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Definition of "overlay" |
(1) in wireless communications, refers to a modulated signal (communication scheme) that occupies an RF channel that is already occupied by other signals. The classical example is that of a spread spectrum signal that is (spectrally) placed on top of a set of narrow band channels that carry narrowband signals. The wideband spread spectrum signal has a low power spectral density, hence the overlay scheme can coexist with the narrow band signals occupying the frequency band. |
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