hanningchazhi

histogram of oriented gradient

Addition and multiplication of signals may favour Quality improvement, such as noise reduction, image enhancement, and echo cancellation

高分辨率距离像，是一个function函数，根据接收的信号来生成它的高分辨率一维距离像(High-resolution range profile is a function function, according to the received signal to generate its high-resolution one-dimensional range profile)

用不同的算法解决BP网络的问题，十分强大，应有尽有。(use differnt ways to solve the BP network,powerful,convinient)

基于HHT的一种新的电能质量检测的系统的研制。使用了matlab和EMTDC(Based on HHT a new power quality detection of the System. Using matlab and EMTDC)

多频混合信号，滤波器，最优化低通滤波，切比雪夫带通滤波，最优化高通滤波，matlab(Mixed multi-frequency signal, a filter, a low pass filter optimization, Chebyshev band-pass filter, high pass filter optimization, matlab)

这里面有两个程序，两个都是采用4QAM调制。不过个人觉得第一个更容易懂，因为写的很有条理。我改的那个程序就是根据这个来的。 不过在这里面有个问题就是信道系数只能是由高到低，大家可以试试，改成[0.227 0.46 0.688 0.46 0.227]这个是老师给我的仿真中常用的信道系数，这个成为归一化信道，就是系数平方和为1. 第二个程序没有涉及到信道系数，但是这个程序当中，在128个子载波中，前后有32个空载波，这个在OFDM中也是经常用的，这样可以降低误码率。 (And there are two programs, two are based on 4QAM modulation. But personally feel that the first is easier, because the writing is organized. I changed that procedure is based on the past. However, there is a problem in that there is only channel coefficients from high to low, we can try and change into [0.227 0.46 0.688 0.46 0.227] This is the teacher gave me the simulation channel coefficient commonly used, this became normalized channel, is coefficient of the square and is 1. The second program is not related to channel coefficients, but this program which, in the 128 sub-carriers, the before and after the 32 air carriers, the in OFDM is also often used, which can reduce the error rate.)

FDTD Analysis for antenna

very basic radar simulation

2d logistic regression demo