为FPGA实现数字下变频器

傅氏国际= 122.88 e6;%,DDC输入的采样率FsOut = 1.92 e6;%,DDC产出的采样率Fc = 32 e6;%载波频率成就= 540年e3;%通带频率,相当于36 x15khz LTE副载波Fstop = 700年e3;%阻带频率美联社= 0.1;%通带纹波Ast = 60;%阻带衰减

cicParams。DecimationFactor = 8;cicParams。DifferentialDelay = 1;cicParams。NumSections = 3;cicParams。FsOut =国际/ cicParams.DecimationFactor;cicFilt = dsp.CICDecimator (cicParams.DecimationFactor,…cicParams.DifferentialDelay cicParams.NumSections)% #好< * NOPTS >cicGain =获得(cicFilt)

cicGainCorr = dsp.FIRFilter (“分子”1 / cicGain)

ddcPlots。cicDecim = fvtool (…cicFilt,…dsp.FilterCascade (cicFilt cicGainCorr),…“Fs”,国际,国际);传奇(ddcPlots.cicDecim…“中投没有校正”,…“中投与增益校正”);

compParams。R = 2;%中投公司赔偿大量毁灭的因素compParams。成就= Fstop;% CIC补偿通频带的频率compParams。FsOut = cicParams.FsOut / compParams.R;%的新采样率compParams。Fstop= compParams.FsOut - Fstop;% CIC补偿阻带频率compParams。美联社=美联社;%整体滤波器通带波纹一样compParams。Ast = Ast;%整体滤波器阻带衰减一样compSpec = fdesign.decimator (compParams.R,“ciccomp”,…cicParams.DifferentialDelay,…cicParams.NumSections,…cicParams.DecimationFactor,…“Fp,置,美联社,Ast”,…compParams.Fpass、compParams.Fstop compParams.Ap compParams.Ast,…cicParams.FsOut);compFilt =设计(compSpec,“SystemObject”,真正的)

ddcPlots。cicComp = fvtool (…dsp.FilterCascade (cicFilt cicGainCorr compFilt),…“Fs”傅氏国际,“传奇”,“关闭”);

hbParams。FsOut = compParams.FsOut / 2;hbParams。TransitionWidth = hbParams。FsOut - 2 * Fstop;hbParams。StopbandAttenuation = Ast;hbSpec = fdesign.decimator (2“halfband”,…“Tw, Ast”,…hbParams.TransitionWidth,…hbParams.StopbandAttenuation,…compParams.FsOut);hbFilt =设计(hbSpec,“SystemObject”,真正的)

ddcPlots。halfbandFIR = fvtool (…dsp.FilterCascade (cicFilt cicGainCorr、compFilt hbFilt),…“Fs”傅氏国际,“传奇”,“关闭”);

finalSpec = fdesign.decimator (2低通滤波器的,…“Fp,置,美联社,Ast”成就,Fstop,美联社,Ast + 3, hbParams.FsOut);finalFilt =设计(finalSpec,“equiripple”,“SystemObject”,真正的)

ddcFilterChain = dsp.FilterCascade (cicFilt cicGainCorr、compFilt hbFilt, finalFilt);ddcPlots。overallResponse = fvtool (ddcFilterChain,“Fs”傅氏国际,“传奇”,“关闭”);

cicFilt。FixedPointDataType =“最低部分单词长度”;cicFilt。OutputWordLength = 18;

%中投获得校正cicGainCorr。FullPrecisionOverride = false;cicGainCorr。CoefficientsDataType =“自定义”;cicGainCorr。CustomCoefficientsDataType = numerictype (fi (cicGainCorr.Numerator 1 16));cicGainCorr。OutputDataType =“自定义”;cicGainCorr。CustomOutputDataType = numerictype (1、18、16);%中投下垂补偿compFilt。FullPrecisionOverride = false;compFilt。CoefficientsDataType =“自定义”;compFilt。CustomCoefficientsDataType = numerictype(15)[], 16日;compFilt。ProductDataType =“充分精确”;compFilt。AccumulatorDataType =“充分精确”;compFilt。OutputDataType =“自定义”;compFilt。CustomOutputDataType = numerictype ([]、18、16);% HalfbandhbFilt。FullPrecisionOverride = false;hbFilt。CoefficientsDataType =“自定义”;hbFilt。CustomCoefficientsDataType = numerictype(15)[], 16日;hbFilt。ProductDataType =“充分精确”;hbFilt。AccumulatorDataType =“充分精确”;hbFilt。OutputDataType =“自定义”;hbFilt。CustomOutputDataType = numerictype ([]、18、16);%冷杉finalFilt。FullPrecisionOverride = false;finalFilt。CoefficientsDataType =“自定义”;finalFilt。CustomCoefficientsDataType = numerictype(15)[], 16日;finalFilt。ProductDataType =“充分精确”;finalFilt。AccumulatorDataType =“充分精确”;finalFilt。OutputDataType =“自定义”;finalFilt。CustomOutputDataType = numerictype ([]、18、16);

