In recent years, the bandwidth efficiency of Ultra Narrow Bandwidth (UNB) technologies, represented by Very Minimum Shift Keying (VMSK), has reached near a 100 bps/Hz.

• 近年来,以甚小移键控调制(VMSK:Very Minimum Shift Keying)为代表的超窄带(UNB:Ultra Narrow Bandwidth)技术的带宽效率已达100bps/Hz。