P4-1

802.11a modulation and demodulation on matlab

说明：  matlab 平面单元分析 适合采用matlab进行有限元计算的朋友(Plane element analysis matlab matlab for finite element analysis using friends)

可以用来产生复杂网络，复杂网络是现在研究热点。(can be used to produce complex networks and complex network is now hotspot.)

thanx u gav me a nice option to upload and take models

交错网格声波方程正演模拟，交错网格有限差分地震波场计算，二维的声波正演，利用空间10阶，时间2阶。(The CalCulation of the SeismiC Wave一 fieldwith Staggered-grid Finite difference Sheme)

it uses berenger thechniqe in fdtd to truncate matrix

说明：  用matlab语言实现单频脉冲信号（CW）的时域波形、频域图像、模糊度图。(The time-domain waveform, frequency-domain image and ambiguity map of single frequency pulse signal (CW) are realized by MATLAB.)

说明：  希尔伯特变换实现函数，用于对时域信号进行处理，得到相位的变化！(Hilbert transform functions for the time-domain signal processing, get the phase change!)

I have thoroughly study the basic of image compression techniques. From that I have selected SPIHT algorithm for my research work. I have implemented on image compression for gray images using SPIHT algorithm. Image compression is implemented using this algorithm has better result over the previous result on gray images and also improved PSNR value high but on other side low result on compression ratio.

The aim of this application is to implement scalable mpeg type compression by varying DCT coefficients and finding minimum number of DCT coefficients that can give minimum acceptable quality.. This application only works for gray scale.