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2.0 Bluetooth Mechanism:

By embedding short-range transceivers that are inexpensive and tiny, into new electronic devices that are available nowadays, Bluetooth achieves its goal. In addition to three voice channels, Bluetooth can transfer data at data transferring speed up to 721 Kbps. As Bluetooth operates on radio band, at frequency of 2.45 GHz, that is unlicensed and globally available, people or “international travelers” have no obstructions to use Bluetooth-enabled equipment. Moreover, Bluetooth units might be either externally adapted or built into electronics devices. E.g. in a personal computer, Bluetooth devices can be built into the motherboard as a PC card or on the other hand it can be used as an external Bluetooth adaptor through connecting it to a USB port. From the IEEE 802 standard, each Bluetooth device has its own 48-bit address. One feature is that connections are not only point to point, but they can also be multipoint connections. Usually, Bluetooth devices have a maximum range of connection up to 10 meters. However, by increasing the power, the range of connection might be extended to 100 meters. Bluetooth devices have a technique called frequency hopping. The main purpose of this technique is to protect the devices from radio interference. The mechanism of the technique is that Bluetooth devices change arbitrarily their frequency maximally 1600 times/s. when an error occurs, it will be immediately corrected by the three complimentary error correction schemes that any Bluetooth device has. Bluetooth devices are also provided with built in verification and encryption.

When Bluetooth devices are in a “hold” mode they consume approximately 30 micro Amperes from the battery of the electronic devices, such as cell phones and laptops, while they consume a range of 8 to 30 milliamps, less https://www.51lunwen.org/StudentPapers/ than one tenth of a watt, when they are in the active transmission mode. Moreover, only 0.3 mA are consumed by the radio chip, when in a standby mode, which means that it's less than 3 % of the power that is used by a mobile phone. Also, the radio chip has an excellent power-saving feature that is as soon as the traffic volume lessens, the chip shifts automatically to a low-power mode. The above indicates that Bluetooth devices do not drain precious battery life.

But beyond un-tethering devices by replacing the cables, Bluetooth devices can form a small and private ad hoc grouping of devices that are away from fixed network infrastructures by providing universal bridges. These bridges are to connect between a device, data networks and a peripheral interface. Furthermore, noisy radio frequency environment does not affect Bluetooth devices since they are designed to use a scheme called frequency hopping scheme and as well as a fast acknowledgment in order to make the link active and strong. After sending or receiving a packet, Bluetooth radio modules keep away from interference from other radio signals by jumping “hopping” to a new frequency. The Bluetooth radio uses shorter packets and jumps “hops” faster than other systems that are operating in the identical frequency band the thing that makes the Bluetooth radio more active and stronger than other systems. In addition, these fast hopping from a frequency to another and the short packages decreas本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。