1 内容介绍
在设计通信系统数字信号仿真平台的基础上,应用MATLAB软件对二进制数字调制信号进行仿真,具体包括对二进制数字调制信号中的二进制幅度键控信号、二进制频移键控信号和二进制相移键控信号的仿真,并应用GUI的相应控件搭建通信系统数字信号的仿真平台。
2 部分代码
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% AM modulation with GUI %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function varargout = am_mod(varargin)
% Edit the above text to modify the response to help am_mod
% Last Modified by GUIDE v2.5 02-Jun-2022 16:43:51
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @am_mod_OpeningFcn, ...
'gui_OutputFcn', @am_mod_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
% --- Executes just before am_mod is made visible.
function am_mod_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_mod (see VARARGIN)
set(handles.carrier,'Value',0.5);
set(handles.mod,'Value',0.5);
handles.ejex=0:1/1000:.5;
axes(handles.axes1)
y_m=.5*cos(2*pi*25*handles.ejex)+1;
plot(handles.ejex,y_m,'--','Color',[1 0 1]);hold on;
y_c=cos(2*pi*100*handles.ejex);
y_am=y_m.*y_c;
plot(handles.ejex,y_am)
hold off;
title('AM信号');
ylabel('振幅');
xlabel('时间(s)');
axes(handles.axes2)
plotspec(y_am,1/1000);
title('光谱');
%zoom on
% Choose default command line output for am_mod
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = am_mod_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 structure
varargout{1} = handles.output;
% --- Executes on slider movement.
function mod_Callback(hObject, eventdata, handles)
% hObject handle to mod (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,'Value') returns position of slider
% get(hObject,'Min') and get(hObject,'Max') to determine range of slider
f_m=50*get(hObject,'Value');
f_c=200*get(handles.carrier,'Value');
set(handles.fc,'String',f_c);
set(handles.fm,'String',f_m);
axes(handles.axes1)
y_m=.5*cos(2*pi*f_m*handles.ejex)+1;
plot(handles.ejex,y_m,'--','Color',[1 0 0]);hold on;
y_c=cos(2*pi*f_c*handles.ejex);
y_am=y_m.*y_c;
% --- Executes on button press in zoom.
function zoom_Callback(hObject, eventdata, handles)
% hObject handle to zoom (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of zoom
a=get(hObject,'Value');
if a==1
zoom on;
set(handles.zoom,'String','放大');
else
zoom off;
set(handles.zoom,'String','缩小');
end
c
% --- Executes on button press in close.
function close_Callback(hObject, eventdata, handles)
% hObject handle to close (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of close
clc
close all
3 运行结果
