试验交换机基本配置试验

1、实验十九通信原理综合实验-BPSK调制解调【设计要求】设计2PSK调制解调器设计环境：显示器设计指标：BPSK调制载波由信号 发生器参数，数据信号由微机参数，两个信号不同步 载波信号幅度Vpp = 2V，标称频率100Hz,误差一 10%PLL入锁频率范围_10Hz跟踪范围 _20Hz数据信号速率5 baud, 0/1方波。【系统设计】1. 总体设计根据系统设计指标，设计系统框图如下：调制系统由乘法器构成。硬件信号发生器产生的载波信号与本地信号发生 器产生的调制信号构成。SBpsK(t) =Am(t)cos(2 二 fct 入)=Acoscos(2二 fct)(t)%)其中：fc为载波频率，入

2、为载波初始相位。解调系统由载波恢复电路和相干解调器构成。由于BPSK信号中没有载波频率分量，因此，需要进行非线性变换为进行系统性能比拟，设计一非同步解调参考解调电路。2. 载波恢复模块设计载波恢复模块由平方倍频器与分频 PLL构成平方器输出为：s(t)二 A2m2(t)cos2(2二 fct 如A221 cos(4二 fct 2=0)在实际应用中A为缓变量，因此，要滤除直流分量不能用常量减法，只能用高通滤波器，其传递函数为：H(s)二PLL电路构成如下:环路中参加倍频器，锁相输出频率为 1/2输入频率。为使环路得到较好的稳定性，环路滤波器采用一阶滤波器H(j 戶根据系统入锁频差要求-n大约在1

3、020HZ之间。(选10Hz)由于BPSK信号的相位为阶跃函数，为保证跟踪锁相环开环增益在保证环路稳 定的条件下取较大值，开环增益中起主要作用的VCO增益取5000HZ/V。3. 解调电路设计解调电路由乘法器与低通滤波器构成。为保证低频数字信号的波形，采用通带平坦型2阶BUTTER低通滤波器，使通带内的相移较小。15791H (s)2 截止频率20Hzs2+178s+157914. 采集卡驱动程序设计MATLAB用S函数编写硬件接口， S函数在MATLAB中的调用过程为Simulink Engine|八：m&checkpaTBmetrurwradlsmtlnpLltp OMH Wi d

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8、口定义与要求，驱动程序由以下程序构成test_matlab.cpp :/* $Revisio n: 1.3 $ */ Automatically gen erated by MATLAB Project Wizard versio n 1.0 /* Based on sfuntmpl_basic.c: Basic C template for a level 2 S-function.*| See matlabroot/simuli nk/sre/sfu ntmpl_doc.c for a more detailed template |* Copyright 1990-2000 The Ma

9、thWorks, Inc.* $Revision: 1.3 $*/#include "iostream.h"#include <math.h>#include <windows.h>#include "P1202DRV .H"P1202DRV MyDrv;#ifdef _cplusplusextern "C" / use the C fcn-call standard for all functions#endif/ defined within this scope/* You must specify th

10、e S_FUNCTION_NAME as the name of your S-function* (i.e. replace sfuntmpl_basic with the name of your S-function).*/#define S_FUNCTION_LEVEL 2#define S_FUNCTION_NAME test_matlab/* Need to include simstruc.h for the definition of the SimStruct and* its associated macro definitions.*/#include "sim

11、struc.h"/* S-function methods */ Error handling* * You should use the following technique to report errors encountered within* an S-function:*ssSetErrorStatus(S,"Error encountered due to .");*return;* Note that the 2nd argument to ssSetErrorStatus must be persistent memory.* It cannot

12、 be a local variable. For example the following will cause* unpredictable errors:*mdlOutputs()* char msg256; ILLEGAL: to fix use "static char msg256;"* sprintf(msg,"Error due to %s", string);*ssSetErrorStatus(S,msg);*return;* * See matlabroot/simulink/src/sfuntmpl_doc.c for more

13、details.*/* Abstract:*The sizes information is used by Simulink to determine the S-function*block's characteristics (number of inputs, outputs, states, etc.).*/static void mdlInitializeSizes(SimStruct *S)/* See sfuntmpl_doc.c for more details on the macros below */ ssSetNumSFcnParams(S, 0); /* N

