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1.当占空系数为无穷大的数字信号沿具有理想频率特性的信道传输,并且同步绝对准确时,传输速度只受起伏噪声的限制,在接收端的取样时刻不存在码元间干拢。这时要求信道截止频率的倍频2F_c比于节拍频率F_T为整数。现在先引入一些描述传输系统的基本标志。低频理想信道的频率特性K(F)和(?)(F)具有以下形式:
1. When the digital signal with infinite space factor is transmitted along a channel with ideal frequency characteristics and the synchronization is absolutely accurate, the transmission speed is limited only by the fluctuation noise. There is no inter-symbol interference at the sampling time of the receiving end. In this case, it is required that the multiplier 2F_c of the channel cutoff frequency be an integer with respect to the beat frequency F_T. Now introduce some of the basic symbols describing the transmission system. The frequency characteristics K (F) and (?) (F) of the low frequency ideal channel have the following form: