laplacian

Channel estimation techniques for OFDM systems based on a pilot arrangement are investigated. Channel estimation based on a comb type pilot arrangement is studied through different algorithms for both estimating the channel at pilot frequencies and interpolating the channel. Channel estimation at pilot frequencies is based on LS and LMS methods while channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to the time domain by means of IDFT (inverse discrete Fourier transform), zero padding and going back to the frequency domain by DFT (discrete Fourier transform). In addition, channel estimation based on a block type pilot arrangement is performed by sending pilots in every sub-channel and using this estimation for a

东方红乐曲，基本语调，但是有点改进，只是最基本的(music for a famous songs in China!Please enjoy it!)

说明：  带限信号通过带通滤波器的信噪比改善，通过2000-5000KHZ和3000-4000KHZ的带通滤波器(Band-limited signal to noise ratio by improving the band-pass filter, through the 2000-5000KHZ and 3000-4000KHZ band-pass filter)

利用求语音信号倒谱的方法，对语音信号进行基音检测，并绘制出波形图。(Use for speech signal spectrum method of fall, the speech signal pitch detection, and rendering the waveform figure.)

R-NSGAII的文章及matlab源代码，亲自实验能运行，对研究多目标很有帮助(R- NSGAII articles and matlab source code, experiment can run in person, is very helpful for research object)

采用ukf-SLAM算法对机器人和目标进行同步的定位(Ukf-SLAM algorithm using the robot and target position synchronized)

matlab画三维图的几个函数的用法和一些简单的案例(the matlab draw three-dimensional map usage of several functions and some simple cases)

模糊控制中离线生产查询表，已经经过验证！(Fuzzy control and production of lut, has been validated.)

完整的循环谱计算代码，可以直接运用，稍加改动就可以变成其他的循环谱形式，欢迎下载。(Complete cycle spectrum calculation code can be directly applied, a little change can become another form of cyclic spectrum, welcome to download.)

光波在二维电介质中波导现象的有限时域差分计算方法。(2D FDTD of light guided through dielectric ridge waveguide.)