14、umber of expected parameters */if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S) /* Return if number of expected != number of actual parameters */return;ssSetNumContStates(S, 0);ssSetNumDiscStates(S, 0);if (!ssSetNumInputPorts(S, 0) return;/ssSetInputPortWidth(S, 0, 1);/ssSetInputPortRequiredCont

15、iguous(S, 0, true); /*direct input signal access*/ssSetInputPortDirectFeedThrough(S, 0, 1);if (!ssSetNumOutputPorts(S, 1) return;ssSetOutputPortWidth(S, 0, 1);ssSetNumSampleTimes(S, 2);ssSetNumRWork(S, 0);ssSetNumIWork(S, 0);ssSetNumPWork(S, 1);ssSetNumModes(S, 0);ssSetNumNonsampledZCs(S, 0);/ssSetO

16、ptions(S, 0);/ssSetOptions(S, SS_OPTION_ALLOW_CONSTANT_PORT_SAMPLE_TIME);/* Function: mdlInitializeSampleTimes* Abstract:*This function is used to specify the sample time(s) for your*S-function. You must register the same number of sample times as* specified in ssSetNumSampleTimes.*/static void mdlI

17、nitializeSampleTimes(SimStruct *S)ssSetSampleTime(S, 0, CONTINUOUS_SAMPLE_TIME);ssSetOffsetTime(S, 0, 0.0);ssSetSampleTime(S, 1, 1.0/SAMPLERATE);ssSetOffsetTime(S, 1, 0.0);/ssSetOutputPortSampleTime(S, 0, 0.01);/ssSetOutputPortOffsetTime(S, 0, 0);/#define MDL_INITIALIZE_CONDITIONS/ Abstract:*This fu

18、nction is called once at start of model execution. If you*have states that should be initialized once, this is the place*to do it. Change to #undef to remove function */#undef MDL_INITIALIZE_CONDITIONS#if defined(MDL_INITIALIZE_CONDITIONS)/* Function: mdlInitializeConditions* Abstract:*In this funct

19、ion, you should initialize the continuous and discrete*states for your S-function block. The initial states are placed*in the state vector, ssGetContStates(S) or ssGetRealDiscStates(S).*You can also perform any other initialization activities that your*S-function may require. Note, this routine will

20、 be called at the* start of simulation and if it is present in an enabled subsystem*configured to reset states, it will be call when the enabled subsystem*restarts execution to reset the states.*/static void mdlInitializeConditions(SimStruct *S)#endif /* MDL_INITIALIZE_CONDITIONS */#define MDL_START

21、/* Change to #undef to remove function */#if defined(MDL_START)/* Function: mdlStartstatic void mdlStart(SimStruct *S)/* for(i=0;i<1024;i+)wavei=sin(i*2*3.1416/102.4);*/P1202DRV *MyDrv = new P1202DRV;if(MyDrv=NULL)ssSetErrorStatus(S, "error message");return;ssGetPWork(S)0=(void *)MyDrv;

22、if(MyDrv->Init()ssSetErrorStatus(S, "error message");return;MyDrv->StartScan();#endif /* MDL_START */mdlOutputs/* Function:* Abstract:*In this function, you compute the outputs of your S-functionblock. Generally outputs are placed in the output vector, ssGetY(S).*/static void mdlOutp

23、uts(SimStruct Abstract:*This function is called once for every major integration time step.*Discrete states are typically updated here, but this function is useful*for performing any tasks that should only take place once per* integration step.S, int_T tid)/const real_T *u = (const real_T*) ssGetInp

24、utPortSignal(S,0); real_T*y = ssGetOutputPortRealSignal(S,0);real_Tval,Sampletime;P1202DRV *MyDrv = (P1202DRV *)ssGetPWork(S)0;Sampletime=ssGetT(S);val=MyDrv->Read(Sampletime);if(val>100.0)ssSetErrorStatus(S, "Data overflow!");y0=val;#define MDL_UPDATE/* Change to #undef to remove fu

25、nction */#undef MDL_UPDATE#if defined(MDL_UPDATE)mdlUpdate/* Function:static void mdlUpdate(SimStruct Abstract:In this function, you should perform any actions that are necessary at the termination of a simulation.For example, if memory wasallocated in mdlStart, this is the place to free it.S, int_T

