A graphical user interface (GUI) is an interface through which a user interacts with electronic devices such as computers, hand-held devices and other appliances. This interface uses icons, menus and other visual indicator (graphics) representations to display information and related user controls, unlike text-based interfaces, where data and...
A guard band is a narrow frequency range that separates two ranges of wider frequency. This ensures that simultaneously used communication channels do not experience interference, which would result in decreased quality for both transmissions.
Guard bands are used in frequency division multiplexing (FDM).
A spectrum's unused portion is intended to prevent crosstalk, or noise or interference from other modulated signals on the same transmission medium, such as AM or FM radio.
The guard band concept applies to wired and wireless communications. It also simplifies the process of signal filtering for hardware, software or both.
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