【数字信号调制】基于matlab GUI数字信号调制仿真系统【含Matlab源码 336期】

一、获取代码方式

获取代码方式1：

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二、简介

1 系统简介

平台用于模拟通信系统中调制信号并仿真出频谱图，主要有幅度调制、角度调制、数字调制及自适应均衡，在相应的调制模块下，用户通过输入相应的参数即可得到输出结果。是集信息采集、处理、加工、传播的重要处理平台。

2 数字调制技术

数字调制是指用数字数据调制模拟信号，主要有三种形式：移幅键控法ASK、移频键控法FSK、移相键控法PSK。

2.1 幅度键控（ASK）

即按载波的幅度受到数字数据的调制而取不同的值，例如对应二进制0，载波振幅为0；对应二进制1，载波振幅为1。调幅技术实现起来简单，但容易受增益变化的影响，是一种低效的调制技术。在电话线路上，通常只能达到1200bps的速率。

2.2 频移键控（FSK）

即按数字数据的值（0或1）调制载波的频率。例如对应二进制0的载波频率为F1，而对应二进制1的载波频率为F2。该技术抗干扰性能好，但占用带宽较大。在电话线路上，使用FSK可以实现全双工操作，通常可达到1200bps的速率。

2.3 相移键控（PSK）

即按数字数据的值调制载波相位。例如用180相移表示1，用0相移表示0。这种调制技术抗干扰性能最好，且相位的变化也可以作为定时信息来同步发送机和接收机的时钟，并对传输速率起到加倍的作用

2.4 QAM

又称正交幅度调制法。在二进制ASK系统中，其频带利用率是1bit／s·Hz，若利用正交载波调制技术传输ASK信号，可使频带利用率提高一倍。如果再把多进制与其它技术结合起来，还可进一步提高频带利用率。能够完成这种任务的技术称为正交幅度调制（QAM）。它是利用正交载波对两路信号分别进行双边带抑制载波调幅形成的。通常有二进制 QAM，四进制QAM（16QAM），八进制QAM（64QAM），……等。

MQAM星座图如下图所示：

2.5 PAM

相位幅度调制(Phase Amplitude Modulation),采用多相PSK可以有效提高数据传输速率，但受实际电话传输网的限制，相移数已达到上限，再要提高数据传输速率，只能另寻它法。PSK和ASK技术的结合，可以解决这个问题。

例如，采用12种相位，其中4种相位每个信号取2种幅度，这样就得到16种不同的相位幅度离散状态，可以使一个码元表示4位二进制数据，从而大大提高了数据传输速率。

这种类型的调制解调器有效数据传输率可达9600bps

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');end

四、运行结果

五、matlab版本及参考文献

1 matlab版本

a

2 参考文献

[1] 沈再阳.精通MATLAB信号处理[M].清华大学出版社，.

[2]高宝建,彭进业,王琳,潘建寿.信号与系统——使用MATLAB分析与实现[M].清华大学出版社，.

[3]王文光,魏少明,任欣.信号处理与系统分析的MATLAB实现[M].电子工业出版社，.