26、 tid)#endif /* MDL_UPDATE */#define MDL_DERIVATIVES/* Change to #undef to remove function */#undef MDL_DERIVATIVES#if defined(MDL_DERIVATIVES)mdlDerivatives/* Function:* Abstract:*In this function, you compute the S-function block's derivatives.*The derivatives are placed in the derivative vecto

27、r, ssGetdX(S).*/static void mdlDerivatives(SimStruct *S)#endif /* MDL_DERIVATIVES */*Function:mdlTerminatestatic void mdlTerminate(SimStruct *S)P1202DRV *MyDrv = (P1202DRV *)ssGetPWork(S)0;if(MyDrv=NULL)return;MyDrv->Stop();MyDrv->Close();delete MyDrv;return;/* See sfuntmpl_doc.c for the optio

28、nal S-function methods */* Required S-function trailer */#ifdef MATLAB_MEX_FILE /* Is this file being compiled as a MEX-file? */#include "simulink.c"/* MEX-file interface mechanism */#else/* Code generation registration function */#include "cg_sfun.h" #endif#ifdef _cplusplus / en

29、d of extern "C" scope#endifP1202DRV.H:/ P1202DRV .h: interface for the P1202DRV class./#if !defined(AFX_P1202DRV_H_455B5152_0FD1_4D8F_9BD3_9DFD0C69E6E7_INC LUDED_)#defineAFX_P1202DRV_H_455B5152_0FD1_4D8F_9BD3_9DFD0C69E6E7_INCLUDED_#if _MSC_VER > 1000#pragma once#endif / _MSC_VER > 10

30、00#define BUFFLEN 1000#define NUMCHAN 1#define INITFLAG 0X1#define ACTIVEFLAG 0X2#define SCANFLAG 0X4#define READFLAG 0x8#define SAMPLERATE 4000#include <math.h>#ifdef _cplusplusextern "C" / use the C fcn-call standard for all functions#endif / defined within this scope#define S_FUNC

31、TION_LEVEL 2#define S_FUNCTION_NAME test_matlab#include "simstruc.h"#ifdef _cplusplus / end of extern "C" scope#endifclass P1202DRVint initflag,buffindex,readcount;int ErrorFlag;time_T Ts,StartTime,EndTime;DWORD dwP1,dwP2;WORD wChannelStatus32,wChannelConfig32,wStatus;WORD wCard0

32、Buf0BUFFLEN*32,wCard0Buf1BUFFLEN*32; public:P1202DRV();virtual P1202DRV();public:int Init();int Close();int StartScan();double Read(time_T SampleTime);int Stop();WORD CardRead();/ !defined(AFX_P1202DRV_H_455B5152_0FD1_4D8F_9BD3_9DFD0C69E6E7_INCL UDED_)P1202DRV.C:/ P1202DRV .cpp: implementation of th

33、e P1202DRV class./#include <windows.h>#include <stdlib.h>#include <stdio.h>#include <conio.h>#include "p1202.h"#include "P1202DRV .h"/ Construction/Destruction/P1202DRV:P1202DRV()P1202DRV:P1202DRV()P1202DRV:Init()int i;WORD wTotalBoard,wInitialCode;ErrorFl

34、ag=0;for(i=0; i<32; i+)wChannelStatusi=0;wChannelConfigi=0;/wChannelStatus0=1; / Add Ch:0 to be scanfor(i=0;i<NUMCHAN;i+)wChannelStatusi=1;buffindex=0;initflag=0;readcount=0;wInitialCode=P1202_DriverInit(&wTotalBoard);if( wInitialCode!=NoError )ErrorFlag=1;return 1;P1202_ActiveBoard( 0 );Ts=1.0/SAMPLERATE;StartTime=EndTime=0;initflag=INITFLAG|ACTIVEFLAG;return 0;P1202DRV:Close()P1202_DriverClose();initflag=0;return 0;P1202DRV:StartScan()if(ErrorFlag)return ErrorFlag;if(initflag&ACTIVEFLAG)=0)return -1;P1202_Card0_StartScan(WOR