digital-modulation-and-demodulation

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.)

说明：  eetop.cn_PLLnoise+jitter_ams model

说明：  lms以及rls对信道进行均衡，实现误差减小，(Channel equalization)

OFDM 同步技术研究 Schmidl_Cox算法 定时估计matlab程序(OFDM the synchronization technology research S&C algorithm timing estimation)

modbus_com 通讯功能，包括PLC程序(modbus_com communication project,include PLC program)

用matlab写的m序列的模糊函数，运行后生成二维和三维仿真图(using Matlab m-sequences written by the fuzzy function after the operation generated 2D and 3D simulation map)

说明：  正交频分复用（OFDM）信号的互补累计函数(ccdf_of_clipped_foltered_ofdm_signal)

基于非线性压扩的降低OFDM信号PAPR的算法(Reduction based on nonlinear companding algorithm for OFDM signal PAPR)

并口通讯，通过并口控制打字机刻在自行车上，防止自行车丢失(Parallel port communication, and by the parallel port control typewriter engraved on the bike, to prevent the a bike to lost)

信源产生、信道编码、调制、信道传输、解调、信道译码、差错比较等通信过程的Simulink仿真方法。分析几种调制方式（2FSK、2PSK、QPSK、16PSK、16QAM）在不同信噪比下的通信质量。(Generated source, channel coding, modulation, channel transmission, demodulation, channel decoding, error comparison of the communication process of the Simulink simulation. Analysis of several modulation (2FSK, 2PSK, QPSK, 16PSK, 16QAM) in different SNR communication quality.)