The Technology Of Multiple Modulation And Synthesis Of Multiple Waveforms In Software Radio

This paper introduces a project, in which the framework of 'DDS+DSP"is adopted to accomp1ish mutiple modulation and synethesis of mutip1ewaveforms, and gives the numeration through Quadrature AInp1itude Modulationto achieve the synthesis of mutip1e waveforms. Then, the fo11owings recountt the methods to imp1ement some modulations (AM l DSB,SSB,NBFM,w/4-DQPSK,GMSK,16QAM ) through QAM in detail, then give theirspectrums. Pinal ly, the spectrum characteristics of the synthesi s of mut iplewaveforms are analyzed.