Qdpsk Modulation And Demodulation Based On FPGA Technology Research And Implementation Of

For distance, large communication capability and high transmission quality arerequired in modern communication system. Modulation and demodulation, which is one ofthe most key techniques in communication, has always been an important aspect ofresearching field. The modern realized by FPGA has many advantages, such as smallervolume, low-power dissipation, integrity high, updated of software, capability ofantijamming and so on. This is in accordance with the direction of the future thechniquesdevelopment. This thesis primarily discusses the modulation and demodulationcommunication system based on FPGA from some aspects below.First, the thesis resarches the development and actuality of the modulation anddemodulation technique and the characteristics and the design procedure of FPGA.The thesis introduced the specific realization of the QDPSK modulation anddemodulaton majorly. Firstly, QDPSK modulation and demodulation system are separatlymade, every model of the systems is analyised. And the simulations of the systems aremade by MATLAB, the results of the simulation is satisfying. Secondly, on the right basisof the modulation, C++ algorithm of every model is programmed. Correctness andrealizability of the algorithms are verificated. Lastly, sequential simulation and synthesissimulation are made by Verilog hardware language in QuartusⅡ6.0.