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1、无线楼宇数据传输系统的仿真1. 摘要本实验的内容是无线楼宇数据传输仿真，分析915M的楼宇通信特性，建立楼宇数据通信系统的仿真模型，采用无线收发芯片NRF905，依据其性能参数来判断楼宇内两点能否进行数据传输。2. 实验内容：无线楼宇数据传输系统的仿真。分析915M的楼宇通信特性，建立楼宇数据通信系统的仿真模型，采用无线收发芯片NRF905，依据其性能参数来判断楼宇内两点之间能否进行数据传输。路径损耗（Path Loss）主要是由三个方面的因素导致的：一是发射机和接收机之间相隔的距离；二是同一楼层的软隔板；三是竖直方向的混凝土墙。它们造成的路径损耗可用以下公式表示：PL(d)dB=20*log
2、10(4*pi*d/l)+p*AF(soft partition)dB+q*AF(concret wall)dB.其中d是收发之间相隔的距离(m)，l是芯片发出信号的波长（l= c / f = 300 M / 914 M = 0. m），p是软隔墙数，其相应的AF(soft partition)=1.39dB,q是混凝土墙数,其相应的 AF(concret wall)=2.38dB。由此，考虑此仿真系统为二维。即：当知道软隔墙数p和混凝土墙数q时，根据平面两点之间距离公式，可以得到收发之间相隔的近似距离：d=sqrt(p*x)2+(q*y)2).其中x为每两个软隔墙之间的水平距离，y为每两个混
3、凝土墙楼层之间的竖直高度。x,y为已知参数。所以程序需输入p、q两个变量，即可得到收发之间相隔的近似距离，进而算出收发之间的路径损耗。无线收发芯片NRF905的最大输出功率为10dBm=-20dB，接收分辨功率（能接收到的最小功率）为-100dBm=-130dB，所以其能允许的最大衰减范围为-20-（-130）=110dB，当路径损耗在此范围内芯片能够收发信号。程序中先算出发射机和接收机之间的路径损耗，再与110dB相比较。若小于110dB，则在允许的衰减范围内，能够进行无线楼宇数据通信；若大于110dB，则超出允许的衰减范围，不能进行无线楼宇数据通信。最后，程序分别绘制出路径损耗随软隔墙数p
4、和混凝土墙数q的变化曲线。即同一楼层（q=0）的路径损耗随软隔墙数的增加（水平距离的增大）的变化曲线；和竖直方向上(p=0)路径损耗随混凝土墙数的增加（竖直高度的增加）的变化曲线。3. 实验程序及结果：function varargout = Wirelesscommunication_building(varargin)% WIRELESSCOMMUNICATION_BUILDING M-file for Wirelesscommunication_building.fig% WIRELESSCOMMUNICATION_BUILDING, by itself, creates a new W
5、IRELESSCOMMUNICATION_BUILDING or raises the existing% singleton*.% H = WIRELESSCOMMUNICATION_BUILDING returns the handle to a new WIRELESSCOMMUNICATION_BUILDING or the handle to% the existing singleton*.% WIRELESSCOMMUNICATION_BUILDING(CALLBACK,hObject,eventData,handles,.) calls the local% function
6、named CALLBACK in WIRELESSCOMMUNICATION_BUILDING.M with the given input arguments.% WIRELESSCOMMUNICATION_BUILDING(Property,Value,.) creates a new WIRELESSCOMMUNICATION_BUILDING or raises the% existing singleton*. Starting from the left, property value pairs are% applied to the GUI before Wirelessco
7、mmunication_building_OpeningFunction gets called. An% unrecognized property name or invalid value makes property application% stop. All inputs are passed to Wirelesscommunication_building_OpeningFcn via varargin.% *See GUI Options on GUIDEs Tools menu. Choose GUI allows only one% instance to run (si
8、ngleton).% See also: GUIDE, GUIDATA, GUIHANDLES% Edit the above text to modify the response to help Wirelesscommunication_building% Last Modified by GUIDE v2.5 18-May-2006 22:38:07% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct(gui_Name, mfilename, . gui_Singleton, gui_
9、Singleton, . gui_OpeningFcn, Wirelesscommunication_building_OpeningFcn, . gui_OutputFcn, Wirelesscommunication_building_OutputFcn, . gui_LayoutFcn, , . gui_Callback, );if nargin & ischar(varargin1) gui_State.gui_Callback = str2func(varargin1);endif nargout varargout1:nargout = gui_mainfcn(gui_State,
10、 varargin:);else gui_mainfcn(gui_State, varargin:);end% End initialization code - DO NOT EDIT% - Executes just before Wirelesscommunication_building is made visible.function Wirelesscommunication_building_OpeningFcn(hObject, eventdata, handles, varargin)% This function has no output args, see Output
11、Fcn.% 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 Wirelesscommunication_building (see VARARGIN)% Choose default command line output for Wirelesscommunication
12、_buildinghandles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes Wirelesscommunication_building wait for user response (see UIRESUME)% uiwait(handles.figure1);% - Outputs from this function are returned to the command line.function varargout = Wirelesscommunicatio
13、n_building_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
14、 from handles structurevarargout1 = handles.output;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) return
15、s contents of edit1 as text% str2double(get(hObject,String) returns contents of edit1 as a double% Read the input value edit1 = str2double(get(hObject,String);% Check whether the input is a numberif isnan(edit1) set(hObject, String, 1); errordlg(Input must be a number,Error);endif (edit14) errordlg(
