【数字信号调制】基于 AM+FM+DSB+SSB实现信号调制解调含Matlab源码

1 简介

通信信号调制方式的识别是通信信号处理中的一个重要研究课题,是电子对抗的一个重要内容,也是信号分析的一个快速发展领域。其广泛用于信号确认、干扰识别、无线电侦听和信号监测以及软件无线电、卫星通信等领域。自动调制识别的目的就是在未知调制信息内容的前提下,判断出通信信号的调制方式,并估计出相应的调制参数。本文主要通过对通信信号AM,FM,DSB,SSB调制方式的仿真实验。

2 部分代码

function varargout = SSB(varargin)% AM MATLAB code for AM.fig%      AM, by itself, creates a new AM or raises the existing%      singleton*.%%      H = AM returns the handle to a new AM or the handle to%      the existing singleton*.%%      AM('CALLBACK',hObject,eventData,handles,...) calls the local%      function named CALLBACK in AM.M with the given input arguments.%%      AM('Property','Value',...) creates a new AM or raises the%      existing singleton*.  Starting from the left, property value pairs are%      applied to the GUI before AM_OpeningFcn gets called.  An%      unrecognized property name or invalid value makes property application%      stop.  All inputs are passed to AM_OpeningFcn via varargin.%%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one%      instance to run (singleton)".%% See also: GUIDE, GUIDATA, GUIHANDLES% Edit the above text to modify the response to help AM% Last Modified by GUIDE v2.5 12-Jul-2019 17:27:08% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...                   'gui_Singleton',  gui_Singleton, ...                   'gui_OpeningFcn', @AM_OpeningFcn, ...                   'gui_OutputFcn',  @AM_OutputFcn, ...                   'gui_LayoutFcn',  [] , ...                   'gui_Callback',   []);if nargin && ischar(varargin{1})    gui_State.gui_Callback = str2func(varargin{1});end​if nargout    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});else    gui_mainfcn(gui_State, varargin{:});end% End initialization code - DO NOT EDIT​% --- Executes just before AM is made visible.function AM_OpeningFcn(hObject, eventdata, handles, varargin)% This function has no output args, see OutputFcn.% hObject    handle to figure% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% varargin   command line arguments to AM (see VARARGIN)% Choose default command line output for AMhandles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes AM wait for user response (see UIRESUME)% uiwait(handles.figure1);​% --- Outputs from this function are returned to the command line.function varargout = AM_OutputFcn(hObject, eventdata, handles) % varargout  cell array for returning output args (see VARARGOUT);% hObject    handle to figure% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Get default command line output from handles structurevarargout{1} = handles.output;​% --- Executes during object creation, after setting all properties.function axes3_CreateFcn(hObject, eventdata, handles)% hObject    handle to axes3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: place code in OpeningFcn to populate axes3​% --- Executes on button press in pushbutton1.function pushbutton1_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)​% --- Executes during object creation, after setting all properties.function frame1_CreateFcn(hObject, eventdata, handles)% hObject    handle to frame1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called​% --- Executes during object creation, after setting all properties.function text2_CreateFcn(hObject, eventdata, handles)% hObject    handle to text2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called​% --- Executes when entered data in editable cell(s) in uitable2.function uitable2_CellEditCallback(hObject, eventdata, handles)% hObject    handle to uitable2 (see GCBO)% eventdata  structure with the following fields (see MATLAB.UI.CONTROL.TABLE)%  Indices: row and column indices of the cell(s) edited%  PreviousData: previous data for the cell(s) edited%  EditData: string(s) entered by the user%  NewData: EditData or its converted form set on the Data property. Empty if Data was not changed%  Error: error string when failed to convert EditData to appropriate value for Data% handles    structure with handles and user data (see GUIDATA)​% --- Executes on selection change in listbox3.function listbox3_Callback(hObject, eventdata, handles)% hObject    handle to listbox3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: contents = cellstr(get(hObject,'String')) returns listbox3 contents as cell array%        contents{get(hObject,'Value')} returns selected item from listbox3​% --- Executes during object creation, after setting all properties.function listbox3_CreateFcn(hObject, eventdata, handles)% hObject    handle to listbox3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: listbox controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))    set(hObject,'BackgroundColor','white');end​​​function edit1_Callback(hObject, eventdata, handles)% hObject    handle to edit1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit1 as text%        str2double(get(hObject,'String')) returns contents of edit1 as a double​% --- Executes during object creation, after setting all properties.function edit1_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))    set(hObject,'BackgroundColor','white');end​​​function edit2_Callback(hObject, eventdata, handles)% hObject    handle to edit2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit2 as text%        str2double(get(hObject,'String')) returns contents of edit2 as a double​% --- Executes during object creation, after setting all properties.function edit2_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))    set(hObject,'BackgroundColor','white');end​​​function edit3_Callback(hObject, eventdata, handles)% hObject    handle to edit3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit3 as text%        str2double(get(hObject,'String')) returns contents of edit3 as a double​% --- Executes during object creation, after setting all properties.function edit3_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))    set(hObject,'BackgroundColor','white');end​% --- Executes on button press in pushbutton2.function pushbutton2_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)​A=str2num(get(handles.edit1,'String'));  % A=2fm=str2num(get(handles.edit2,'String')); %f=1,1hz基带信号fc=str2num(get(handles.edit3,'String')); %fc=64  hz载波fs=str2num(get(handles.edit4,'String')); %fs=1024;    ​dt=1/fs;  %采样时间间隔T=5;     %信号时长t=0:dt:T;mt=sqrt(A)*cos(2*pi*fm*t);  %信源%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%s_ssb=real(hilbert(mt).*exp(j*2*pi*fc*t));B=fm/2;plot(handles.axes1,t,s_ssb,'b-');  %画出SSB信号波形hold(handles.axes1,'on')plot(handles.axes1,t,mt,'r--');        %表示mt的波形xlabel('t');%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%​[f,sf]=T2F(t,s_ssb);  %单边带信号频谱psf=(abs(sf).^2)/T;   %单边带信号功率谱plot(handles.axes3,f,psf);axis([-2*fc 2*fc 0 max(psf)]);xlabel('f');% --- Executes on button press in pushbutton3.function pushbutton3_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)​close(handles.figure1);% --- Executes during object creation, after setting all properties.function text3_CreateFcn(hObject, eventdata, handles)% hObject    handle to text3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called​​​function edit4_Callback(hObject, eventdata, handles)% hObject    handle to edit4 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit4 as text%        str2double(get(hObject,'String')) returns contents of edit4 as a double​% --- Executes during object creation, after setting all properties.function edit4_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit4 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.%       See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))    set(hObject,'BackgroundColor','white');end​

3 仿真结果

4 参考文献

[1]李光辉. 信号调制方式自动识别的研究[D]. 西华大学.

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