July 2010
Intermediate to advanced
350 pages
14h 19m
English
Content preview from Smart Phone and Next Generation Mobile Computing
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Supporting Wireless Technologies 169
Key components are discussed to explain how Bluetooth supplies
desired data services as follows.
3.11.4 Radio and Baseband
The radio layer of Bluetooth utilizes the 2.4-GHz ISM band, the
globally free available frequency band, for spread spectrum com-
munication. Seventy-nine MHz of bandwidth is used for frequency
hopping, with 1-MHz carrier spacing. The modulation scheme is
GFSK at a rate of 1 bit per Hz, providing a data rate of 1 Mbps. The
frequency-hopping rate is 1600 hops per second with a dwell time of
625 µsec. As a WPAN, the radio interface of Bluetooth imposes strict
emitted power control. Three classes of transmitters are defined based
on power and signal transmission range.
•
Class 1 outputs a maximum of