| Baseband signal processing,employed as an essential constituent unit in software defined radio system,its computing speed,computing ability,data throughput rate also have a great influence on the performance of the software defined radio system.The traditional software defined radio baseband signal processing system adopts ADC + FPGA+DSP mode,but the data transmission between FPGA and DSP become the bottleneck of the whole design.ZYNQ is a new generation of mixed-processors,it can solve the bottleneck of data transmission between FPGA and DSP,help to improve the speed of baseband signal processing.And it has an advantage in cost and integration.The ZYNQ chip is used as the core of the baseband signal processing system,consequently,this dissertation is focused on the software radio baseband signal processing technology based on ZYNQ.The main contributions are further explained below.1、The characteristics of ZYNQ architecture and FPGA/DSP architecture are compared from three aspects of processor computing power,data interaction and development complexity.The design scheme of the baseband signal processing system based on ZYNQ chip is given.First,the hardware part of the baseband signal processing system is designed from two aspects: the overall structure of the hardware circuit and the key circuit.And then the overall structure of the software design is given.The work flow and design method of digital modulator and demodulator are described in detail.2、The design and implementation of baseband signal processing IP core based on AXI bus is studied.The basic principle of the baseband signal processing algorithm is analyzed,and the modulation and demodulation algorithm model is set up in MATLAB/Simulink.The simulation results show that the algorithm is correct.The implementation of the algorithm is converted into HDL Verilog hardware description language.The modulation and demodulation algorithm is encapsulated into IP core with AXI_Lite interface,improving the bandwidth of data transmission between ZYNQ processor and modulation and demodulation IP core.3、Data interaction method between PS and PL is studied.The Scatter/Gather Mode of DMA is proposed.Designed and implemented the Scatter/Gather Mode of DMA controller.A high speed data path is provided for the data transmission between programmable logic(PL)and processor(PS).4、By building the test platform,the thesis verifies the logic functions of the baseband signal processing IP core based on AXI bus and the data transmission performance of the Scatter/Gather Mode DMA controller.The results show that the design achieve expected functionality. |
