The Researching And Realizing For A SDR Receiver

The main idea of software defined radio(SDR) is to realize the various communication functions with software programs, based on the universal hardware platform。Its reconfigurability and flexibility need sample the signal in RF, but, at present, the device of ADC and DSP can not satisfy the request of ideal software radio. Based on the essential theory research of software radio,a IF architecture of SDR receiver with polyphase filter digital orthogonal transform are brought out in the thesis and the sample frequency of ADC decrease a half。In order to decrease the speed press of DSP ,use FPGA to realize the delay filter and prove that the structure is right and feasible。At the same time,the design of ployphase filter is given, the distributed arithmetic is used to complete filter in order to develop fully the parallel operation ability of FPGA. That results in increasing the speed of the system。USB2.0 is a style of high data transferring.USB2.0 specification and USB device are introduced. The relations between the application program, driver program and firmware, and their development are discussed. The developed USB2.0 interface is satisfy the demands of the system for real time data transmission。...