heterodyne

说明：  本人用石川法求齿轮的啮合刚度，完整版的程序，里面可以运行啮合刚度图(Meshing Stiffness of Gears Calculated by Ishikawa Method)

SLM与削峰联合算法,matlab脚本文件(Joint algorithm of SLM and clipping)

51单片机和三菱变频器MODBUS RTU通信实例，里面有具体的通讯范例，方便初学者学习(51 single-chip microcomputer and mitsubishi inverter MODBUS RTU communication as an example, there is a specific communication paradigm, easy for beginners to learn)

说明：  单频信号经过多径时变信道后，输出信号的包络随时间随机起伏，输出信号的频谱从冲激谱变成一个窄带频谱。径数位20，变化频率从0—2HZ随机均匀抽取。(Single-frequency signal through time-varying multipath channel, the output signal envelope random fluctuations over time, the output signal from the impulse of the spectrum into a narrow-band spectrum spectrum. Digital Drive 20, changes in frequency from 0-2HZ uniform random samples.)

针对GPS干扰特性，对GPS系统进行猛特卡落干扰仿真(GPS interference characteristics for the GPS system Meng tecka charged interference simulation)

说明：  大规模天线检测，运用近似消息传递算法，仿真实验(Massive MIMO detection by implement AMP)

说明：  设计一个数字低通滤波器，来近似一个理想数字滤波器(Design a digital low-pass filter to approximate an ideal digital filter)

It is mainly used for ARQ simulation ,such as stop-and-wait

利用维特比算法解调GMSK信号 维特比算法的一个用处(Viterbi algorithm using GMSK signal demodulation Viterbi algorithm is a useful)

简单实现基于加权分数傅里叶变换的混合载波系统(Simple Implementation of Hybrid Carrier System Based on Weighted Fractional Fourier Transform)