Bluetooth radio system uses the Frequency Hopping Spread-Spectrum (FHSS) and Time Division Duplexing (TDD) for transmitting and receiving packets at 79 different channels at 1,600 hop per/sec. The Bluetooth devices must be properly synchronized so that they can hop together from channel to channel using the same channel set as well as the same hopping sequence within that channel set along with the time synchronization.
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