Realization Of Software Radio Technology-Modulation And Demodulation-Based On FPGA

The aim of this thesis is to implement the module of modulation and demodulation in the theory of Software Radio.In this thesis, Two types of modulation and demodulation methods are realized. while low data rate, differential quadrature phase-shift keying (DQPSK) and spread spectrum (SS) are presented, while high data rate, complementary code keying (CCK) is provided to meet this requirement.DQPSK has powerful performance of anti-noise and high band utilization ratio. SS has strongly anti-jamming characteristic and it can keep information secret easily. This thesis combined the two methods, achieved the scheduled object. CCK is one method of physical coding of 802.11b. It can transmit high data rate and has SS function. By using this method, expected result is achieved under condition of high data rata.In this thesis, a platform is designed and modulation and demodulation are realized on it. Result validates that it achieves scheduled object.