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In telecommunications, a carrier signal, carrier wave, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information.This carrier wave is usually a much higher frequency than the input signal.n the case of single-sideband modulation (SSB), the carrier is suppressed (and in some forms of SSB, eliminated). The carrier must be reintroduced at the receiver by a beat frequency oscillator (BFO).
Radio transmitters work by mixing a radio frequency (RF) signal of a specific frequency, the carrier wave, with the signal to be broadcast. The result is a set of frequencies with a strong peak signal at the carrier frequency, and smaller signals from the carrier frequency plus the maximum frequency of the signal, and the carrier frequency minus the maximum frequency of the signal.