第一句子网 > 【数字信号调制】基于matlab GUI数字信号调制系统【含Matlab源码 1030期】

【数字信号调制】基于matlab GUI数字信号调制系统【含Matlab源码 1030期】

时间：2022-06-27 21:54:31

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二、数字信号调制系统简介

二进制数字信号调制原理

数字调制是指用数字基带信号对载波的某些参量进行控制, 使载波的这些参量随基带信号的变化而变化。在通信系统中, 作为载波的正弦波有幅度、频率和相位3个参数, 对应的也就有3种基本的调制方式:调幅、调频和调相。由于数字信号不同与模拟信号的特殊性, 在数字载波通信中, 这3种基本的调制方式分别被称为幅移 (ASK) 、频移键控 (FSK) 和相移键控 (PSK) 。调制信号是二进制数字基带信号时, 这种调制称为二进制数字调制。在二进制数字调制中, 载波的幅度、频率和相位只有两种变化方式。

1 ASK调制

振幅键控是利用载波的幅度变化来传递数字信息, 而其频率和初相位保持不变。二进制幅度键控 (2ASK) 方式是数字调制方式中出现最早也是最简单的一种方法。这种方法最初用于电报系统, 二进制振幅键控常常作为研究其它数字调制方式的基础。2ASK调制信号只有0或1两个电平相乘的, 结果相当于将载频或者关断, 或者接通, 它的实际意义是当调制的数字信号为“1”时, 传输载波;当调制的数字信号为“0”时, 不传输载波。

2ASK信号的一般表达式为:

其中

2 FSK调制

频移键控是利用载波的频率变化来传递数字信息。在2FSK中, 载波的频率随二进制基带信号在f1和f0的两个频率点变化。它的实际意义是当调制的数字信号为“1”或“0”时传输f1或f2频率的载波。

其中ω1=2nf1, ω0=2nf0, θn为频率为f1的载波的初始相位, φn为频率为f0的载波的初始相位。令为Dn的反码, 即

则2FSK信号可表示为:

3 PSK调制

相移键控是利用载波的相位变化来传递数字信息, 而振幅和频率保持不变。PSK调制时, 载波的相位随调制信号状态不同而改变。如果两个频率相同的载波同时开始振荡, 这两个频率同时达到正最大值, 同时达到零值, 同时达到负最大值, 此时它们就处于“同相”状态;如果一个达到正最大值时, 另一个达到负最大值, 则称为“反相”。一般把信号振荡一次 (一周) 作为360度。如果一个波比另一个波相差半个周期, 我们说两个波的相位差180度, 也就是反相。当传输数字信号时, “1”码控制发0度相位, “0”码控制发180度相位。相移键控有很好的抗干扰性, 在有衰落的信道中也能获得很好的效果。

三、部分源代码

function varargout = display_signal(varargin)% DISPLAY_SIGNAL MATLAB code for display_signal.fig%DISPLAY_SIGNAL, by itself, creates a new DISPLAY_SIGNAL or raises the existing%singleton*.%%H = DISPLAY_SIGNAL returns the handle to a new DISPLAY_SIGNAL or the handle to%the existing singleton*.%%DISPLAY_SIGNAL('CALLBACK',hObject,eventData,handles,...) calls the local%function named CALLBACK in DISPLAY_SIGNAL.M with the given input arguments.%%DISPLAY_SIGNAL('Property','Value',...) creates a new DISPLAY_SIGNAL or raises the%existing singleton*. Starting from the left, property value pairs are%applied to the GUI before display_signal_OpeningFcn gets called. An%unrecognized property name or invalid value makes property application%stop. All inputs are passed to display_signal_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 display_signal% Last Modified by GUIDE v2.5 20-Dec- 17:01:23% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name', mfilename, ...'gui_Singleton', gui_Singleton, ...'gui_OpeningFcn', @display_signal_OpeningFcn, ...'gui_OutputFcn', @display_signal_OutputFcn, ...'gui_LayoutFcn', [] , ...'gui_Callback', []);if nargin && ischar(varargin{1})gui_State.gui_Callback = str2func(varargin{1});endif nargout[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});elsegui_mainfcn(gui_State, varargin{:});end% End initialization code - DO NOT EDIT% --- Executes just before display_signal is made visible.function display_signal_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 display_signal (see VARARGIN)% Choose default command line output for display_signalhandles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes display_signal wait for user response (see UIRESUME)% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.function varargout = display_signal_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 on selection change in type.function type_Callback(hObject, eventdata, handles)% hObject handle to type (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 type contents as cell array% contents{get(hObject,'Value')} returns selected item from type% --- Executes during object creation, after setting all properties.function type_CreateFcn(hObject, eventdata, handles)% hObject handle to type (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles empty - handles not created until after all CreateFcns called% Hint: popupmenu 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');endfunction Fb_Callback(hObject, eventdata, handles)% hObject handle to Fb (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 Fb as text% str2double(get(hObject,'String')) returns contents of Fb as a double% --- Executes during object creation, after setting all properties.function Fb_CreateFcn(hObject, eventdata, handles)% hObject handle to Fb (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');endfunction Fc_Callback(hObject, eventdata, handles)% hObject handle to Fc (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 Fc as text% str2double(get(hObject,'String')) returns contents of Fc as a double% --- Executes during object creation, after setting all properties.function Fc_CreateFcn(hObject, eventdata, handles)% hObject handle to Fc (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');endfunction Bit_Callback(hObject, eventdata, handles)% hObject handle to Bit (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 Bit as text% str2double(get(hObject,'String')) returns contents of Bit as a double% --- Executes during object creation, after setting all properties.function Bit_CreateFcn(hObject, eventdata, handles)% hObject handle to Bit (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)tempobj=findobj(gcbf,'tag','type');modu_type=get(tempobj,'value');fc=eval(get(handles.Fc,'String')); %可选参数设置B=str2double(get(handles.Fb,'String'));DisBit=str2double(get(handles.Bit,'String'));switch(modu_type)case 1nper=B/fc; %一个码元中所包含的载波周期数nsamp=128; %过采样率fs=nsamp*B;%采样率Ts=1/fs; %采样周期NumBit=1024; %数据位数%数字基带信号产生Data=randint(1,NumBit);NumSample=NumBit*nsamp; %总采样点数signal=zeros(1,NumSample);start=1;for i=1:NumBitif(Data(i))signal(start:start+nsamp-1)=1;endstart=start+nsamp;endt=0:Ts:Ts*(NumSample-1);ASK_signal=signal.*sin(2*pi*fc*t);