ddcPlots。quantizedFIR = fvtool (finalFilt,…“Fs”hbParams.FsOut,“算术”,“固定”);

ddcFilterChain = dsp.FilterCascade (cicFilt,…cicGainCorr、compFilt hbFilt finalFilt);ddcPlots。quantizedDDCResponse = fvtool (ddcFilterChain,…“Fs”傅氏国际,“算术”,“固定”);传奇(ddcPlots.quantizedDDCResponse…“如DDC过滤器链”);

以区域。Fd = 1;以区域。AccWL = nextpow2(国际/ nco.Fd) + 1;SFDR = 84;以区域。QuantAccWL =装天花板((SFDR-12) / 6);以区域。PhaseInc =圆((fc * 2 ^ nco.AccWL) /国际);以区域。NumDitherBits = nco.AccWL-nco.QuantAccWL;

ddcIn = 0;% #好< NASGU >

FrameSize = 4;

modelName =“DDCforLTEHDL”;open_system (modelName);set_param (modelName“SimulationCommand”,“更新”);set_param (modelName“开放”,“上”);

set_param ([modelName' / HDL_DDC '),“开放”,“上”);

%初始化随机种子之前执行任何模拟。rng (0);% 40 kHz生成一个测试的语气,调制到载波上。ddcIn = DDCTestUtils.GenerateTestTone (40 e3, Fc);%的测试信号解调浮点监护系统。ddcOut = DDCTestUtils.DownConvert (ddcIn、国际俱乐部、ddcFilterChain);释放(ddcFilterChain);%解调测试信号通过运行仿真软件模型。万博1manbetx= sim (modelName);NCO %测量SFDR,浮点DDC输出,和定点%,DDC输出。结果。sfdrNCO = sfdr(真正的(out.ncoOut),国际);结果。sfdrFloatDDC = sfdr(真正的(ddcOut), FsOut);结果。sfdrFixedDDC = sfdr(真正的(out.ddcFixedOut), FsOut);disp (“SFDR测量”);disp ([“浮点,DDC SFDR:“num2str (results.sfdrFloatDDC)“数据库”]);disp ([“定点NCO SFDR:”num2str (results.sfdrNCO)“数据库”]);disp ([“优化的定点,DDC SFDR:”num2str (results.sfdrFixedDDC)“数据库”]);流(换行符);%绘制SFDR NCO和定点监护系统的输出。ddcPlots。以区域OutSDFR = figure; sfdr(real(out.ncoOut),FsIn); ddcPlots.OptddcOutSFDR = figure; sfdr(real(out.ddcFixedOut),FsOut);

rng (0);%执行这个测试只有如果你有LTE工具箱的产品。如果许可证(“测试”,“LTE_Toolbox”)%生成调制LTE测试信号通过使用LTE工具箱函数。[ddcIn, sigInfo] = DDCTestUtils.GenerateLTETestSignal (Fc);%降频转换器信号与浮点监护系统。ddcOut = DDCTestUtils.DownConvert (ddcIn、国际俱乐部、ddcFilterChain);释放(ddcFilterChain);%降频转换器信号与仿真软件模型,然后测量和绘制万博1manbetx%的维生素与浮点和定点的结果。用零填充的输入%代表传播延迟和返回完整的结果。ddcIn = [ddcIn; 0 (2480 * FrameSize, 1)];= sim (modelName);结果。evmFloat = DDCTestUtils.MeasureEVM (sigInfo ddcOut);结果。evmFixed = DDCTestUtils.MeasureEVM (sigInfo out.ddcFixedOut(1:长度(ddcOut)));disp (LTE误差向量幅度(维生素)测量的);disp ([挣值管理的浮点,DDC RMS都:“num2str (results.evmFloat.RMS * 100, 3)“%”]);disp ([挣值管理的浮点,DDC峰值都:“num2str (results.evmFloat.Peak * 100, 3)“%”]);disp ([的定点,DDC RMS维生素:num2str (results.evmFixed.RMS * 100, 3)“%”]);disp ([挣值管理的定点,DDC峰值都:“num2str (results.evmFixed.Peak * 100, 3)“%”]);流(换行符);结束

T =表(…分类({附近地区的;“LUTRAM”;“FF”;“布莱姆。”;“DSP”}),…分类({“4341”;“383”;“8248”;“2.0”;“36”}),…“VariableNames”,{“资源”,“使用”})