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引言如果节省带宽是选择传输抑制边带(ω_1至ω_2)信号S(t)(它不能以其原有频带方便地传输)方法的主要准则,则单边带传输便成为最佳的可取方法;因为单边带的上边带S_u(t)及下边带S_L(t)的带宽都与S(t)的带宽相等。然而,目前还没有直接产生单边带信号或直接解调(接收)单边带信号的方法及设备,即没有直接进行频率转换(能或不能将频率倒置)的方法。所有已知的方法
Introduction If bandwidth savings are the primary criterion for the choice of transmission suppression sideband (ω_1 to ω_2) signal S (t) (which can not be easily transmitted in its original frequency band) single-sideband transmission is the preferred approach; Because the bandwidth of the upper sideband S_u (t) and the lower sideband S_L (t) of the single sideband are equal to the bandwidth of S (t). However, there is no method and apparatus for directly generating a single sideband signal or directly demodulating (receiving) a single sideband signal, that is, there is no method of directly performing frequency conversion (with or without frequency inversion). All known methods