isodate

this is the minimal kernel for intel x86 architecture pc

求小波分析后各层系数的功率谱值，希望对大家有所帮助( 自动检测语言 划词 双语对照 中文 » 英语<~复制 For each layer coefficient after wavelet power spectrum values, hope to be of help )

QPSK Modulation Demodulation, BER vs SNR plot

我国数字电视地面国标和手机电视都采用了LDPC便解码方式。本文档包括Gallager的博士论文以及LDPC领域国内最佳教科书，是学习LDPC的最佳文献。(China Digital Television Terrestrial GB and mobile TV will use the LDPC decoding methods. This document, including Gallager)

MATLAB图论源程序..EXAMPLES(MATLAB_GRAPH_EXAMPLES)

信源为数字信号信道信噪比为10dB的直扩通信系统仿真实验-LDPC译码仿真源代码(Source to a digital signal channel 10dB SNR DSSS communication system simulation simulation-LDPC code decoding)

成功的模拟DBPSK误码率，而且精度特别高，值得学习的人好好借鉴一下(BER simulation of DBPSK successful, but accuracy is particularly high, it is a good reference to learn about people)

研究表明，构成K一L变换矩阵的向量也就是ToePhtz矩阵的特征向量。与此同时，离散 余弦变换矩阵逼近于ToePutz矩阵的特征向量矩阵，所以离散余弦变换矩阵与自然图像的 K一L变换矩阵十分相似。经过离散余弦变换后的变换系数块的协方差矩阵Cy非常接近对角 阵，即除了对角线元素以外，其它很多元素都近似为0，并且在左上角集中了主要能量。这 反映了自然图像大部分区域变化不大，亮度突变只占少数，即图像能量以低频成分为主的特 性。通过变换后的量化，舍弃对视觉效果影响较小的次要信息，可达到进一步的压缩效果。 虽然从去相关性能的意义上讲，DCT是一种次于K一L变换的准最佳变换，但是从算法实现的角度来看，DCT则远远优于K一L变换。首先，当图像的分块大小确定后，DCT的变换矩阵也就随之确定了，不随输入信号的统计特性变化而变化 其次，二维DCT能够分解成两次一维DCT，有利于硬件实现。 (Studies have shown that constitute a K L transformation matrix vector is ToePhtz eigenvector of the matrix. At the same time, discrete The cosine transform matrix approximation in ToePutz matrix eigenvector matrix, so the discrete cosine transform matrix and natural images Is very similar to a K L transformation matrix. After discrete cosine transform, the transform coefficient block of Cy is very close to the diagonal of covariance matrix Matrix, namely except diagonal elements, many other elements are approximate to 0, and focused the main energy in the upper left corner. this Reflects the natural images most area changed little, brightness mutations accounted for only a few, the energy is given priority to with low frequency components of image Sex. Through quantitative after transformation, abandoning smaller effect on the visual performance of secondary information, can achieve further compression effect. Although from related to the performance of the sense, DCT is a kind o)

常微分方程(ODEs)的MATLAB数值解法(Ordinary differential equations (ODEs) of the MATLAB numerical solution)

信号在多径衰落信道中传输特性的研究 当信号在无线信道传播时，多径发射和衰减的变化将使信号经历随机波动。因此，无线信道的特性是不确定的，随机变化的。(Signal in multipath fading channel transmission characteristics)