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fangzhen
实验一 双极性矩形随机信号的归一化功率谱密度一
1.1 功率谱密度简介
平稳过程的任何一个非零样本函数的持续时间为无限长，显然都不满足绝对可积和总能量有限的条件。因此，它的傅里叶变换不存在即没有频谱函数。所以我们用功率谱密度来表述其频谱特性。
随机过程的任一实现是一个确定的功率型信号。而对于任意的确定功率信号f(t)，它的功率谱密度为：
式中， 是f(t)的截短函数 对应的频谱函数。f(t)是平稳随机过程 的一个实现。而随机过程某一个实现的功率谱密度不能作为过程的功率谱密度。过程的功率谱密度应该看作是任一实现的功率谱密度的统计平均，即
虽然该式给出了平稳随机过程的功率谱密度，但我们通常都不利用这个式子来计算功率谱。我们知道，确知的非周期功率信号的自相关函数与功率谱密度是一对傅里叶变换。对于平稳随机过程，也有类似的关系，即
和
对于平稳随机过程我们通常先求出其自相关函数再利用上式求出其功率谱密度。
1.2 实验要求
1.了解平稳随机信号功率谱的概念及计算方法
2.仿真不同占空比，等概、非等概双极性矩形随机信号的归一化功率谱密度
3.分析不同信号所包含的频谱分量，有无直流分量和定时分量信息
(A pair of rectangular random experiment polarity signal sample return a nonzero function of any duration power spectral density of a 1.1 power spectral density of a stationary process Introduction of infinite length, apparently not satisfied absolutely integrable and the total energy of the limited conditions. Therefore, it is the Fourier transform of the spectrum that does not function does not exist. Therefore, we use the power spectral density to express their spectral characteristics. Any random process is a realization of a certain type signal power. For arbitrarily determined power signal f (t), its power spectral density is: wherein, is f (t) is a function corresponding to the truncated spectrum function. f (t) is a stationary random process of realization. The random process to achieve a certain power spectral density can not serve as the power spectral density of the process. Power spectral density process should be seen as a statistical average power spectral density of any r)
- 2014-11-30 20:39:29下载
- 积分：1
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diancibo-shiyuchafen
电磁波时域有限差分法，对于使用matlab应用fdtd方法模拟一些简单物理问题讲解很详细(Electromagnetic finite difference time domain method for simulation using matlab application fdtd explain some simple physics problem in great detail)
- 2011-04-26 20:34:58下载
- 积分：1
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haochengxu
该程序实现了对苹果内部球形缺陷的仿真分析(The program for Apple internal simulation analysis of defect of spherical
)
- 2013-04-17 16:16:01下载
- 积分：1
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release_1_01b
The carpetplot class is a tool to create four variable carpet plots and three variable cheater plots
- 2013-05-18 08:29:16下载
- 积分：1
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SCE_UA_VB
这个是段青云的SCE算法的VB和matlab版本，有需要的赶紧下载啊，非常好使。(SCE matlab VB 算法)
- 2015-04-21 11:15:35下载
- 积分：1
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ofdm-pulse-shaping
经典OFDM系统的脉冲整型，包含windows和MacOSX两个版本的矩形函数整型、半余弦整型、高斯函数整型、各向同性正交变换算法（IOTA）整型的matlab源代码。(Pulse Shaping classic OFDM system, including two versions of windows and MacOSX rectangular function integer integer half cosine, Gaussian integers, isotropic orthogonal transform algorithm (IOTA) integer matlab source code.)
- 2014-03-16 13:23:53下载
- 积分：1
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CSoptimization
说明： 基于MATLAB的布谷鸟搜索算法寻找函数最优解程序源码(Cuckoo search algorithm based on MATLAB to find the function of the optimal solution source code)
- 2020-11-20 09:56:07下载
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timesyn
说明： 通信系统中的定时同步仿真，经过matlab调试和编译，可实现定时信息提取和误差估计检测！！(Timing synchronization in communication systems simulation, debug and compile through matlab, timing information can be extracted to achieve detection and error estimates! !)
- 2010-04-21 11:03:14下载
- 积分：1
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lunwen
是一片论文，文中通过检测竹块的颜色判断是否存在缺陷，判断其等级。可以再matlab平台上对其仿真。(Is a thesis, the text block by detecting the color of bamboo to determine whether there are flaws, to determine its level. Can then simulate it on matlab platform.)
- 2011-09-28 10:47:28下载
- 积分：1
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FDTD1
FDTD 2D with PML
based on Sullivan 2D + PML
and Lazzi 2D code
Carlos J. Cela, March 2012
- 2013-04-30 02:55:35下载
- 积分：1
