FDD

(1) (Frequency Division Duplexing) A transmission method that uses separate channels for the uplink and downlink (transmit and receive). If the channel frequencies are adjacent, a guard band may be used between them to reduce interference. Contrast with TDD.

(2) Abbreviation for floppy disk drive. See floppy disk.

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FDD may refer to:

• Floppy disk drive
• Foundation for Defense of Democracies, a policy institute based in Washington, DC.
• Feature Driven Development, a project management approach
• National Council for the Defense of Democracy-Forces for the Defense of Democracy, a rebel group in Burundi
• Frequency-division duplexing, a telecommunications duplex indexing method
• Franchise Disclosure Document (2008) UFDD/UFOC Uniform Franchise Offering Circular

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