Bluetooth
Bluetooth
Bluetooth
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<strong>Bluetooth</strong><br />
• Data rate<br />
– 720 Kbps (v.1), 2.1 Mbps – 3 Mbps (v.2 with EDR – Enhanced Data<br />
Rate)<br />
• Radio technology: Frequency Hopping Spread Spectrum<br />
– Chop up the data being sent into smaller datagrams<br />
– Transmit them using multiple channels defined by different frequency frequency<br />
hopping sequences (pseudo-random (pseudo random order)<br />
• 1600 hops/sec over 79 frequencies<br />
• Carrier frequency changed at every packet transmission<br />
– Why?<br />
– Time/slot synchronization<br />
• Automatically locates each other, but requires user action to form form<br />
network<br />
• <strong>Bluetooth</strong> network<br />
– Piconet<br />
– Scatternets<br />
Nguyen Tuan Nam/WNC 2010 4
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