基于MATLAB的数字调制说明书

1洗手洗手2ASK、BEEF2FSK、BEEF2PSK数字调制系统的MATLAB实现及性能分析与比较洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手洗手引言BEEF数字带通传输系统为了进行长距离传输，吃饭克服传输失真，吃饭传输损耗，吃饭同时保证带内特性。洗手必须对数字信号进行载波调制，吃饭将信号频谱搬移到高频段才能在信道中传输，吃饭因而现代通信系统采取数字调制技术。洗手通过数字基带信号对载波某些参量进行控制，吃饭使之随机带信号的变化而变化。洗手根据控制载波参量大的不同，吃饭数字调制有调幅（ASK），吃饭调频FSK，吃饭调相PSK三种基本形式。洗手MATLAB用于仿真，吃饭分析和修改，吃饭还可以应用图形界面功能GUI能为仿真系统生成一个人机交互界面，吃饭便于仿真系统的操作，吃饭因此采用MATLAB对数字系统进行仿真。洗手通过对系统的仿真，吃饭我们可以更加直观的了解数字调制系统的性能（）及影响性能的因素，吃饭从而便于改进系统，吃饭获得更佳的传输性能。洗手洗手关键词BEEF数字系统性能ASKFSKPSKMATLAB仿真洗手洗手洗手洗手2一数字调制与解调原理洗手洗手112ASK洗手（1）2ASK洗手2ASK就是把频率、BEEF相位作为常量，吃饭而把振幅作为变量，吃饭信息比特是通过载波的幅度来传递的。洗手由于调制信号只有0或1两个电平，吃饭相乘的结果相当于将载频或者关断，吃饭或者接通，吃饭它的实际意义是当调制的数字信号“1时，吃饭传输载波；BEEF当调制的数字信号为“0“时，吃饭不传输载波。洗手洗手公式为BEEF洗手洗手洗手洗手122FSK洗手2FSK可以看做是2个不同频率的2ASK的叠加，吃饭其调制与解调方法与2ASK差不多，吃饭主要频率F1和F2，吃饭不同的组合产生所要求的2FSK调制信号。洗手洗手公式如下BEEF洗手洗手,COS2KASKATTS当，当021KF当，当3洗手洗手132PSK洗手2PSK以载波的相位变化为基准，吃饭载波的相位随数字基带序列信号的1或者0而改变，吃饭通常用已经调制完的载波的0或者表示数据1或者0，吃饭每种相位与之一一对应。洗手洗手洗手洗手4二数字调制技术的仿真实现洗手本课程设计需要借助MATLAB的M文件编程功能，吃饭对2ASK2PSK2FSK进行调制与解调的设计，吃饭并绘制出调制与解调后的波形，吃饭误码率的情况分析，吃饭软件仿真可在已有平台上实现。洗手洗手12ASK代码主函数洗手洗手CLOSEALL洗手CLEARALL洗手N16BEEF洗手FC1000000BEEFBITRATE1000000BEEF洗手N50BEEF洗手NOISETIBEEF洗手NOISE10BEEF洗手SIGNALSOURCEN,NBEEF生成二进制代码洗手TRANSMITTEDSIGNALASKMODUSIGNAL,BITRATE,FC,NBEEF调制后信号洗手SIGNAL1GUSSIANTRANSMITTEDSIGNAL,NOISEBEEF加噪声洗手CONFIGUESIGNALDEMOASKSIGNAL1,BITRATE,FC,N,NBEEF洗手洗手SOURCE代码洗手FUNCTIONSENDSIGNALSOURCEN,N洗手SENDSIGNALRANDINT1,N洗手BITBEEF洗手FORI1LENGTHSENDSIGNAL洗手IFSENDSIGNALI0洗手BIT1ZEROS1,NBEEF洗手ELSE洗手BIT1ONES1,NBEEF洗手END洗手BITBIT,BIT1BEEF洗手END洗手FIGURE1洗手PLOT1LENGTHBIT,BIT,TITLETRANSMITTINGOFBINARY,GRIDONBEEF洗手AXIS0,NLENGTHSENDSIGNAL,2,2BEEF洗手END洗手洗手洗手ASKMODU代码洗手FUNCTIONTRANSMITTEDSIGNALASKMODUSIGNAL,BITRATE,FC,NSIGNAL为输入信号，吃饭BITRATE为BIT速率，吃饭FC调制信号频率，吃饭N洗手5SIGNAL00101101BEEF洗手BITRATE1000000BEEF洗手FC1000000BEEF洗手N32BEEF洗手TLINSPACE0,1/BITRATE,NBEEF洗手CSIN2PITFCBEEF洗手TRANSMITTEDSIGNALBEEF洗手FORI1LENGTHSIGNAL洗手TRANSMITTEDSIGNALTRANSMITTEDSIGNAL,SIGNALICBEEF洗手END洗手FIGURE2画调制图洗手PLOT1LENGTHTRANSMITTEDSIGNAL,TRANSMITTEDSIGNALBEEFTITLEMODULATIONOFASKBEEFGRIDONBEEF洗手FIGURE3画频谱实部洗手M0LENGTHTRANSMITTEDSIGNAL1BEEF洗手FFFTTRANSMITTEDSIGNALBEEF洗手PLOTM,ABSREALF,TITLEASK_FREQUENCYDOMAINANALYSISREALBEEF洗手GRIDONBEEF洗手FIGURE4画频谱虚部洗手PLOTM,IMAGFBEEFTITLEASK_FREQUENCYDOMAINANALYSISIMAGBEEF洗手GRIDONBEEF洗手END洗手CHECKRATEPE代码洗手洗手FUNCTIONPEWRONGCHECKRATEPESIGNAL1,SIGNAL2,S洗手RIGHTS0BEEF洗手WRONGS0BEEF洗手FORKI1S2洗手IFSIGNAL1KISIGNAL2KI洗手RIGHTSRIGHTS1BEEF洗手ELSE洗手WRONGSWRONGS1BEEF洗手END洗手END洗手PEWRONGWRONGS/WRONGSRIGHTSBEEF洗手END洗手洗手DEMOASK代码洗手FUNCTIONBITSTREAMDEMOASKRECEIVEDSIGNAL,BITRATE,FC,N,N洗手LOADNUM洗手SIGNAL1RECEIVEDSIGNALBEEF洗手6SIGNAL2ABSSIGNAL1BEEF洗手SIGNAL3FILTERNUM1,1,SIGNAL2BEEFLPF,洗手INFIXLENGTHNUM1/2BEEF洗手BITSTREAMBEEF洗手LLFC/BITRATENBEEF洗手IINLL/2BEEF洗手WHILEI05BEEF洗手IILLBEEF洗手END洗手洗手FIGURE6洗手SUBPLOT3,1,1BEEF接收波形洗手PLOT1LENGTHSIGNAL1,SIGNAL1BEEFTITLEWAVEOFRECEIVINGTERMINALINCLUDINGNOISEBEEFGRIDONBEEF洗手SUBPLOT3,1,2BEEF接收整流后波形洗手PLOT1LENGTHSIGNAL2,SIGNAL2BEEFTITLEWAVEOFCOMMUTATEBEEFGRIDONBEEF洗手SUBPLOT3,1,3BEEF包络检波波形洗手PLOT1LENGTHSIGNAL3,SIGNAL3BEEFTITLEWAVEOFLPFBEEFGRIDONBEEF洗手洗手BITBEEF洗手FORI1LENGTHBITSTREAM洗手IFBITSTREAMI0洗手BIT1ZEROS1,NBEEF洗手ELSE洗手BIT1ONES1,NBEEF洗手END洗手BITBIT,BIT1BEEF洗手END洗手FIGURE7解调后的二进制波形洗手PLOTBIT,TITLEBINARYOFRECEIVINGTERMINAL,GRIDONBEEF洗手AXIS0,NLENGTHBITSTREAM,25,25BEEF洗手END洗手洗手洗手GUSSIAN代码加高斯白噪声洗手FUNCTIONSIGNALGUSSIANTRANSMITTEDSIGNAL,NOISE洗手SIGNALSQRT2TRANSMITTEDSIGNALBEEF洗手SIGNALAWGNSIGNAL,NOISEBEEF洗手FIGURE5洗手PLOT1LENGTHSIGNAL,SIGNALBEEF洗手TITLEWAVEINCLUDINGNOISE,GRIDONBEEF洗手7END洗手/FSK主函数代码洗手CLOSEALL洗手CLEARALL洗手N16BEEF二进制代码长度洗手F118000000BEEF频率1洗手F26000000BEEF频率2洗手BITRATE1000000BEEFBIT速率洗手N50BEEF码元宽度洗手NOISETIBEEF洗手NOISE10BEEF家性噪声大小洗手SIGNALSOURCEN,NBEEF产生二进制代码洗手TRANSMITTEDSIGNALFSKMODUSIGNAL,BITRATE,F1,F2,NBEEF调制洗手SIGNAL1GUSSIANTRANSMITTEDSIGNAL,NOISEBEEF加噪声洗手CONFIGUESIGNALDEMOFSKSIGNAL1,BITRATE,F1,F2,NBEEF解调洗手洗手SOURCE代码二进制信号产生函数洗手FUNCTIONSENDSIGNALSOURCEN,N洗手SENDSIGNALRANDINT1,N洗手BITBEEF洗手FORI1LENGTHSENDSIGNAL洗手IFSENDSIGNALI0洗手BIT1ZEROS1,NBEEF洗手ELSE洗手BIT1ONES1,NBEEF洗手END洗手BITBIT,BIT1BEEF洗手END洗手FIGURE1洗手PLOTBIT,TITLETRANSMITTINGOFBINARY,GRIDONBEEF洗手AXIS0,NLENGTHSENDSIGNAL,25,25BEEF洗手END洗手洗手洗手洗手FSKMODU代码频率调制函数洗手FUNCTIONTRANSMITTEDSIGNALFSKMODUSIGNAL,BITRATE,F1,F2,N洗手TLINSPACE0,1/BITRATE,NBEEF洗手C1SIN2PITF1BEEF调制信号1洗手8C2SIN2PITF2BEEF调制信号2洗手TRANSMITTEDSIGNALBEEF洗手FORI1LENGTHSIGNAL调制洗手IFSIGNALI1洗手TRANSMITTEDSIGNALTRANSMITTEDSIGNAL,C1BEEF洗手ELSE洗手TRANSMITTEDSIGNALTRANSMITTEDSIGNAL,C2BEEF洗手END洗手END洗手FIGURE2画调制后波形图洗手洗手PLOT1LENGTHTRANSMITTEDSIGNAL,TRANSMITTEDSIGNALBEEFTITLEMODULATIONOFFSKBEEFGRIDONBEEF洗手FIGURE3画调制后频谱图洗手M0LENGTHTRANSMITTEDSIGNAL1BEEF洗手FFFTTRANSMITTEDSIGNALBEEF洗手PLOTM,ABSREALF,TITLEASK_FREQUENCYDOMAINANALYSISREALBEEF洗手GRIDONBEEF洗手END洗手洗手DEMOFSK代码洗手FUNCTIONBITSTREAMDEMOFSKRECEIVEDSIGNAL,BITRATE,F1,F2,N洗手LOADNUM洗手SIGNAL1RECEIVEDSIGNALBEEF洗手SIGNAL2FILTERGAOTONG,1,SIGNAL1BEEF通过HPF，吃饭得到高通分量洗手SIGNAL3ABSSIGNAL2BEEF整流洗手SIGNAL3FILTERLOWPASS,1,SIGNAL3BEEF通过低通，吃饭形成包络洗手BITSTREAMBEEF洗手IN1FIXLENGTHLOWPASS/2FIXLENGTHGAOTONG/2BEEF延迟时间洗手BITSTREAM1BEEF洗手LLNBEEF每个BIT的抽样点数洗手IIN1LL/2BEEF洗手WHILEI05BEEF洗手IILLBEEF洗手END洗手BITSTREAM1洗手FIGURE5洗手SUBPLOT3,1,1BEEF洗手PLOT1LENGTHSIGNAL1,SIGNAL1BEEFTITLEWAVEOFRECEIVINGTERMINALINCLUDINGNOISEBEEFGRIDONBEEF洗手SUBPLOT3,1,2BEEF洗手9PLOT1LENGTHSIGNAL2,SIGNAL2BEEFTITLEAFTERPASSINGHPFBEEFGRIDONBEEF洗手SUBPLOT3,1,3BEEF洗手PLOT1LENGTHSIGNAL3,SIGNAL3BEEFTITLEAFTERPASSINGLPFBEEFGRIDONBEEF洗手洗手SIGNAL4FILTERDAITONG,1,SIGNAL1BEEF通过BPF得到低频分量洗手SIGNAL5ABSSIGNAL4BEEF整流洗手SIGNAL5FILTERLOWPASS,1,SIGNAL5BEEF通过LPF，吃饭形成包络洗手IN2FIXLENGTHLOWPASS/2FIXLENGTHDAITONG/2BEEF延迟时间洗手BITSTREAM2BEEF洗手LLNBEEF每个BIT的的抽样点数洗手IIN2LL/2BEEF洗手WHILEI05BEEF洗手IILLBEEF洗手END洗手BITSTREAM2洗手FIGURE6洗手SUBPLOT3,1,1BEEF洗手PLOT1LENGTHSIGNAL1,SIGNAL1BEEFTITLEWAVEOFRECEIVINGTERMINALINCLUDINGNOISEBEEFGRIDONBEEF洗手SUBPLOT3,1,2BEEF洗手PLOT1LENGTHSIGNAL4,SIGNAL4BEEFTITLEAFTERPASSINGBPFBEEFGRIDONBEEF洗手SUBPLOT3,1,3BEEF洗手PLOT1LENGTHSIGNAL5,SIGNAL5BEEFTITLEAFTERPASSINGLPFBEEFGRIDONBEEF洗手洗手FORI1MINLENGTHBITSTREAM1,LENGTHBITSTREAM2判决洗手IFBITSTREAM1IBITSTREAM2I洗手BITSTREAMI1BEEF洗手ELSE洗手BITSTREAMI0BEEF洗手END洗手END洗手BITSTREAM洗手洗手BITBEEF接收端波形洗手FORI1LENGTHBITSTREAM洗手IFBITSTREAMI0洗手BIT1ZEROS1,NBEEF洗手ELSE洗手BIT1ONES1,NBEEF洗手10END洗手BITBIT,BIT1BEEF洗手END洗手FIGURE7洗手PLOTBIT,TITLEBINARYOFRECEIVINGTERMINAL,GRIDONBEEF洗手AXIS0,NLENGTHBITSTREAM,25,25BEEF洗手END洗手洗手CHECKRATEPE代码洗手FUNCTIONPEWRONGCHECKRATEPESIGNAL1,SIGNAL2,S洗手RIGHTS0BEEF洗手WRONGS0BEEF洗手FORKI1S2洗手IFSIGNAL1KISIGNAL2KI洗手RIGHTSRIGHTS1BEEF洗手ELSE洗手WRONGSWRONGS1BEEF洗手END洗手END洗手PEWRONGWRONGS/WRONGSRIGHTSBEEF洗手END洗手洗手GUSSIAN代码洗手FUNCTIONSIGNALGUSSIANTRANSMITTEDSIGNAL,NOISE洗手SIGNALSQRT2TRANSMITTEDSIGNALBEEF洗手SIGNALAWGNSIGNAL,NOISEBEEF洗手FIGURE4洗手PLOT1LENGTHSIGNAL,SIGNAL,TITLEADDINGNOISEBEEF洗手GRIDONBEEF洗手END洗手2PSK主函数代码洗手CLOSEALL洗手CLEARALL洗手N16BEEF二进制码长洗手FC1000000BEEF载波频率洗手BITRATE1000000BEEF信息频率洗手N50BEEF码宽洗手NOISE10BEEF信道加性噪声大小洗手SIGNALSOURCEN,NBEEF生成二进制代码洗手TRANSMITTEDSIGNALBPSKMODUSIGNAL,BITRATE,FC,NBEEF对信号进行调制并进行频洗手谱分析洗手11SIGNAL1GUSSIANTRANSMITTEDSIGNAL,NOISE加信道噪声洗手CONFIGUESIGNALDEMOBPSKSIGNAL1,BITRATE,FC,N,NBEEF信号解调洗手洗手SOURCE代码洗手FUNCTIONSENDSIGNALSOURCEN,N洗手SENDSIGNALRANDINT1,N洗手BITBEEF洗手FORI1LENGTHSENDSIGNAL洗手IFSENDSIGNALI0洗手BIT1ZEROS1,NBEEF洗手ELSE洗手BIT1ONES1,NBEEF洗手END洗手BITBIT,BIT1BEEF洗手END洗手FIGURE1洗手PLOTBIT,TITLETRANSMITTINGOFBINARY,GRIDONBEEF洗手AXIS0,NLENGTHSENDSIGNAL,25,25BEEF洗手END洗手洗手洗手洗手洗手BPSKMODU代码洗手FUNCTIONTRANSMITTEDSIGNALBPSKMODUSIGNAL,BITRATE,FC,N洗手TLINSPACE0,1/BITRATE,NBEEF洗手C1SIN2PITFCBEEF洗手C2SIN2PITFCPIBEEF洗手TRANSMITTEDSIGNALBEEF洗手FORI1LENGTHSIGNAL洗手IFSIGNALI1洗手TRANSMITTEDSIGNALTRANSMITTEDSIGNAL,C1BEEF洗手ELSE洗手TRANSMITTEDSIGNALTRANSMITTEDSIGNAL,C2BEEF洗手END洗手END洗手FIGURE2画调制图洗手PLOT1LENGTHTRANSMITTEDSIGNAL,TRANSMITTEDSIGNALBEEFTITLEMODULATIONOFBPSKBEEFGRIDONBEEF洗手FIGURE3画频谱图洗手M0LENGTHTRANSMITTEDSIGNAL1BEEF洗手FFFTTRANSMITTEDSIGNALBEEF洗手12PLOTM,ABSREALF,TITLEBPSK_FREQUENCYDOMAINANALYSISREALBEEF洗手GRIDONBEEF洗手END洗手洗手洗手CHECKRATEPE代码洗手FUNCTIONPEWRONGCHECKRATEPESIGNAL1,SIGNAL2,S洗手RIGHTS0BEEF洗手WRONGS0BEEF洗手FORKI1S2洗手IFSIGNAL1KISIGNAL2KI洗手RIGHTSRIGHTS1BEEF洗手ELSE洗手WRONGSWRONGS1BEEF洗手END洗手END洗手PEWRONGWRONGS/WRONGSRIGHTSBEEF洗手END洗手洗手DEMOBPSK代码洗手FUNCTIONBITSTREAMDEMOBPSKRECEIVEDSIGNAL,BITRATE,FC,N,N洗手LOADNUM读取NUM存储的低通滤波用的数据洗手SIGNAL1RECEIVEDSIGNALBEEF洗手TLINSPACE0,1/BITRATE,NBEEF洗手CSIN2PITFCBEEF洗手SIGNALBEEF洗手FORI1N洗手SIGNALSIGNAL,CBEEF洗手END洗手SIGNAL2SIGNAL1SIGNALBEEF乘同频同相SIN洗手SIGNAL3FILTERNUM1,1,SIGNAL2BEEFLPF,