DoppelSeitenbands

DoppelSeitenbands, a term of German origin meaning "double sidebands," refers to a method of radio communication where both the upper and lower sidebands of a modulated signal are transmitted. This is in contrast to single-sideband (SSB) transmission, which deliberately suppresses one of the sidebands and often the carrier wave.

In amplitude modulation (AM), when a carrier frequency is modulated by an information signal, two sidebands are generated. The upper sideband contains frequencies above the carrier, and the lower sideband contains frequencies below the carrier. Both sidebands carry the same information. DoppelSeitenbands transmission transmits both of these, along with the carrier. This results in a wider occupied bandwidth compared to SSB.

The primary advantage of transmitting double sidebands is the simplicity of the transmitter and receiver circuits. Standard AM radios, for instance, are designed to receive double-sideband signals. However, this comes at the cost of power efficiency and spectral efficiency. Since both sidebands contain redundant information and the carrier itself contributes no intelligence, a significant portion of the transmitted power is not carrying useful information. This makes DoppelSeitenbands less efficient in terms of both power usage and the amount of information that can be packed into a given frequency spectrum compared to SSB. Despite these drawbacks, DoppelSeitenbands remains in use for certain applications, particularly in broadcasting, due to its compatibility with existing, simpler receiver technology.