The goal is to achieve the highest data transmission speed of 1Mbps (effective transmission speed of 721kbps), the maximum transmission distance of 10 meters, the user does not have to be permitted to use the 2.4GHz ISM (Industrial, Scientific, Medical) band, on which the establishment of 79 channels with a bandwidth of 1MHz, with the frequency of 1,600 switching per second, the hobbing () method. Hobbing) way of spectrum diffusion technology to realize the sending and receiving of radio waves. This is the origin and characteristics of Bluetooth technology. Devices that communicate using Bluetooth technology are divided into a "calling party" that decides the frequency of the hobbing mode, and its communication counterpart, the "receiving party". The calling party can communicate with 7 receiving parties at the same time. Therefore, it is possible to connect the caller and seven recipients***8 devices into a subnet called Piconet (sawtooth network), and the recipients in a Piconet can be the recipients of more than two Piconets at the same time. in July 1999, Bluetooth announced the official specification of BluetoothVersion 1.0, and cell phones and notebook PCs complying with this specification will be available by the end of 1999 or 2000, and will be available by the end of the year. laptops will be available in late 1999 or early 2000. The number of companies claiming to productize Bluetooth technology is growing, with membership in the Bluetooth standardization group, the BluetoothSIG (Special Interest Group), now numbering more than 800.
"Bluetooth" technology is designed to smart cell phones and laptops, handheld computers, and a variety of digital information devices can no longer use cables, but a small, low-cost wireless communications technology to connect up; and then form a personal side of the network, so that a variety of information technology within the scope of the mobile portable devices can be seamlessly realize the resources **** enjoy. According to foreign authorities expect, a few years later, the world will have hundreds of millions of digital cell phones, PCs and a variety of information equipment will be based on Bluetooth technology wireless interface as a standard configuration. Bluetooth technology will be in a variety of areas of rapid development, its typical application environment, including wireless office environment (Wireless Office), the automotive industry, medical equipment, etc. Bluetooth will play an important role in people's daily lives and work, the market potential is huge, the technology is becoming the 21st century investment hot spot.
The so-called Bluetooth (Bluetooth) technology, in fact, is a short-range wireless communication technology, the use of "Bluetooth" technology, can effectively simplify the Pocket PCs, notebook computers and cell phones and other mobile communication terminal equipment, communication, but also successfully simplify the above equipment and the Internet communication, so as to simplify the communication between the above equipment and the Internet. It can also successfully simplify the communication between these devices and the Internet, thus making the data transmission between these modern communication devices and the Internet more rapid and efficient, and widening the way for wireless communication. To put it plainly, it is the Bluetooth technology makes some modern easy to carry mobile communication equipment and computer equipment, do not have to resort to cables on the network, and can realize the wireless Internet, and its practical applications can also be expanded to a variety of home appliances, consumer electronics and automotive and other information appliances, composed of a huge wireless communication network.
"Bluetooth" is the formation of the background is this: in May 1998, Ericsson, Nokia, Toshiba, IBM and Intel Corporation and other five well-known manufacturers, in the joint standardization of short-range wireless communications technology activities proposed the Bluetooth technology, its purpose is to provide a short-range, low-cost wireless transmission The purpose was to provide a short-range, low-cost wireless transmission technology for applications. These five vendors also established the Bluetooth Special Interest Group to enable Bluetooth technology to become the future standard for wireless communications. Chip juggernaut Intel was responsible for the development of semiconductor chips and transmission software, Ericsson was responsible for the development of wireless RF and cell phone software, and IBM and Toshiba were responsible for the development of interface specifications for notebook computers.In the second half of 1999, well-known industry giants Microsoft, Motorola, Sankon, Lucent, and the five Bluetooth Special Interest Group companies*** co-sponsored the establishment of the Bluetooth Technology Promotional Organization (BTPO), thereby creating a The world set off a wave of "Bluetooth" boom. The global industry is about to develop a large number of Bluetooth technology applications, so that Bluetooth technology presents an extremely broad market prospects, and predicts that the beginning of the 21st century will usher in a magnificent wave of global wireless communications.
What is Bluetooth?
Bluetooth (Bluetooth) is by Toshiba, Ericsson, IBM, Intel and Nokia in May 1998 **** with the proposed close-range wireless data communications technology standards. It can realize single-point-to-multipoint wireless data and sound transmission within a 10-meter radius, with a data transmission bandwidth of up to 1 Mbps. The communication medium is an electromagnetic wave with a frequency between 2.402 GHz and 2.480 GHz.
Bluetooth communication technology features
■Bluetooth work in the global open 2.4GHz ISM (i.e., industrial, scientific, medical) band;
■Using frequency-hopping spectrum expansion technology, the frequency band is divided into a number of frequency-hopping channels (hop channel), in a connection, the radio transceiver according to a certain code sequence continuously from a channel "hop" from one channel to another in a certain code sequence;
■A Bluetooth device can establish a connection with seven other Bluetooth devices at the same time;
■Data transfer rate of up to 1Mbit/s;
■Low-power consumption, communication security is good;
■Can be over the obstacles within the effective range of the Connection, there is no special communication perspective and direction requirements;
■Support voice transmission;
■Simple and convenient networking
Bluetooth communication technology
Bluetooth technology is an emerging technology, has not yet been put into widespread use, many Bluetooth devices are still in the laboratory test phase. However, it is certain that most of the devices with infrared wireless data communication function can use Bluetooth technology to realize wireless connection in the future. At the same time, the network characteristics of Bluetooth technology and voice transmission technology so that it can also realize the infrared technology can not be achieved in some specific functions, such as wireless phones, multi-device networking and so on.
Manufacturers and consumer acceptance
Bluetooth technology has gained the response of more than two thousand enterprises, which has a huge development and production capacity. Bluetooth has already possessed a high degree of popularity, and the majority of consumers are very interested in this technology.
Implantation cost
Currently on the market Bluetooth devices are still relatively rare. USB interface Bluetooth adapter, Bluetooth PC card and Bluetooth cell phone have been market-oriented products, the price is very high. This shows that the early development stage of Bluetooth implantation costs are still relatively high. However, it is estimated that the implantation cost can be under 30 dollars after batch production. In the period of mature development of Bluetooth technology, the implantation cost should be able to control within 10 dollars.