Dpsk Modulation And Demodulation Software Radio Based On The Dds

Software defined radio (SDR) technique occupies the more and more important position in current information transmission. Many systems need utilize this technique to transmit all kinds of information, for example, wireless communication, TV, radar, telecontrol and telemetry, etc. It will use some key technique of modulation and demodulation during the information transmission process. From the continous improvement of previous analog AM and FM technique to expanded application of current digital modulation, all of those techniques will make information transmission more effective and reliable.Firstly this paper introduced the analog to digital converter (ADC) and digital to analog converter (DAC) which were necessary for the digital communication. Then it stated the features and design of field programme gate array (FPGA) and system of soft processor core-Microblaze. And the paper also investigated the FPGA implement of direct digital synthesizer (DDS) and the design method of the difference phase shift keying (DPSK) modulation and demodulation based on the FPGA. The Xilinx FPGA component-Virtex 5 with abundant logic sources was selected. Under this integrated surrounding, the inventory function modules or program with VHDL language was used to fulfill the design demand. Furthermore, the DPSK demodulation has been designed with the new system of soft processor core-Microblaze. The summary and development for this paper were shown at last.