Bluetooth is a universal radio interface1 in the 2.45GHz frequency band that enables portable electronic devices to connect and communicate wirelessly2 via short-range, ad hoc networks. Each unit can simultaneously3 communicate with up to sever4 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, modems5, headsets, PDAs, Computers, printers, projectors6, 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 hopping8 avoids interference
Adaptive output power minimizes interference
Short data packets maximize capacity during interference
Fast acknowledge allows low coding overhead for links
CVSD 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 Informationbased upon a small , high performance integrated radio transceiver ,each of which is allocated10 a unique 48-bit address derived11 from the IEEE 802standard .
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 optimize12 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
Uses packet switching protocol13 based on frequency hop7 scheme with 1600 hops14/s to enable high performance in noisy radio environments .The entire available frequency spectrum15 is used with 79 hops of 1Mhz bandwidth , analogous16 to the IEEE 802.11 standard
Low power consumption longevity17 for battery powered devices . During data transfer the maximum current drain is 30mA. However during pauses or at lower data rates will be lower
蓝牙是一个频率为2.45GHz的通用无线电通信接口，它通过一个特殊的互联网可以在各种便携设施之间打造起无线连接并进行短程通信。在一个微微网中，每一个单元都能同时与其它各单元进行通信。而且，每个单元可以同时是几个微微网。
什么是蓝牙技术?
蓝牙技术最早是由爱立信开始研制的，目前已经得到了诺基亚、IBM、东芝、因特尔及很多其它有关制造厂商的支持。其目的是为了免除在无绳电话或移动电话、调制解调器、头套式送/受话器、PDAs、计算机、打印机、幻灯机、局域网等之间加装电线、电缆和连接器。而且，这种技术可以延伸到那些完全不一样的新设施和新应用中去。蓝牙的技术特质以每秒1M个码元的字符速率传输，充分借助信道的最大有效带宽.
迅速跳频防止干扰
可变的电源输出使干扰减小到最小
使用短数据包传输增强抗干扰能力
迅速确认允许有附加低速率的编码被发送到链路上
连续可变斜率增量调制的语音编码可以在高误码率的状况下正常工作
