基于FPGA的码率连续可变数字调制技术研究  

Research on FPGA Basedcontinuously Variable Code Rates Digital Modula-tion Technology

作　　者：董高攀 汪洋 刘世刚 DONG Gaopan;WANG Yang;LIU Shigang(School of electronic Infomation,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]中原工学院电子信息学院,河南郑州450007

出　　处：《长江信息通信》2024年第6期199-203,共5页Changjiang Information & Communications

摘　　要：基于信号数字正交调制器原理,改进了码率连续可变的基带信号数字调制器技术。该调制器在FPGA内产生码率连续可变的基带数字正交调制信号,以固定的采样频率将信号送到DAC进行正交调制和上变频。通过使用数控振荡器(NCO)的相位输出作为符号生成时钟和滤波器系数查表地址来控制码元速率和成形滤波器阶数,以及可旁路窄带成形滤波设计,实现了能够连续调节码率的数字调制。能够生成1 KBaud~40 MBaud之间任意码元符号速率的基带调制信号,其中成形滤波器的阶数可调,具有使用灵活,成本较低的优点。Based on the principle of signal digital quadrature modulator,improves the digital modulator technology for bascband signals with continuously variable code rates.This modulator generates a baseband digital quadrature modulation signal with continuously variable code rates within the FPGA,and sends the signal to the DAC for quadrature modulation and up-conversion at a fixed sampling frequency.By using the phase output of a numerically controlled oscillator(NCO)as the symbol generation clock and the filter coefficient lookup table address to control the symbol rate and shaping filter order,as well as a bypass narrowband shaping filter design,a digital modulation that can continuously adjust the code rate has been achieved.Can generate baseband modulation signals with any symbol rate of1 KBaud~40 MBaud,and the order of the shaping filter is adjustable,which has the advantages of flexible use and low cost.

关 键 词：FPGA 码率连续可变 成形滤波器 正交调制 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]