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杨建国老师的通讯原理课件，第三章模拟信号的调制与解调，主要讲述信号产生与调制，射频特性，解调，MSK、GMSK、PSK、QPSK、BPSK、QAM等原理(Yang Jianguo teacher communication principles of courseware, the third chapter of the analog signal modulation and demodulation, and focuses on the signal generation and modulation, the RF characteristics, demodulation, MSK, GMSK, PSK, QPSK, as BPSK, QAM and other principles of)

南京工程学院通信专业现代交换技术期末考试总结(Nanjing Institute of Communications professional modern switching technology final exam summary.)

O Reilly Google Hackes is the most wanted book for SEO and SEF optmizations in the world. This is the full version in .pdf format

WAGO的标准EDS文件,可以用于WAGO的远程IO跟第三方的PLC进行通讯(This is WAGO eds files)

gardner位同步算法，实现数字通信系统中位同步(gardner bit synchronization algorithm to achieve bit synchronization in a digital communication system)

介绍常用的AT指令，包括gpsr初始化，发短信等(Commonly used in the AT commands, including the gpsr initialization, send text messages, etc.)

Photovoltaic systems, solar thermal systems based on knowledge training(PVSystem)

optimal coverage problem of wireless sensor network

A good book for C++ for beginners

恒频恒压(CVCF)逆变电源的输出电压波形质量是衡量其性能的重要指标之一。文章采用一种重复控制和双闭环控制相结合的电压波形控制策略，以重复控制器提高逆变电源输出电压的稳态精度，减小总谐波畸变率；以双闭环控制器达到较快的动态响应速度。该方案在一台采用TMS320F240 DSP控制芯片的50 Hz三相PWM逆变器上得到验证。(Constant voltage constant frequency (CVCF) Inverter output voltage waveform quality is an important measure of its performance indicators. Paper using a repetitive control and the combination of double closed loop control voltage waveform control strategy to improve the repetitive controller output voltage inverter steady-state accuracy and reduce total harmonic distortion to achieve a faster dual-loop controller dynamic response speed. The program uses TMS320F240 DSP in a 50 Hz phase control chip PWM inverter has been to verify.)