crp

mobile multipath fading channel empirical model HATA model for vehicular, pedastarian and urban/suburban demographic

说明：  这是我自己编写的一个完整的多进制GF域上RS信道编解码系统。解码采用梅西迭代算法。整个算法模块功能分明，GF域上运算都单独成为子模块，移植性强。还附有测试程序，方便了解各个模块的功能完成情况。(This is my own preparation of a comprehensive multi-band GF RS domain channel codec system. Messi iterative decoding algorithm used. The whole algorithm module function clear, GF domain computing is to become a separate sub-module, transplants strong. Also included testing procedures to facilitate the understanding of various modules of the completion of the function.)

1、验证窗函数 N 变化时，验证其频谱主瓣副瓣比、主瓣宽度的变化。 a)矩形窗函数的 N 变化时，验证其其频谱主瓣副瓣幅度比基本不会发生变化， 而主瓣宽度将会变窄。这说明，当用矩形窗函数设计滤波器时，增大 N 不能使 得阻带衰减减小，但能够减小过渡带。 b)再选取其他的窗如 hamming/hanning 窗，验证当 N 变化时，其频谱主瓣宽 度变化、主瓣副瓣比值变化情况。 2、用窗函数法设计线性相位 FIR 低通，通带截止频率 wp=0.5PI, 阻带截止频率 ws=0.6PI, 阻带衰减不小于 40dB,通带衰减不大于 3dB. a)选取 Hanning,Hamming 窗查看设计出来的 FIR 的过渡带宽和阻带衰减是否 满足要求，二者有什么不同。 b)使用 hamming 窗，将窗长增大 1 倍，设计 FIR。验证同样的窗函数类型 (hamming)，不同窗长度时，设计出来的 FIR 的过渡带宽和阻带衰减都有什么变 化。 3、不使用 Matlab 系统函数得到上一项指标的低通，并与上一项结果比较。 4 用窗函数法设计线性相位 FIR 高通，通带截止频率 wp=0.8PI, 阻带截止频率 ws=0.7PI, 阻带衰减不小于 30dB,通带衰减不大于 3dB.(An actual filter is implemented using the truncated unit impulse response sequence of the ideal filter. For the ideal low pass filter, the unit impulse response h, N, D () is intercepted by a length of N, and the length is The N sequence H (n), when intercepted, guarantees causality and linear phase requirements for the filter. In order to reduce the Gibbs effect, the H (n) window is added, and the appropriate window function is selected to ensure the stopband attenuation and Transition zone requirement. Note that the sidelobe of the window function affects the stopband attenuation of the filter, and the main lobe width affects the filter Transition bandwidth.)

非归零型差分相位调制信号建模与仿真分析 ，合成孔径雷达（SAR)目标成像仿真，MIMO OFDM matlab仿真。( NRZ type differential phase modulation signal modeling and simulation analysis, Synthetic Aperture Radar (SAR) imaging simulation target, MIMO OFDM matlab simulation.)

说明：  ADUC7026原理图,很好用,给大家做个参考(ADUC7026)

DC-DC降压变换器，采用二次型最优控制策略，把一个电压源变为低压的稳定电源(DC- DC buck converter, using the quadratic optimal control strategy, a voltage source to the stability of the low voltage power supply)

these are some papers on dstatcom

混频信号通过低通滤波器后的信号的频谱图,matlab程序 有注释(Mixed signal through the low pass filter of the signal spectrum.)

说明：  fm调制程序，自己手写，效果较好，易于实现，速度较快(fm modulation procedures, their own handwriting, better, easy to implement, faster)

用matlab实现lms算法，可以在信号处理中减小噪声的误差(Using matlab lms algorithm can reduce the noise in the signal processing error)