包络检波3洗手INFIXLENGTHNUM1/2BEEF延迟时间洗手BITSTREAMBEEF洗手LLFC/BITRATENBEEF洗手IINLL/2BEEF洗手WHILEI0BEEF洗手IILLBEEF洗手END洗手洗手FIGURE5洗手SUBPLOT3,1,1BEEF画接收的包含噪声的波形洗手13PLOT1LENGTHSIGNAL1,SIGNAL1BEEFTITLEWAVEOFRECEIVINGTERMINALINCLUDINGNOISEBEEFGRIDONBEEF洗手SUBPLOT3,1,2BEEF相干解调波形洗手PLOT1LENGTHSIGNAL2,SIGNAL2BEEFTITLEAFTERMULTIPLINGSINFUCTIONBEEFGRIDONBEEF洗手SUBPLOT3,1,3BEEF包络检波波形洗手PLOT1LENGTHSIGNAL3,SIGNAL3BEEFTITLEWAVEOFLPFBEEFGRIDONBEEF洗手洗手BITBEEF洗手FORI1LENGTHBITSTREAM洗手IFBITSTREAMI0洗手BIT1ZEROS1,NBEEF洗手ELSE洗手BIT1ONES1,NBEEF洗手END洗手BITBIT,BIT1BEEF洗手END洗手FIGURE6二进制接收信号波形洗手PLOTBITBEEFTITLEBINARYOFRECEIVINGTERMINALBEEFGRIDONBEEF洗手AXIS0,NLENGTHBITSTREAM,25,25BEEF洗手END洗手GUSSIAN代码洗手FUNCTIONSIGNALGUSSIANTRANSMITTEDSIGNAL,NOISE洗手SIGNALSQRT2TRANSMITTEDSIGNALBEEF洗手SIGNALAWGNSIGNAL,NOISEBEEF洗手FIGURE4洗手PLOT1LENGTHSIGNAL,SIGNAL,GRIDONBEEF洗手TITLEADDINGNOISE洗手END洗手洗手三种调制方式的性能比较洗手LOADPERATEBEEF洗手LOADPERATEPBEEF洗手补偿误差洗手FPEASK151E3BEEF洗手FPEFSK91E3BEEF洗手FPEPSK240002BEEF洗手FPEPSK261E3BEEF洗手FIGURE1洗手SEMILOGY6LENGTHFPEASK7,FPEASK,6LENGTHFPEFSK7,FPEFSK,30LENGTHFPEPSK31,FPEPSK,GRIDONBEEF洗手TITLEANALYSISOFBITERRORRATEBEEF洗手14LEGENDASK,FSK,PSKBEEF洗手XLABELR/DBBEEF洗手YLABELPEBEEF洗手洗手FIGURE2洗手SEMILOGY6LENGTHFPEFSK7,FPEASKBEEFGRIDONBEEF洗手TITLEBITERRORRATEOFASKBEEF洗手XLABELR/DBBEEF洗手YLABELPEASKBEEF洗手FIGURE3洗手SEMILOGY6LENGTHFPEFSK7,FPEFSKBEEFGRIDONBEEF洗手TITLEBITERRORRATEOFFSKBEEF洗手XLABELR/DBBEEF洗手YLABELPEFSKBEEF洗手FIGURE4洗手SEMILOGY16LENGTHFPEPSK17,FPEPSKBEEFGRIDONBEEF洗手TITLEBITERRORRATEOFPSKBEEF洗手AXIS16,10,1E3,1BEEF洗手XLABELR/DBBEEF洗手YLABELPEPSKBEEF洗手洗手洗手洗手三程序与调制解调波形洗手312ASK波形洗手1随机信号产生洗手15洗手洗手2ASK信号调制洗手洗手3信号噪声附加洗手16洗手4接受信号解调洗手洗手5解调出的基带信号洗手17洗手洗手32FSK洗手1随机信号产生洗手洗手2FSK信号调制洗手18洗手3信号噪