超宽带信号中高斯脉冲和冲击脉冲的产生，以及脉冲位置调制（PPM)和脉冲幅度调制(PAM)，形成一个完整的电路来完成整个过程-UWB signal in the Gaussian pulse and impulse generation, and pulse position modulation (PPM) and pulse amplitude modulation (PAM), to form a complete circuit to complete the whole process