...过90度相差解调变器(Quadrature Demodulator )后,信号被解调成Rx_I与Rx_Q,然后通过用来做波形整形及控制频谱遮罩(Spectrum Mask)的7.7MHz,5阶的Lowpass Butterworth滤波器;此低通滤波器是与发射路径中的低通滤波器是同一个,也就是说发射路径与接收路径共用一个...
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The algorithm is verified by experiments and the modulator can produce digital modulation signals with good EVM(Error Vector Magnitude) and spectrum mask.
通过验证，所产生的调制信号具有良好的误差向量幅度（EVM）和频谱特征。
UWB signals and their power spectrum mask are important factors which need to be considered when studying the spectrum coexisting and compatible problems between UWB systems and other radio systems.
超宽带(uwb)信号及其功率谱分布是研究超宽带通信系统与其它通信系统频谱共存与兼容问题时，需要考虑的重要因素。
The precise size filter is deposited with the mask method successfully, the spectrum characteristic is tested through utilizing the optical fibre spectrometer.
通过采用光学掩膜的方法成功制备了符合设计尺寸要求的可见光滤光片，并利用光纤光谱仪测试了滤光片的光谱特性。
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