swarm

In this paper, we investigate the timing and carrier frequency offset (CFO) synchronization problem in decode and forward cooperative systems operating over frequency selective channels. A training sequence which consists of one orthogonal frequency-division multiplexing (OFDM) block having a tile structure in the frequency domain is proposed to perform synchronization. Timing offsets are estimated using correlation-type algorithms. By inserting some null subcarriers in the proposed tile structure, we propose a computationally efficient subspace decomposition- based algorithm for CFO estimation. The issue of optimal tile length is studied both theoretically and through simulations. By judiciously designing the tile size of the pilot, the proposed algorithms are shown to have better performance, in terms of synchronization errors and bit error rate, than the time-division multiplexing-based training method and the computationally demanding space-alternating generalized expectation-maximization

瑞利衰落信道仿真,基于Matlab的瑞利衰落信道仿真程序源代码，还可以用C++来进行编程(Rayleigh fading channel simulation, based on Matlab Rayleigh fading channel simulation source code can also be carried out with C++ programming)

heading filter, this is a matlab file used to clean up and filter the GPS heading information for later use

说明：  不同的K近邻分类算法，基于matlab开发，不错。(matlab knn classification)

图像灰度化处理源代码，有详尽的注释，有matlab基础的同志可以看得懂的。(Grayhound processing source code, detailed notes, matlab based comrades can understand.)

symbol error rate for QPSK(4-QAM) modulation

说明：  这是matlab编写的三个程序的代码以及最后结果，是综合实验时做的(This is three programs written in matlab code and the final result is to do comprehensive experiments)

用最小均方误差方法进行观测量估计的matlab程序。使用需要提供源数据文件，修改相应的文件路径。(Matlab program estimated by observations with the minimum mean square error method. Use need to provide source data file, modify the appropriate file path.)

基于Hessian能量的半监督回归，并将其应用于半监督维数约简。(This is code for the semi-supervised regression using Hessian energy. Kwang In Kim, Florian Steinke and Matthias Hein, "Semi-supervised Regression using Hessian energy with an application to semi-supervised dimensionality reduction" NIPS 2009)

说明：  基本的图像处理技术在MATLAB里得到非常好的应用(The basic image processing technology in the years to be a very good application of MATLAB)