a)设二进制序列为 1011010010，矩形脉冲，分别画出相应的单极性不归零、 双极性不归零、单极性归零、双极性归零波形。 b)画出 2ASK 2PSK 2FSK 波形-a) set a binary sequence 1011010010, rectangular pulse, respectively, draw the corresponding NRZ unipolar, bipolar not zero, zero unipolar, bipolar zero wavefo

调制信号的识别。比如2ASK,2PSK,2FSK 、QAM等调制方式的信号识别。-Identification of the modulation signal.For example 2ASK, 2PSK, 2FSK, signal recognition QAM modulation scheme.