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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).
Carrier signal can be defined as a high frequency signal that is modulated by the modulating or the information signal. This carrier signal increases the range and distance the information signal can travel. Along with the distance carrier signal also improves the signal quality. To understand this we can consider a carrier signal as some bus, train, an aeroplane or any transport vehicle i.e. a carrier of some sort and the information signal as the passengers of the carrier. See it this way, a person can walk comfortably for a few kilometers.