Carrier Wave

Carrier waves are used when transmitting Radio signals to a radio receiver.

Frequency Modulation (FM) and Amplitude Modulation (AM) signals are both transmitted with the help of carrier waves.

In 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).

The frequency for given radio station is actually the carrier wave's Center Frequency .

CW EMISSION: LESS USED BY MODERN MODULATION SYSTEMS

Newer forms of radio communication, such as Spread Spectrum and Ultra Wide Band , do not transmit a conventional carrier wave, nor does the European standard for HDTV , known as COFDM .

COFDM should be thought of as an array of symmetrical carrier waves. The rules governing carrier wave propagation affect COFDM differently than 8VSB .

Some forms of Spread Spectrum transmission and most forms of Ultra Wide Band transmission are mathmatically defined as being devoid of carrier waves.

In Telecommunication , the term carrier ('''cxr''') or '''carrier wave''' has the following meanings:

# A Waveform suitable for Modulation by an Information -bearing Signal .

# An unmodulated or a uniform or predictable series of pulses. ''Synonym:'' carrier wave.

# Sometimes employed as a Synonym for a Carrier System , or a Synonym for a telecommunications provider company (operator), such as a Common Carrier .

Source: mostly from Federal Standard 1037C and from MIL-STD-188

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Carrier Wave