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[Software EngineeringDTFT

Description: 经由正、负离散时间傅立叶变换表达式是信号分析的一个关键部分。 X( ) (3.9) (3.10) 当 LTI 系统用于滤波的时候,作为冲激响应离散时间傅立叶的频 率响应,提供了 LTI 系统间接的描述。离散时间傅立叶变换 X( )是 w 的周期复值函数,周期总是 2π,并且基周期通常选在区间[-π,π] 上。对离散时间傅立叶变换 DTFT 来说有两个问题: 1. DTFT 的定义对无限长信号是有效的。 2. DTFT 是连续变量 w 的函数 在 MATLAB 中, 任何信号 (向量) 必须是有限长度的, 所以 DTFT 无法用 MATLAB 直接计算。当能从变换定义式推导出解析式并计算 它时, 可以用 MATLAB 计算。 第二个问题是频率抽样问题。 MATLAB 擅长在有线网络点上计算 DTFT,通常选足够多的频率以使绘出的图 平滑,逼近真实的 DTFT。3.计算DTFT需要两个函数,MATLAB的freqz函数计算无限长信号,dtft(h,H)函数计算有限长信号的DTFT。-Passive and negative discrete Fourier transform expressions are a key part of signal analysis.   X () (3.9) (3.10) When the LTI system is used for filtering, the frequency response of the discrete time Fourier as an impulse response provides an indirect description of the LTI system. Discrete time Fourier transform X () is the periodic complex function of w, the period is always 2π, and the base period is usually selected in the interval [-π, π]. There are two problems with the discrete-time Fourier transform DTFT: 1. The definition of DTFT is valid for infinite length signals. 2. DTFT is a function of continuous variable w In MATLAB, any signal (vector) must be finite length, so DTFT can not be directly calculated using MATLAB. When you can derive the analytic the transformation definition and calculate it, you can use MATLAB to calculate. The second problem is frequency sampling. MATLAB is good at calculating DTFTs at wired network points and usually selecting enough frequen
Platform: | Size: 13312 | Author: 张丽丽 | Hits:

[Windows Develop8336335

Description: 用matlab simulink写的W-CDMA的仿真过程的整个代码, 包含信道编码,交织,速率匹配,调制,扩频,信道模型,()
Platform: | Size: 339968 | Author: mtack | Hits:

[Communication8427096

Description: W-CDMA的仿真代码:包含信道编码,交织,速率匹配,调制,扩频,信道模型,RACK接收机和相应的解码程序matlab和()
Platform: | Size: 412672 | Author: njaxer | Hits:

[Other119128659StereoSAD实现定位

Description: 很好的MATLAB程序实现双目立体视觉定位(MATLAB StereoSAD SSDImage = zeros(H, W))
Platform: | Size: 789504 | Author: 蓉城uhp | Hits:

[Communication-MobileUVTB

Description: wcdma_simulation_simulink用matlab simulink写的W-CDMA的仿真过程的整个代码()
Platform: | Size: 339968 | Author: Edaar | Hits:

[Com PortXZVZUJ

Description: 用matlab simulink写的W-CDMA的仿真过程的整个代码, 包含信道编码,交织,速率匹配,调制,扩频,信道模型,()
Platform: | Size: 118784 | Author: Lcnaom | Hits:

[Process-Threadjydz

Description: W-CDMA的仿真代码:包含信道编码,交织,速率匹配,调制,扩频,信道模型,RACK接收机和相应的解码程序matlab和()
Platform: | Size: 412672 | Author: wrcphea | Hits:

[Windows Develop680454

Description: wcdma_simulation_simulink用matlab simulink写的W-CDMA的仿真过程的整个代码()
Platform: | Size: 118784 | Author: chapx | Hits:

[Othermusic

Description: MUSIC 算法MATLAB仿真源代码 clc clear all format long %将数据显示为长整型科学计数 N=200;%快拍数 doa=[20 60]/180*pi; %信号到达角 w=[pi/4 pi/3]';%信号频率 M=10;%阵元数 P=length(w); %信号个数 lambda=150;%波长 d=lambda/2;%阵元间距 snr=20;%信噪比 B=zeros(P,M); %创建一个P行M列的0矩阵 for k=1:P B(k,:)=exp(-j*2*pi*d*sin(doa(k))/lambda*[0:M-1]); %矩阵赋值 end B=B'; xx=2*exp(j*(w*[1:N])); %仿真信号 x=B*xx; x=x+awgn(x,snr);%加入高斯白噪声 R=x*x'; %数据协方差矩阵 [U,V]=eig(R); %求R的特征值和特征向量 UU=U(:,1:M-P); %估计噪声子空间 theta=-90:0.5:90; %%谱峰搜索 for ii=1:length(theta) AA=zeros(1,length(M)); for jj=0:M-1 AA(1+jj)=exp(-j*2*jj*pi*d*sin(theta(ii)/180*pi)/lambda); end WW=AA*UU*UU'*AA'; Pmusic(ii)=abs(1/ WW); end Pmusic=10*log10(Pmusic/max(Pmusic)); %空间谱函数 plot(theta,Pmusic,'-k') xlabel('角度 \theta/degree') ylabel('谱函数P(\theta) /dB') title('MUSIC算法的DOA估计谱') grid on(MUSIC algorithm MATLAB simulation source code)
Platform: | Size: 15360 | Author: 冠华 | Hits:

[matlabburgers equation

Description: 自己收集的一些关于Burgers方程数值解法的matlab程序,有五点差分法、L-W格式、WENO格式等。(Some matlab programs about numerical solution of Burgers equation collected by myself include five-point difference method, L-W scheme, WENO scheme and so on.)
Platform: | Size: 174080 | Author: zcp6392 | Hits:
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