spiralmatrix

这是一个包络线的matlab源程序，包括了仿真程序。不过不是我写的，大家可以参考一下下了(This is an envelope of the matlab source code, including a simulation program. But I did not write, you can refer to a)

matlab高级讲义，其中包括各个实用例子的编程代码(matlab senior notes, including various practical examples of programming code)

Ultra-Wideband Communications Systems Multiband OFDM Approach W. Pam Siriwongpairat Meteor Communications Corporation K. J. Ray Liu University of Maryland

The Interleaved Frequency Division Multiple Ac- cess (IFDMA) scheme is based on compression, repetition and subsequent user dependent frequency shift of a modulated signal. Multiple access is enabled by the assignment of overlapping but mutually orthogonal subcarriers to each user. In this paper it is shown that IFDMA can be regarded as unitary precoded OFDMA with interleaved subcarriers. On the other hand, IFDMA is shown to be a CDMA variant with frequency domain orthogonal signature sequences and chip interleaving. Thus, it combines the advantages of single and multi carrier transmission such as low peak to average power ratio, orthogonality of the signals of different users even for transmission over a time dispersive channel and low complexity. Simulation results show the good performance of coded IFDMA transmission over a mobile radio channel for different data rates.

基于压缩感知理论的MRI一阶快速算法软件包(a first order fast algorithm package based on the theory of compressed sensing )

用Levinson算法，Burg算法，ARMA模型法，MUSIC算法来估算功率谱。并进行比较。(With Levinson algorithm, Burg algorithm, ARMA model method, MUSIC algorithm to estimate the power spectrum. And compared.)

此代码应用于将xml文件转换为mat文件。在图像的目标识别时我们需要获得一些图像的点坐标。但是通过label me。我们只能获得xml文件的形式，这样我们就需要将xml文件转换为mat文件。方便在matlab的语言环境中进行处理(This code is used in the xml file into mat file. When the target image recognition we need at some point in image coordinates. But by label me. We can only get in the form of xml files, so we need to convert the file to mat xml file. Facilitate processing matlab language environment)

计算权重，利用熵权法在matlab中实现操作，非常实用的(Calculate the weight, using the entropy method in the MATLAB to achieve the operation, very practical)

计算一维光子晶体的带隙计算，用MATLAB编程，时域有限差分法(photonic crystal 1_D)

关于卷积码的viterbi译码算法，可以自己设定输入的码元(On the viterbi decoding convolutional codes, can be set for the input symbol)