16、发射机和接收机相隔的楼层数必须在零到四层之间,Error);end;% Save the new valuedata = getappdata(gcbf, metricdata);data.edit1 = edit1;setappdata(gcbf, metricdata, data);% - Executes during object creation, after setting all properties.function edit1_CreateFcn(hObject, eventdata, handles)% hObject handle to edit1 (see GCBO)%
17、 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,defaultUicontrolBackg
18、roundColor) set(hObject,BackgroundColor,white);endfunction 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
19、 contents of edit2 as text% str2double(get(hObject,String) returns contents of edit2 as a double% Read the input valueedit2 = str2double(get(hObject,String);% Check whether the input is a numberif isnan(edit2) set(hObject, String, 1); errordlg(Input must be a number,Error);endif edit20 errordlg(发射机和
20、接收机相隔的距离必须大于0,Error);end;% Save the new valuedata = getappdata(gcbf, metricdata);data.edit2 = edit2;setappdata(gcbf, metricdata, data);% - Executes during object creation, after setting all properties.function edit2_CreateFcn(hObject, eventdata, handles)% hObject handle to edit2 (see GCBO)% eventdat
21、a 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,defaultUicontrolBackgroundColo
22、r) set(hObject,BackgroundColor,white);endfunction 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
23、 of edit3 as text% str2double(get(hObject,String) returns contents of edit3 as a double% Read the input valueedit3 = str2double(get(hObject,String);% Check whether the input is a numberif isnan(edit3) set(hObject, String, 1); errordlg(Input must be a number,Error);endif edit30 errordlg(收发之间的软隔墙数必须大于
24、或等于0,Error);end;% Save the new valuedata = getappdata(gcbf, metricdata);data.edit3 = edit3;setappdata(gcbf, metricdata, data);% - Executes during object creation, after setting all properties.function edit3_CreateFcn(hObject, eventdata, handles)% hObject handle to edit3 (see GCBO)% eventdata reserve
25、d - 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(hO
26、bject,BackgroundColor,white);endfunction 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
27、 as text% str2double(get(hObject,String) returns contents of edit4 as a double% Read the input valueedit4 = str2double(get(hObject,String);% Check whether the input is a numberif isnan(edit4) set(hObject, String, 1); errordlg(Input must be a number,Error);endif edit40 errordlg(收发之间的混凝墙数必须大于或等于0,Erro
28、r);end;% Save the new valuedata = getappdata(gcbf, metricdata);data.edit4 = edit4;setappdata(gcbf, metricdata, data);% - Executes during object creation, after setting all properties.function edit4_CreateFcn(hObject, eventdata, handles)% hObject handle to edit4 (see GCBO)% eventdata reserved - to be
29、 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,Bac
30、kgroundColor,white);end% - 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)data =
31、getappdata(gcbf, metricdata);p=data.edit3; %收发之间的软隔墙数q=data.edit4; %收发之间的混凝土墙数x=5; %每两个软隔墙之间的距离(m)y=3; %每一楼层的高度(m)d=sqrt(p*x)2+(q*y)2); %发射机和接收机之间相隔的近似距离(m)l=0.; %波长，l=c/f=300M (m/s) /914M (Hz) =0.6 mAF_soft=1.39; %每层软隔板的路径衰减值(dB)AF_concret=2.38; %每层混凝土墙的路径衰减值(dB)PL=20.0*log10(4*pi*d/l)+p*AF_soft+q*
32、AF_concret; %同一楼层中发射机和接收机之间有软隔墙和混凝土墙的路径损耗 set(handles.text7, String, PL); %返回到fig中if PL=110 %判断得到的路径损耗值（dB）是否在允许的范围(110dB)之内 str=路径损耗在允许的范围内，可以在楼宇间进行无线数据传输;else str=路径损耗超出范围，不能在楼宇间进行数据传输;end;set(handles.text6, String, str); %返回到fig中p0=0; %收发之间的软隔墙数q0=0; %收发之间的混凝土墙数p1=1:20; %收发之间软隔墙数矢量 d1=(x*p1).2+(y
33、*q0)2).0.5; %混凝土墙数q0=0时，收发之间相隔水平距离矢量 PL1=20.0*log10(4*pi*d1/l+eps)+p1*AF_soft+q0*AF_concret; %当发射机和接收机之间混凝土墙数q0=4时,路径损耗矢量(dB) q1=1:20; %收发之间混凝土墙数矢量d2=(x*p0)2+(y*q1).2).0.5; %软隔墙数p0=0时，收发之间相隔垂直距离矢量 PL2=20.0*log10(4*pi*d2/l+eps)+p0*AF_soft+q1*AF_concret; %当发射机和接收机之间软隔墙数p0=4时，路径损耗矢量(dB)figuresubplot(2,1,1);plot(p1,PL1,-rd); %绘制同一楼层路径损耗随软隔墙数的变化曲线title(路径损耗在同一楼层内的变化曲线);subplot(2,1,2);plot(q1,PL2,-.rd); %绘制竖直方向上路径损耗随混凝土墙数的变化曲线title(路径损耗在数值方向上的变化曲线);仿真结果：实验结果与实验分析的一致，即：若小于110dB，则在允许的衰减范围内，能够进行无线楼宇数据通信；若大于110dB，则超出允许的衰减范围，不能进行无线楼宇数据通信。