SINGLE SIDEBAND
Communications Systems Glossary
Communications Systems — Modulation — Amplitude modulation — Single sideband
Information on Single sideband
Suppressing the carrier in an amplitude modulated (AM) waveform produces double sideband (DSB), which will increase the efficiency of the transmission since only the sidebands are amplified. Some inefficiency still remains, however, since the transmission bandwidth must still be twice that of the message bandwidth due to the transmission of both the upper and lower sidebands. These two sidebands are redundant since all the necessary information can be conveyed by only one sideband. When only one sideband is transmitted, the transmission is called single-sideband suppressed carrier (SSBSC) or more commonly SSB. When the upper sideband is transmitted the transmission is called upper side band (USB) and when the lower sideband is transmitted it is called LSB. This reduces the bandwidth of the modulated wave by half and makes it equal to that of the baseband signal. All of the transmitted power then goes toward transmitting the baseband information.
Other topics in our resources on Communications Systems related to Single sideband include:
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