📖 6. Multiplexing and Spectrum Spreading

📖 From Data Communication and Networks • 180 questions available

About 6. Multiplexing and Spectrum Spreading

Multiplexing is a set of techniques that allows multiple signals to be transmitted simultaneously over a single data link, maximizing bandwidth utilization and reducing infrastructure costs. Frequency Division Multiplexing (FDM) separates signals by frequency bands for analog applications, Time Division Multiplexing (TDM) allocates fixed time slots for digital streams, and Wavelength Division Multiplexing (WDM) applies FDM principles to optical fibers, enabling massive capacity in backbone networks.

Spectrum spreading takes a different approach by distributing a signal across a wider bandwidth than strictly necessary, primarily to enhance security, resist jamming, and reduce interference. Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS) are key techniques used in Wi-Fi, Bluetooth, and military communications, allowing multiple users to share the same frequency band with minimal collision while providing inherent protection against eavesdropping and narrowband noise.

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🔄 Last updated: 2026-07-31