ACompatible sideband transmission, also known asamplitude modulation equivalent (AME) orSingle sideband reduced-carrier (SSB-RC), is a type ofsingle sidebandRFmodulation in which thecarrier is deliberately reinserted at a lower level after its normal suppression to permit reception by conventional AM receivers. The general convention is to filter the lower-sideband, and communicate using only the upper-sideband and a partial carrier.[1]
The benefits of compatible-sideband over conventional AM are increasedspectral efficiency due to a reduction in bandwidth of 50% as well as a decrease in wasted power. By using compatible sideband instead of AM, less RF power is required at the transmitter to transmit the same quality of signal the same distance. This results in compatible sideband being almost 100% power-efficient, where regular AM is comparably only 16% power-efficient (84% of RF power wasted).[2]
This modulation was first used bythe first West-German longwave transmitter between 1953 and 1962, which worked on 151 kHz and is currently mostly used inhigh frequency military communications.
This article incorporatespublic domain material fromFederal Standard 1037C.General Services Administration. Archived fromthe original on 2022-01-22. (in support ofMIL-STD-188).
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