基于FPGA的一种数字下变频控制策略研究
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摘要
数字下变频是将中频数字信号下变频到零中频信号,且使信号流速率变速至适合于后级DSP器件处理要求速率的技术,它是软件无线电技术的核心与关键环节。着重以基于多速率处理技术的数字下变频理论为基础,深入探讨了数字下变频原理架构,利用FPGA并行处理优势,结合实际使用需求,在不牺牲FPGA硬件乘法器资源的条件下,提出了一种数字下变频控制策略,使得数字下变频通道中滤波器效果达到最优。为了验证设计的有效性,以某软件无线电平台为实验对象,通过平台的自激与响应形成的闭合回路,验证数字下变频控制策略的有效性,实验结果满足预期设计要求。
The digital down-conversion is a technique of down-converting an intermediate frequency digital signal to a zero-IF signal,which shifting the signal rate to a rate that be suitable for processing of the post-stage DSP device.This technology is the core and key technologies of software radio.In order to make the more detail,the digital downconversion theory based on multi-rate processing technology was discussed in the paper.and a digital down-conversion control strategy was proposed which makes the filter effect reach the best.which taken the advantages of FPGA parallel processing and combined with the actual use of demand,without sacrificing FPGA hardware multiplier resources under the conditions,In order to verify the validity of the design,a software radio platform as a test object,through the platform of self-excitation and response to the formation of closed loop to verify the effectiveness of digital down control strategy,the test results to meet the expected design requirements.
The digital down-conversion is a technique of down-converting an intermediate frequency digital signal to a zero-IF signal,which shifting the signal rate to a rate that be suitable for processing of the post-stage DSP device.This technology is the core and key technologies of software radio.In order to make the more detail,the digital downconversion theory based on multi-rate processing technology was discussed in the paper.and a digital down-conversion control strategy was proposed which makes the filter effect reach the best.which taken the advantages of FPGA parallel processing and combined with the actual use of demand,without sacrificing FPGA hardware multiplier resources under the conditions,In order to verify the validity of the design,a software radio platform as a test object,through the platform of self-excitation and response to the formation of closed loop to verify the effectiveness of digital down control strategy,the test results to meet the expected design requirements.
引文
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[15]宫琴,金慧君,关添,等.基于USB声卡的便携式耳声发射检测系统的研制[J].仪器仪表学报,2010,31(2):383-389.
[2]严家明,李瑾,胡楚锋.基于正交混频的数字下变频技术研究[J].计算机测量与控制,2009,17(1):200-202.
[3]周化雨,张勤.Lagrange半带滤波器在数字抽取滤波器中的应用[J].信号处理,2009,25(4):648-652.
[4]曲春梅.基于FPGA的多通道多速率信号传输研究与设计[D].成都:成都理工大学,2015.
[5]王飞,梁清华.基于FPGA的CIC滤波器设计[J].辽宁工业大学学报:自然科学版,2009,29(2):77-79.
[6]姜岩峰,张东,于明.数字接收机中CIC滤波器的设计[J].电子测量与仪器学报,2011,25(8):671-675.
[7]沈至,王宏远.基于半带滤波器的插值结构FPGA优化实现[J].微电子学与计算机,2011,28(2):15-19.
[8]邓晓平,田茂,罗义军,等.通用多通道数字下变频器的优化与实现[J].仪器仪表学报,2011,32(9):1993-1997.
[9]崔琳,杨俊安,刘辉,等.通用数据链并行Laguerre盲均衡算法[J].电子测量与仪器学报,2017,31(2):216-223.
[10]王坤非,王泰华,姚学召,等.基于MATLAB/Simulink FIR数字滤波器设计的不同实现方法研究[J].电子测量技术,2017,31(1):17-20,25.
[11]王南天,钱彦岭,李岳,等.胚胎型在线自修复FIR滤波器研究[J].仪器仪表学报,2012,33(6):1385-1391.
[12]许波,朱熀秋,姬伟,等.基于FIR优化滤波的旋转高频信号注入法及其应用[J].仪器仪表学报,2012,33(3):588-595.
[13]庄信武,王向东,张杰,等.基于数字化矢量伏安法LCR测量仪的设计[J].机电产品开发与创新,2017,30(2):89-91.
[14]吴宇,黄新迪,吴媚,等.基于DSP的高速数据采集处理系统的研究[J].国外电子测量技术,2016,30(5):62-65.
[15]宫琴,金慧君,关添,等.基于USB声卡的便携式耳声发射检测系统的研制[J].仪器仪表学报,2010,31(2):383-389.