rozwi_zania

基于DCT的数字水印的Matlab仿真实现(Digital Watermarking Based on DCT of Matlab simulation)

说明：  4. 试说明卷积编解码的工作原理。请用Simulink仿真卷积编码，并用Viterbi译码的方法进行解码，其中的编码、译码全部是自己编写代码(S-Function方式)，不是调用Simulink的已有编码、译码函数。请在加性白高斯噪声信道中，画出比特信噪比与误码率的关系曲线。(4 Explain the working principle of convolutional encoding and decoding. Please use the Simulink simulation convolutional coding and Viterbi decoding method used to decode, in which the encoding, decoding all write your own code (S-Function mode), instead of calling the Simulink existing encoding and decoding functions. In additive white Gaussian noise channel, signal to noise ratio and bit error rate to draw the curve.)

Stop-and-wait ARQ is a method used in telecommunications to send information between two connected devices. It ensures that information is not lost due to dropped packets and that packets are received in the correct order. It is the simplest kind of automatic repeat-request (ARQ) method. A stop-and-wait ARQ sender sends one frame at a time it is a special case of the general sliding window protocol with both transmit and receive window sizes equal to 1. After sending each frame, the sender doesn t send any further frames until it receives an acknowledgement (ACK) signal. After receiving a good frame, the receiver sends an ACK. If the ACK does not reach the sender before a certain time, known as the timeout, the sender sends the same frame again.

经典谱估计的几个经典算法，包括BT法，周期图法，改进周期图法等。。。MATLAB7.3上顺利编译通过(Classical spectral estimation of several classic algorithms, including the BT method, periodogram, modified periodogram method. . . MATLAB7.3 compile smoothly)

自己写的几个matlab的函数，自己处理数据是常用。有滤波函数、平移函数等。处理后新生成的数组和原数组大小相同，行列特性也相同。(Himself wrote several matlab functions, deal with their own data is commonly used. There are filtering function, translation function, and so on. The new array is generated after treatment and the original array the same size, the ranks of features are the same.)

说明：  sift提取特征点、描述子、最后进行匹配。(sift ：feature point，descriptor， matching。)

说明：  线性离散系统的批处理最小二乘参数估计的例程，噪声为方差为1的白噪声(Batch least squares linear discrete systems parameter estimation routine, the noise is white noise variance of 1)

EGC（Equal gain combining)模式下，在瑞利衰落环境的能量检测(EGC (Equal Gain Combining) mode detection in Rayleigh fading environment, energy)

program for pam and qpsk for matlab

说明：  MIMO通信系统 使用matlab描述和仿真(MIMO communication system description and simulation using matlab)