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By building the generalized Sigmoid function relationship between normalized step-size and the power of error signal, a novel variable step-size NLMS algorithm is proposed. It is proved that the step-size of NPVSS-NLMS changes as the new algorithm does when A=σv -m and B=2. The physical meanings of the parameters in this algorithm are explored. The theoretical analysis illustrate that this algorithm combine the virtues of NPVSS-NLMS and Sigmoid function, and it leads to faster convergence rate and lower final misalignment. The computer simulation results support the theoretical analysis.

lms基础算法，已经经过测试，可以通过。(LMS basic algorithm has been tested and passed.)

RFM 70 radio Transever 2.4GHz

心电信号去噪方法等研究，采集，去除噪声等(Research on the denoising method of ECG signal, collection, noise removal, etc.)

LDPC码编译码程序，C语言，译码位BP译码算法 code&decode BP(LDPC code&decode BP)

锁相环问题的仿真，可以解决数字锁相环的仿真问题(Phase-locked loop simulation problem, can solve the problem of digital phase-locked loop simulation)

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This includes how to protect the speaker using matlab functions.

说明：  SLM算法降低OFDM通信系统中的PAPR，使用matlab进行仿真(SLM algorithm reduces PAPR in OFDM communication system, and matlab is used for simulation)

Modbus for Field Technicians 介绍modbus的相当好的资料，包括原理和编程和协议介绍(Modbus for Field Technicians introduction modbus fairly good information, including schematics and programming and protocol description)