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什么是“藍(lán)牙”技術(shù)? What is Bluetooth?
什么是“藍(lán)牙”技術(shù)? What is Bluetooth?
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
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