Single-sideband modulation
![Illustration of the spectrum of AM and SSB signals. The lower side band (LSB) spectrum is inverted compared to the baseband. As an example, a 2 kHz audio baseband signal modulated onto a 5 MHz carrier will produce a frequency of 5.002 MHz if upper side band (USB) is used or 4.998 MHz if LSB is used.](/Images/godic/202502/19/SSB_bandform.svg2157.png")
![Frequency-domain depiction of the mathematical steps that convert a baseband function into a single-sideband radio signal.](/Images/godic/202502/19/Single-sideband_derivation2157.png")
![A Collins KWM-1, an early Amateur Radio transceiver that featured SSB voice capability](/Images/godic/202502/19/Collins_KWM-12157.jpg")
![VSB modulation](/Images/godic/202502/19/VSB_bandform.svg2157.png")
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a refinement of amplitude modulation which uses transmitter power and bandwidth more efficiently. Amplitude modulation produces an output signal that has twice the bandwidth of the original baseband signal. Single-sideband modulation avoids this bandwidth doubling, and the power wasted on a carrier, at the cost of increased device complexity and more difficult tuning at the receiver.