The Key Technologies Of Software Radio Realization

According to the critical technology of software radio,this paper preliminary disserted basic theories which are related to the software radio,and studied the proerties of bandpass sampling and its application on signal sampling deeply.The method of the sampling rate conversion,which is the important,essential theory in software radioes studied carefully.In the paper,one of the emphasis is placed on the discussion of the algorithm of IF direct sampling,and compared the difference of the function between the tradition method and the new method, Using the new method ,we realized digital down converter(DDC), which is one of the critical technology of software radio,based on the hardware.finally we studied the bad influence on the system of software radio which is arised by nonuniformly sampled signal,and showed the some characteristics of digital spectrum of a sort of nonuniformly sampled signal,and studied the algorithm of the reconstruction technique signal sampled nonuniformly, it is the groundwork of the signal be reconstructed,and the signal is sampled by using several A7D.