own.m

对于移动通信系统主要有两类衰落：大规模衰落和小规模衰落。大规模衰落表示由于大范围内移动而引起的平均信号能量的减少或路径损耗。而小规模衰落则表现为两种机制：信号的时延扩展和信道的时变特性。对于无线应用

function varargout = untitled(varargin)
% UNTITLED M-file for untitled.fig
%      UNTITLED, by itself, creates a new UNTITLED or raises the existing
%      singleton*.
%
%      H = UNTITLED returns the handle to a new UNTITLED or the handle to
%      the existing singleton*.
%
%      UNTITLED('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in UNTITLED.M with the given input arguments.
%
%      UNTITLED('Property','Value',...) creates a new UNTITLED or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before untitled_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to untitled_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

% Copyright 2002-2003 The MathWorks, Inc.

% Edit the above text to modify the response to help untitled

% Last Modified by GUIDE v2.5 27-Apr-2006 20:24:57

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @untitled_OpeningFcn, ...
                   'gui_OutputFcn',  @untitled_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 untitled is made visible.
function untitled_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 untitled (see VARARGIN)

% Choose default command line output for untitled
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes untitled wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = untitled_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)
N=64;
n=0:63;
t=0.01*n;
q=n*2*pi/N;
x=cos(3*pi/20*t);
                                      %生成信号序列
y=fft(x,N);
subplot(3,1,1);
plot(t,x);
title('source signal');
                                      %绘制源曲线信号
subplot(3,1,2);
plot(q,abs(y));            %幅度谱
title('magnitude');
subplot(3,1,3);
plot(q,angle(y));          %相位谱
title('phase');




% --- 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)
N=128;
n=0:127;
t=0.05*n;
q=n*2*pi/N;
x=cos(3*pi/20*t);
                                      %生成信号序列
y=fft(x,N);
subplot(3,1,1);
plot(t,x);
title('source signal');
                                      %绘制源曲线信号
subplot(3,1,2);
plot(q,abs(y));            %幅度谱
title('magnitude');
subplot(3,1,3);
plot(q,angle(y));          %相位谱
title('phase');




% --- 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)
n=[0:1:99];
xn=cos(3*pi/20*n);
                                      %生成信号序列
Xk=fft(xn);
kx=[0:1:length(Xk)-1];
subplot(2,1,1);
stem(n,xn);
title('time domain signal');
                                      %绘制源曲线信号
subplot(2,1,2);
stem(kx,abs(Xk));           
title('frequence domain signal(n=100)');





% --- 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)
n=[0:1:149];
xn=cos(3*pi/20*n);
                                      %生成信号序列
Xk=fft(xn);
kx=[0:1:length(Xk)-1];
subplot(2,1,1);
stem(n,xn);
title('time domain signal');
                                      %绘制源曲线信号
subplot(2,1,2);
stem(kx,abs(Xk));           
title('frequence domain signal(n=150)');





% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
wn=kaiser(length(xn),5.658);
hn=xn.*wn';
Hk=fft(hn);
kh=[0:1:length(Hk)-1];
subplot(2,1,1);
stem(n,xn);
title('time domain signal');
subplot(2,1,2);
stem(kh,abs(Hk));
title('kaiser window(n=100)');





% --- Executes on button press in pushbutton6.
function pushbutton6_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton6 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
n=[0:1:29];
xn=cos(3*pi/20*n);
gn=[xn,zeros(1,30)];
N=length(n);
M=N+30;
m=[0:1:M-1];
Xk=fft(xn,30);
Gk=fft(gn,60);
subplot(2,1,1);
stem(n,abs(Xk));
axis([0,60,0,10]);
subplot(2,1,2);
stem(m,abs(Gk));