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segmentation tools for segmention lazy snaping

LDPC coding for Reyleigh fading channel

说明：  现代数字信号处理中基于互相关函数的music方法(Modern digital signal processing in the cross-correlation function-based method of music)

说明：  采用窗函数法设计一个可实现的数字FIR升余弦脉冲成形滤波器xtuanna(Use of window functions can be implemented to design a digital FIR raised cosine pulse shaping filter .xtuanna)

m序列移位寄存器 完成31位m序列。扩频通信中重要(M series shift register)

稀疏分解信号重建程序，利用匹配追踪原理不断对信号匹配，最后达到重建信号目的。(sparse decomposition signal reconstruction procedures, the use of matching principle constantly tracking the signal matching, Finally signal to the redevelopment purposes.)

hht分析电力系统中的电压闪变现象 （自己写的code，100 能用，有EMD的分解图） 实现了HHT在电力系统稳定性分析的应用(analysis power systerm disturbance-flicker base on HILBERT HUANG TRANSFORM )

This Matlab Code models a Rayleigh fading channel using a modified Jakes channel model. A modified Jakes model chooses slightly different spacings for the scatterers and scales their waveforms using Walsh–Hadamard sequences to ensure zero cross-correlation. alpha_n = frac{pi(n-0.5)}{2M} and eta_n = frac{pi n}{M}, results in the following model, usually termed the Dent model or the modified Jakes model: R(t,k) = sqrt{frac{2}{M}} sum_{n=1}^{M} A_k(n)left( cos{eta_n} + jsin{eta_n} ight)cos{left(2pi f_d t cos{alpha_n} + heta_{n} ight)}. The weighting functions A_k(n) are the kth Walsh–Hadamard sequence in n. Since these have zero cross-correlation by design, this model results in uncorrelated waveforms. The phases ,! heta_{n} are initialized randomly and have no effect on the correlation properties. Matlab fast Walsh-Hadamard transform function is used to efficiently generate samples using this model.

用matlab编写的用来求解四步相移法的光栅相位的程序(This is a matlab prepared for the four-step phase shift method to solve the grating phase program)

这一课我们用 4 个按键来控制播放音乐。K1－K3 每个键播放一首音乐，K4 按键停止 音乐的播放 (this)