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①Matlab信号处理（进阶版）
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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。
function varargout = xhcl(varargin)
% XHCL MATLAB code for xhcl.fig
% XHCL, by itself, creates a new XHCL or raises the existing
% singleton*.
%
% H = XHCL returns the handle to a new XHCL or the handle to
% the existing singleton*.
%
% XHCL(‘CALLBACK’,hObject,eventData,handles,…) calls the local
% function named CALLBACK in XHCL.M with the given input arguments.
%
% XHCL(‘Property’,‘Value’,…) creates a new XHCL or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before xhcl_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to xhcl_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 xhcl
% Last Modified by GUIDE v2.5 07-Jan-2022 15:44:18
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct(‘gui_Name’, mfilename, …
‘gui_Singleton’, gui_Singleton, …
‘gui_OpeningFcn’, @xhcl_OpeningFcn, …
‘gui_OutputFcn’, @xhcl_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 xhcl is made visible.
function xhcl_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 xhcl (see VARARGIN)
% Choose default command line output for xhcl
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes xhcl wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% — Outputs from this function are returned to the command line.
function varargout = xhcl_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 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)
global sj;
N_m = 10;%随机信号长度
sj= randi([0,1],1,N_m);
t_begin=0;
t_end=1;
mt=0;
t=0:0.01:10;
for i=1:length(sj)
if(sj(i)==1);
mt=mt+1.(t>=t_begin&t<t_end);
else
mt=mt+0.(t>=t_begin&t<t_end);
end
t_begin=t_begin+1;
t_end=t_end+1;
end
axes(handles.axes1);
plot(t,mt);
% — 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)
global sj;
t_begin=0;
t_end=1;
ASK2=0;
t=0:0.01:10;
for i=1:length(sj)
% t=t_begin:0.01:t_end
if(sj(i)==1)
ASK2=ASK2+sin(2pit).(t>=t_begin&t<t_end);
else
ASK2=ASK2+0.(t>=t_begin&t<t_end);
end
t_begin=t_begin+1;
t_end=t_end+1;
end
axes(handles.axes3);
plot(t,ASK2);
% — 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)
global sj;
t_begin=0;
t_end=1;
FSK2=0;
t=0:0.01:10;
for i=1:length(sj)
if(sj(i)==1)
FSK2=FSK2+sin(4pit).(t>=t_begin&t<t_end);
else
FSK2=FSK2+sin(2pit).(t>=t_begin&t<t_end);
end
t_begin=t_begin+1;
t_end=t_end+1;
end
axes(handles.axes3);
plot(t,FSK2);
% — Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global sj;
t_begin=0;
t_end=2;
PSK4=0;
t=0:0.01:10;
for i=1:2:length(sj)
else
if(sj(i+1)==1)
PSK4=PSK4+sin(2pit+0.5pi).(t>=t_begin&t<t_end);
else
PSK4=PSK4+sin(2pit).*(t>=t_begin&t<t_end);
end
end
t_begin=t_begin+2;
t_end=t_end+2;
end
1 matlab版本
2014a
2 参考文献
[1]曾祥龙,梁清梅,索丽敏.运用MATLAB实现对数字信号调制的仿真[J].黑龙江科技信息. 2009,(32)
3 备注
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