QAM Meaning and
Definition
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Quadrature Amplitude Modulation (QAM) is a digital modulation scheme used for transmitting data signals over a communication channel. It is a combination of both amplitude modulation and phase modulation, where both amplitude and phase of a carrier signal are altered to encode the information being transmitted.
In QAM, a large number of discrete levels or states are used to represent digital data. These levels are commonly expressed as points in a two-dimensional signal constellation diagram, which is divided into quadrants. Each point in the diagram corresponds to a specific combination of amplitude and phase of the carrier signal.
QAM employs two carrier waves in quadrature phase (90 degrees apart), which are modulated independently with distinct data streams. This allows for the transmission of two digital bit streams simultaneously, increasing the data rate or capacity of the channel. The constellations on both the in-phase and quadrature components are typically arranged in a rectangular grid pattern.
QAM is widely used in various digital communication systems, including wireless communication, cable television, satellite communication, and broadband networks. It offers high data transmission rates and efficient use of bandwidth, making it suitable for applications requiring high-speed data transfer. The specific number of levels or states used in QAM determines the data rate and signal quality, with higher-order QAM schemes providing greater capacity but also greater susceptibility to noise and interference.
Common Misspellings for QAM
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