xiangjibiaoding

image processing filter

数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控。(Transmission of digital signals into base band transmission and band-pass transmission, in practice, most of the channel with band-pass characteristics can not directly transmit base-band signal. In order to make the digital signal is transmitted with a communication channel, you must use the digital baseband signal to modulate the carrier to make the signal to match the characteristics of the channel. The digital baseband signal control with a carrier, the digital baseband signal conversion to digital bandpass signal is called digital modulation. Keying method is commonly used digital modulation, such as on the carrier' s amplitude, frequency and phase shift keying.)

LSTC(分层空时码)的BLAST系统用matlab语言实现其系统仿真，非常有用的源代码。(LSTC for BLAST system ，the source code for space time coding method using matlab language，very useful。)

Matlab软件求矩阵的特征值，进行矩阵的初等变换；讨论向量组的线性相关性等运算。(Matlab software, the eigenvalues of a matrix, the matrix of the elementary transformation discussion of linear correlation vector group such operations.)

利用伯德图来证明DC-8飞机，在0.84Mach和10000m高空的俯仰运动稳定性。( This example is to demonstrate pitch motion tracking control by using Bode diagram with elevator inputs for the DC-8 at 0.84Mach and 10000m )

A Novel Image Reconstruction Algorithm Based on Concatenated Dictionary This paper presents a novel method for image reconstruction, which decomposites the image by concatenating a redundant dictionary of several bases and then reconstruct the image efficiently by means of Matching Pursuit algorithm. The proposed method constructs the concatenated dictionary with cosine bases, wavelet bases and contourlet bases, which will lead to a better approximation of the original image. The experimental results show that the proposed algorithm can greatly reduce the computational complexity and generate a better reconstruction effect compared with previous methods.(A Novel Image Reconstruction Algorithm Based on Concatenated Dictionary This paper presents a novel method for image reconstruction, which decomposites the image by concatenating a redundant dictionary of several bases and then reconstruct the image efficiently by means of Matching Pursuit algorithm. The proposed method constructs the concatenated dictionary with cosine bases, wavelet bases and contourlet bases, which will lead to a better approximation of the original image. The experimental results show that the proposed algorithm can greatly reduce the computational complexity and generate a better reconstruction effect compared with previous methods.)

详细讲述了∏/4-DQPSK调制和解调原理,并提供了matlab实现的代码(Detail the Π/4-DQPSK modulation and demodulation, and provides a matlab implementation of the code)

matlab partial code for reference purpose

MATLAB Programming for Engineers

MATLAB的基于离散小波变换的数字水印嵌入与提取。(MATLAB-based discrete wavelet transform digital watermark embedding and extraction.)