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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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PF
说明： 有关随机有限集一阶矩PHD和粒子滤波相结合的matlab实现的程序，对于学习PHD和粒子滤波有一定的帮助！(First moment PHD filter matlab implementation procedures for random finite set.)
- 2014-06-25 16:18:15下载
- 积分：1
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ofdm
OFDM正交频分复用程序...对于初学者很有帮助
(OFDM Orthogonal Frequency Division Multiplexing procedures for beginners helpful ...)
- 2007-07-03 00:13:38下载
- 积分：1
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GSC_Schodorf
GSC為一數值演算的方法，用於求最佳值，經由反覆的演算求得最佳的結果(GSC is a numerical calculation method for seeking the best value, obtained by repeated calculation of the best results)
- 2009-06-08 17:31:46下载
- 积分：1
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matlab程序基础
说明： matlab的一些程序的基础，希望对有需要的人有些帮助。(The basis of some programs in MATLAB is expected to be helpful to those in need.)
- 2020-06-23 14:20:02下载
- 积分：1
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Ext_Kalman_Tracking
Extended kalman filter for tracking
- 2013-03-31 20:48:16下载
- 积分：1
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grid_stability_region
Code for obtaining stability measure of typical system
- 2013-11-09 01:15:10下载
- 积分：1
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1
说明： 最小均方算法的仿真， LMS算法仿真在移动通信的应用(Least mean square algorithm simulation, LMS algorithm for the application of simulation in mobile communications)
- 2009-11-15 16:53:01下载
- 积分：1
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GIsleme_uygulamalar2
this file is a matlab program. File name is 2D fast fourier transform.
- 2010-11-28 05:41:33下载
- 积分：1
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tfdemo3
说明： 在用matlab的时频分析中，不是所有信号的wvd都是可以，一些特殊的信号要用特殊的窗口来得到较好的效果(using Matlab in the time-frequency analysis, not all signals can be wvd, some special signal use special window to get good results)
- 2006-02-11 18:55:45下载
- 积分：1
