Digital natural sampling based SPWM overcomes the disadvantage which is hard to apply to multilevel-inverter of high modulation frequency and high precision synchronously for microprocessor realizing SPWM waveform. SPWM数字化自然采样法克服了微处理器实现的SPWM波形很难同时应用于高调制(HM)频率和高精度的多电平逆变器中的缺点。
The modulation response function, demodulation response function and demodulation response factor are analyzed by small_signal analysis. It is found there are peak values about 60 MHz and the response functions and the demodulation factor decrease at high modulation frequency. 小信号调制分析了系统混沌调制响应函数和解调响应函数以及解调因子,系统的调制解调响应函数以及解调因子在60MHz有一个峰值,系统在高频调制时,响应函数和解调因子明显下降。
QAM ( Quadrature Amplitude Modulation ) has been widely used in various digital communication systems due to its high modulation efficiency. 正交幅度调制(QAM)具有较高的调制效率,被广泛应用于各种数字通信系统中。
The main purpose is to study further in the constant envelope and Quasi-constant envelope modulations with high modulation efficiency. 深空大视场弱小目标的实时检测方法主要研究适合深空信道传输的具有恒定或准恒定包络的高效数字调制方式与直接序列扩频相结合的组合调制解调方式。
This device can be applied as a modulator or chopper in optical fiber signal transmission system and has a good prospect for its high modulation ratio and low price. 具有价格低廉、调制度高的特点,可应用于光纤传输信号的调制及信号斩波等。