Features of bluetooth technology Essay

The logotype for Bluetooth is based on Runes surrounding the subtitle of Harald Bluetooth. Bluetooth the technology is based on converse theory central to mans witness personal space. Fundamentally Bluetooth operates within the Industrial, scientific and Medical (ISM) border at 2. 4 gigacycle. It is a short-range wireless communication stock(a) defined as crinkle replacement for a Personal country Network (PAN) (see Bluetooth. Grolier cyclopaedia of Knowledge, pp. 87-94). invention 1 is the Bluetooth Logo. A c satisfactory replacement standard has been defined because cables limit mobility of the consumer they atomic tot up 18 clunky to carry near, argon easily unconnected or broken.Often connectors are addicted to difficult to diagnose failures or are proprietary. To counteract these limitations Bluetooth is designed to be demoralize and portable. It stool be embedded to evolve the riggers of physical knocks and shocks. It includes standards and protocols to ma ke it mobile, robust, real and not limited to unrivaled manufacturer (see Bluetooth. Grolier Encyclopedia of Knowledge, pp. 87-94). The operating band as well as fits the goals of Bluetooth, awful requirements as a cable replacement. The damage needs to be comparable with cable. Reductions can be achieved by operating in the licence free 2.4 GHz ISM band, keeping backward compatibility wherever possible lowers the cost of ownership by avoiding upgrades and having a relaxed radio judicial admission enables whiz chip integrated circuit solutions. It also needs to be as reliable and resilient as cable and share with errors and degradation ca utilise by interference. For mobile arts it essential be compact, lightweight, low power and prosperous to use (see Bluetooth. Grolier Encyclopedia of Knowledge, pp. 87-94). A. 1 relative relative frequence Hopping We have addressed the reasons for the Bluetooth without delving into the nuts and bolts of the technology to discover ho w it operates.For the majority of countries the ISM band used by Bluetooth is available from 2. 40-2. 4835 GHz, although almost countries impose restrictions. In this band Bluetooth uses frequency Hopping Spread Spectrum (FHSS) techniques in order to reform its immunity from interference (see J. Bray and C. F. Sturman, Bluetooth touch on Without Cables, apprentice Hall). In unrestricted countries the radios decamp-skip in pseudo random ranges around all available channels, this equates to 79 RF channels with a channel set of 1 megahertz.Starting at a base frequency of 2402 MHz whence the frequency of the channels, f, can be evince as f =2402 + n MHz where, n, is the channel number with an integer survey in the range of 0 to 78. In restricted countries a limited frequency hopping schemes with just 23 channels is used and is catered for in the Bluetooth specification. Both hopping schemes have a 1 MHz channel place making it possible to design a simple radio interface wher eby the baseband and has to specify a channel number and the radio multiplies this up to the appropriate frequency offset (see J.Bray and C. F. Sturman, Bluetooth unify Without Cables, Prentice Hall).In this FHSS scheme there are 1600 hop per second, which is a hop every 625 s. check of this hop timing is taken up by the guard age of 220 s allowing the synthesizer eon to settle. The frequency hopping implements time division multiplexing as shown in Figure 2. The basis of the scheme has the Master device transmitting in the first 625 us slot, k, and here the hard worker receives. In the near slot k = 1 the Slave is permitted to transmit and the winner listens (see J.Bray and C. F. Sturman, Bluetooth Connect Without Cables, Prentice Hall).Figure 2 Frequency Hopping, master and slave interact on be slots The radio must be able to retune and stabilise on a freshly frequency within tight time constraints. This is pushed pass on when establishing a connection the hop rate ca n be pint-sized to every 312. 5 us. As the radios are constantly hopping to different radio channels, this ensures that packets alter by interference on one channel can be retransmitted on a different frequency channel.To further enhance resilience both ARQ (Automatic tell reQuest) and FEC (Forward Error Correction) form part of the specification (see J. Bray and C. F. Sturman, Bluetooth Connect Without Cables, Prentice Hall). genius drawback with the normal hop sequence is the time taken for production testing. Bluetooth ensures adequate frequency coverage with a test sequence allowing the radios to be tested at a faster rate (see J. Bray and C. F. Sturman, Bluetooth Connect Without Cables, Prentice Hall).