Bluetooth is a universal radio interface in the 2.45GHz frequency band that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to sever other units per piconet. Moreover, each unit can simultaneously belong to several piconets.
What is Bluetooth Technology?
Bluetooth technology which apart from Ericsson, has gained the support of Nokia, IBM, Toshiba, Intel and many other manufacturers eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications.
Technology Characteristics
1Ms/s symbol rate exploits maximum available channel bandwidth
Fast frequency hopping avoids interference
Adaptive output power minimizes interference
Short data packets maximize capacity during interference
Fast acknowledge allows low coding overhead for links
CVSD (Continuous Variable Slope Delta Modulation) voice coding enables operation at high bit- error rates
Flexible packet types supports wide application range
Air interface tailored to minimize current consumption
Basic Technical Information—Based upon a small , high performance integrated radio transceiver ,each of which is allocated a unique 48-bit address derived from the IEEE 802-standard
Operate in the unrestricted 2.45GHz ISM free band, Which is available globally although slight variation of location and width of band apply
Range set at 10m to optimize for target market of mobile and business user
Gross data rate 1Mbit/s with second generation plans to increase to 1Mbit/s
One-to-one connections allow maximum data transfer rate of 721kbit/s (3 voice channels)
Uses packet switching protocol based on frequency hop scheme with 1600 hops/s to enable high performance in noisy radio environments .The entire available frequency spectrum is used with 79 hops of 1Mhz bandwidth , analogous to the IEEE 802.11 standard
Low power consumption longevity for battery powered devices . During data transfer the maximum current drain is 30mA. However during pauses or at lower data rates will be lower中文翻译：
