Design And Optimization Of Low-overhead Digital Modulation And Demodulation System

Digital communication technology is the foundation of the rapid development of the national economy.Digital modulation and demodulation technology is an important research direction of modern communication technology and has received more and more attention.In the tactical communication system,the use of differential binary phase shift keying(Differentially Coherent Binary Phase Shift Keying,DBPSK)direct-spread signals has the advantages of anti-interference and anti-multipath effects.Therefore,it is of great significance to study DBPSK modulation and demodulation technology.It is well known that a large number of adder and multipliers are required in digital modulation and demodulation systems,but traditional adder and multiplier designs often meet delay and operation speed problem,which cause the problems of chip area and power consumption.At this time,it is worth mentioning that the remainder system has Parallelism and strong error control capabilities that can help optimize adder and multiplier designs.This paper studies the DBPSK modulation and demodulation system and optimizes it by using the remainder system,which is implemented by FPGA.The main content of the paper is divided into four aspects:Firstly,according to the theoretical basis of digital communication,a design scheme of the DBPSK modulation and demodulation system is proposed,including the design of system parameters and the design of each module at the modulation and demodulation ends.Secondly,each component module and related parameters are described in detail,and the system simulation model is built by simulink in MATLAB.On this basis,the implementation plan of a DBPSK modulation and demodulation system based on traditional algorithms in FPGA is proposed,and it is implemented by verilog language.Thirdly,a testbench simulation is designed to verify the function of the DBPSK modulation and demodulation system,and to analyze the simulated waveforms,and then the resource occupation and power consumption of each module in the system are integrated and analyzed.What's more,an optimization scheme based on the remainder system is proposed and the FIR filter based on the remainder system is designed for shaping filtering and matched filtering in DBPSK modulation and demodulation.The test bench simulation is designed to verify the function of the optimized DBPSK modulation and demodulation system based on the remainder system,and to verify that its function is consistent with the DBPSK modulation and demodulation system under the traditional algorithm.Finally,due to the functional similarities between the DBPSK modulation and demodulation system based on the traditional algorithm and the DBPSK modulation and demodulation system based on the residual system,the optimized DBPSK modulation and demodulation based on the residual system is integrated and analyzed in the resource consumption of each module and the power consumption situation in the system,and then compared with the traditional DBPSK modulation and demodulation system at the same areas as above.The results show a 9.78% reduction of the total power consumption in the DBPSK modulation and demodulation system.In addition,the optimization effect of the main resource consumption type Slice LUTs has reached 79.96%,and other various resources such as Slice Registers and Slice have also been optimized.