognitive radio at home and aboard, mainly described the spectrum sensing in cognitive radio. Three spectrum detection methods, namely matching filter detection, energy detection and cycle property detection were investigated in detail, for testing and verifying above results, the simulation of energy detection and cycle property detection were completed with Matlab. In this case, the hardware implementation arthitecture of the spectrum sensing in CR is proposed, the RF front-end module and A/D,D/A module are simply introduced, the hardware implementation and verification the digital signal baseband processing based on FPGA are presented in detail.This design is programmed by hardware description language called Verilog HDL, simulated by using ISE9.2i belonged to Xilinx company and Modelsim belonged to Mentor Graphics, which is built on Virtex-ⅡPro FPGA of the Xilinx Corp. This study is useful to explore the research of cognitive radio, which is actively significant for the next research.