| This thesis studied some key technologies in digital receiver based on Software-Defined-Radio,especially the parts of Intermediate Frequency procession and Baseband procession. After modeled and simulated the basic modules and frameworks,an approximately system structure is put forward,which provided the foundation to construct a Software-Defined-Radio platform.This system transform miltifrequency and multiaccess signals from Intermediate Frequency to Baseband by application of key technologies in Software-Defined-Radio such as Bandpass Sampling,DDC,Decimation and Accesses Separation.The research in the baseband include Signal Type Identification and Digital Demodulation.In the Signal Type Identification model,some new identificate parameters are put into practice on which came out a more perfect identification.The signal types include SSB,DSB,PSK,AM,ASK,FM,FSK etc.The whole system simulation is employed under the software MATLAB,and the follow works are developed on the SDR platform Daq pc. |
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