ofdm_chanest

说明：  利用锁相环来实现MSK信号的定时同步，采用的是gardner算法(Using phase-locked loop to achieve timing synchronization of MSK signal, Gardner algorithm is adopted.)

这是蓝牙4.0的规范说明文档，对于了解4.0协议有所帮助。(This is the Bluetooth 4.0 specification document helpful for understanding the 4.0 protocol.)

简易智能家居,光采集,湿温度采集,自动浇花,总机控制 /************************* * 简易智能家居 * * 总机控制模块 * * 2016/4/10 * *************************/(Easy smart home, light collection, wet temperature acquisition, automatic watering, switchboard control Simple Smart Home Switchboard Control Module)

说明：  通信仿真 实现了PAM调制解调 误码率计算等等功能，有助于各方面学习(Communication simulation realizes the error rate calculation of PAM modulation and demodulation and other functions, which is helpful for all aspects of learning.)

说明：  factorialsss code in c++ and cyclic redundancy check is exceuted in c++

电力最常用的规约的学习资料，包括101,102,103,104，modbus，cdt，其中104还有测试程序，及解析工具；( The most commonly used power statute learning materials, including 101,102,103,104, modbus, cdt, where there are 104 test procedures, and analysis tool )

实用性代码，可以在手机等移动设备上很好的使用，可操作性强。(Usefulness of the code can be very good for use on mobile phones and other mobile devices operable.)

主要关于卷积码的程序实现，有源代码及运行结果。(Convolutional codes is mainly concerned with the program, source code and operating results.)

在实际的调谐解调电路中，采用的是非相干载波解调，本振信号与发射端的载波信号存在频率偏差和相位抖动，因而解调出来的模拟I、Q基带信号是带有载波误差的信号。这样的模拟基带信号即使采用定时准确的时钟进行取样判决，得到的数字信号也不是原来发射端的调制信号，误差的积累将导致抽样判决后的误码率增大，因此数字QPSK解调电路要对载波误差进行补偿，减少非相干载波解调带来的影响。(In the actual tuning and demodulating circuit, non-coherent carrier demodulation is adopted, and the frequency deviation and phase jitter of the local oscillator signal and the carrier signal of the transmitting end are present, and thus the demodulated analog I and Q baseband signals are signals with carrier error.)

说明：  关于ofdm系统中ml检测信号的算法，供大家参考(ML detection algorithm for OFDM system)