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03607_28
DFT进行频谱分析时的三种现象
1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。
采样前加低通滤波器防混叠
2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。
改用其他窗函数（非矩形）改善泄漏。
3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。(DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.)
- 2007-05-08 16:22:17下载
- 积分：1
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idct2dim_ib002
This program computes the 2D IDCT as per the equation. The result matches the output of the
built-in Matlab function.Good for analysis.
- 2011-10-05 20:43:09下载
- 积分：1
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SCM-2013-11-20
看了一段时间的3GPP的信道建模，所以自己动手写了一个（参考了该协会的标准代码，不过改良了一些，执行效率更高）(the 3GPP SCM model building. Comparing to the original code, this task is more efficient and clearer.)
- 2013-12-19 22:09:28下载
- 积分：1
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fzgiztrx
相关分析过程的matlab方法，部分实现了追踪测速迭代松弛算法，一些自适应信号处理的算法，搭建OFDM通信系统的框架，用MATLAB实现动态聚类或迭代自组织数据分析，合成孔径雷达（SAR)目标成像仿真，包括 MUSIC算法，ESPRIT算法 ROOT-MUSIC算法。( Correlation analysis process matlab method, Partially achieved tracking speed iterative relaxation algorithm, Some adaptive signal processing algorithms, Build a framework OFDM communication system, Using MATLAB dynamic clustering or iterative self-organizing data analysis, Synthetic Aperture Radar (SAR) imaging simulation target, Including the MUSIC algorithm, ESPRIT algorithm ROOT-MUSIC algorithm.)
- 2016-04-07 22:10:35下载
- 积分：1
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Matlabsuanfaji
说明： matlab算法集 matlab算法集 (matlab algorithms algorithms matlab)
- 2008-09-27 19:56:20下载
- 积分：1
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CQuakeDemo
本程序源码是为日本一家地震监测机构编写的，用来演示地震对不同楼层的作用效果。可以手动调整震动幅度的比例。(the program source code is one of Japan's earthquake monitoring bodies to prepare, used to demonstrate the different floors of the earthquake in effect. Vibration can be manually adjusted rate ratio.)
- 2007-04-08 21:09:09下载
- 积分：1
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LOsignal
产生一个有带内相位噪声，毛刺噪声，白噪声的LO信号。(creative a LO signal with in band phase noise， spurs and noise floor.)
- 2013-10-20 12:34:10下载
- 积分：1
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mayuanyinglvboshuchu
输入的16个码元经过高斯滤波器后的输出波形(16 symbols input after the output waveform of the Gaussian filter)
- 2013-04-28 17:29:11下载
- 积分：1
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matlab-Model
一些经典的Matlab模型，适合新手参考用。(Matlab model for a number of classic, suitable for novice reference.)
- 2010-01-26 22:26:30下载
- 积分：1
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zishiyingTVquzao
自适应TV去噪，是一种自适应滤波算法，处理噪声效果良好，适合编程参考(TV adaptive de-noising, is an adaptive filter algorithm processing noise effect is good for programming reference)
- 2015-05-05 09:18:15下载
- 积分：1
