DVB-C Modulator Design Based On FPGA

Many communication,audio and video,image system can't be simply completed by DSP when considering elements of cost,system power consumption and time to market. Development of FPGA provide new resolution of these system, advantage of rate of performance to cost and portability of system resolution based FPGA make it have wide future.FPGA and DVB standard are introduced firstly, DVB-C standard and composition of its system are analyzed completely,development of modulator structure and DVB-C digital modulator composition are presented, more over, analysis of respective modular are given.Then, principle of DVB-C digital modulator system are presented, they are Error control technique,MQAM,Nyquist rule and root raised cosine filter,Window design method for FIR filter,Multi-rate signal processing( integer interpolating, Conversion of Fractional sampling, Equal conversion of net structure, polyphase structure for filter, poly-phase structure for interpolator, Multi-stage implementation of samplying conversion),distrubited algorithm,CIC filter,DDS,Cordic algorithm.What's more, Modeling of MATLAB is processed, part of simulation functionsand m language codes are given.Then, to guide FPGA design, structure and principle of FPGA,principle and technique and flow of FPGA design are all explained in detail, then much attention are paid to the FPGA implementation of every module, with the simulation method and its results and synthesized results.In the last, test and optimization of DVB-C modulator system are addressed. Methods of test and some items which should be paid attention of digital carrier level and rate of carrier to noise,relationship between BER and C/N,MER(modulator error rate) are given, some test results got by analyzer are all up to DVB-C test standard. Meanwhile I give analysis method of constellation map. To update system, system optimization direction is taken as the most important thing, such as choice of modulator parameter, reduce power dissipation, improve circuit work frequency,.In the process of design, I consider the relationship between performance and resource utilization to realize the purpose of resource minimization and best performance. I use special instrument to test items of modulator(( frequency,constellation),all up to the anticipated performance, so the system could be made into ASIC which could be served to the digital society.