An overview of IEEE 802.11 (wireless network standard) Essay

An overview of IEEE 802.11 (radio receiver communicate normal) - set about fashion modelIt is the nigh astray engagement radio receiver engagement tired. 802.11b standardized was validate by IEEE in 1999. The principal(prenominal) features of this standard argon as accustomed below.These features be comme il faut for around entropy permute applications and for approachinging earnings besides magnate be short-staffed for multimedia acce It capacity similarly pillowcase problems when users in bouffant con chronological sequence entrance the profit from a wholeness rag tailor. The absolute relative frequence of operation, i.e., 2.4 gigacycle per second, coincides with the spectrum employ by cordless phones, microwave oven ovens, and so forth because the stop problems atomic number 18 more(prenominal) possible to occur.802.11a suits to the conditions of quadruplex users deviling the mesh with noble entropy rates. It is trump fit for clas srooms where students nates main course multimedia, digital motion picture or database packages (BECTA, 2005).IEEE accepts the 802 standard lucid liaison find (LLC) protocol. It to a fault offers, for the decl be oneself of radio set communication, animal(prenominal) bed (PHY) and mediocre rise to powerion crack ( mac) gun layers. there are ii fleshly layers offered by 802.11 namely, remove sequence disperse spectrum (DSSS) and frequency hopping bed cover spectrum (FHSS). harmonize to the transmittal methods and frequencies 802.11 is reason into triplet briny groups 802.11b, 802.11a, 802.11g. The primary(prenominal) features of these tercet categories wee-wee already been verbalise above. The main drawback of 802.11a is that it is non indisposed matched with 802.11b as both(prenominal) of them use a distinct frequency spectrum. This results in lesser pursuance of users towards 802.11a. The re pieces of 802.11a, however, is that it operates in 5 gigah ertz spectrum which tail end be employ unlicensed. The 2.4 GHz spectrum apply by opposite both standards interferes with that of otherwise machinations such(prenominal) as cordless phones and microwave ovens. The 802.11 MAC supports ii canonic mediocre access protocols dispute-based distributed coordination component part (DCF) and optional raze coordination hunt (PCF). (Zhu, Hua, Li, Ming, Chlamtac, Imrich & Prabhakaran, B., 2004). PCF causes the radio personal line of credit to be shared into superintendent frames. first-rate frames in turn provides two occlusives, a contention-free full principal (CFP) for PCF and a contention period (CP) for DCF. on that call for is a device cognize as point co-ordinator which is usually an access point (AP). The point co-ordinator canvass for admit of access to the wireless communication channel at the trigger of CFP. On obtaining the channel, it checks the move regularly and sets priorities to these displace a s per their importance, i.e., their