The Application And Research On FPGA In The Digital Signal Processing

Digital Signal Processing is one of the subjects expanding rapidly in the field of information science during the past" several decades. At present, It has applied extensively in many subjects such as communications, radar, sonar, speech and image processing etc. General speaking, there are 3 ways to implement the digital signal processing algorithms, programming DSP for general purpose, ASIC and DSP chipset with invariable function for special purpose, FPGA that can be programmed by user. With the development of micro-electronics technology, realizing digital signal processing with FPGA develops rapidly, more and more, FPGA is used in the arithmetic of front-end digital signal processing in place of ASIC and PDSP.The paper mainly probes into the realization of digital signal processing based on FPGA. At first the fundamental theory of digital signal processing and the DFT algorithm are expounds, then radix-2 FFT and the characteristic of DIT FFT are discussed. In this paper, the description method and style of hardware description language and its development environment MAXPLUSII are detailed. On the basis of that, the high level design method of integrated digital system and the partition of design level of digital system are discussed, the top-down design strategy and the high level synthesis method of digital system are also detailed. After doing that, the paper points out the universal architectures of the high-speed real-time signal processing system and describes how to implement them.. Since FFT plays an important role in digital signal processing, implementing FFT with FPGA is presented and the total realization graph is designed. For improving speed and decreasing computing complexity, high efficiency multiplier algorithm is used to realizing twiddle factor multiplier of butterfly processing unit.