ZIGBEE

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IEEE 802.15.4 - WPAN

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???? ZigBee
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SPREAD SPECTRUM
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1. ????? ???? ?????
2. ????? ??' ?????? ?? ???? ?????
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1. ????? ???? (Anti-Jam)
2. ????? ?????? ?????? (Interference Avoiding)
FHSS Frequency Hopping Spread Spectrum
DSSS Direct Sequence Spread Spectrum
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DSSS Direct Sequence Spread Spectrum
????? Spread ?????
Anti Jam
????? De-Spread ?????
Interference Avoiding
SNR
TX Range
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ZigBee MAC Format
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1. Non-Beacon Mode (UnSlotted CSMA/CA)
2. Beacon Mode (Slotted CSMA/CA)
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Beacon Mode Network
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POWER
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POWER
????? Spread\De-Spread
POWER
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POWER
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POWER
???? ?????? (Beacon Mode)
POWER
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