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The engineer explained how quadrature amplitude modulation increases spectral efficiency by encoding bits in both the amplitude and phase of two carriers.
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The engineer explained how quadrature amplitude modulation increases spectral efficiency by encoding bits in both the amplitude and phase of two carriers.
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Related words
quadrature amplitude modulation
Noun
countable
uncountable
Japanese Meaning
二つの搬送波に対して同時に振幅変調を施すことでデータを伝送する変調方式。これら二つの搬送波は通常、正弦波を用い、互いに90度の位相差を持つ直交状態にあるため「直交振幅変調」と呼ばれ、一般にQAMと略される。
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