Single-sideband suppressed-carrier is a telecommunication transmission mode, which belongs to amplitude modulation.

The information represented by the modulating signal is contained in both the upper and the lower sidebands. Since each modulating frequency f(1) produces corresponding upper and lower side-frequencies

f(c) + f(i)

or

f(c) − f(i')

it is not necessary to transmit both side-bands. Either one can be suppressed at the transmitter without any loss of information.

Advantages

• Smaller transmitter power
• Smaller bandwidth (one-half that of a DSB)
• Less noise at the receiver
• Size, weight and peak antenna voltage of the SSB transmitter are significantly less than those for the standard AM transmitter.

Generation

Diagrams are to be included.

SSB is obtained by selecting the wanted sideband (either USB or LSB) in a DSB-SC AM by means of a suitable bandpass filter BPF.

The sidebands are shown as triangles only to illustrate the mirror image relationship between the sidebands.

See also

• single sideband modulation

Waves