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Abstract — The IEEE 802.11n is an emerging technology that has very high throughput WLAN stanar !hich coul achieve ata rates up to "00 #$ps in 2.% &'( or ) &'( $an !ith a channel $an!ith o* 20 #'( or %0 #'(. In This paper !e invest igat e the at a thr oughput per* ormance o* IEE E 802.1 1n in mul tiple input mul tipl e out put +#I#,- ortho gonal *reuency ivision multiple/ing +,#- system. A list o* suspect parameters is analy(e in this paper to assess thei r e**e ct on per*ormance o* the IEEE 802. 11n phy sica l layer taen as an appli cat ion o* #I#, technol ogy . The scheme uses $ina ry phase shi *t e ying +3456-7 uarat ure phase shi* t e yi ng + 456- an uaratu re ampl itue moulation +A#- techniue uner Aitive !hite &aussian noise +AW&N- channels. 5imulation results sho! a signi*icant per*ormance o* $it error rate +3E9- an pacet error rate +4E9- epening on the channel selection. Index Terms — #I#,7 ,#7 IEEE802.11n7 4ac et Error 9ate7 throughput. I. I NTRODUCTION The communication de vel opment of the twent y- fir st century is fa ci ng an ind icati on of the loca l wi re le ss networs. !eople want to "e connected everywhere and all the time. This is the reason of giant popularity of wireless local area networs. The physical layer #!$%& design of wi re le ss sy ste ms has to ma nage wi th the co mp le ' interaction "etween analog radio fre(uency hardware that operates at carrier fre(uencies in some )$* range and the dig ita l "a se "and har dwar e whic h pe rf or ms comple ' algori thms lie viter"i-d eco ding+ filte ring+ pulse shaping fa st fo ur ier tr ans form #, ,T& etc /. The de mand fo r fle'i"ility has initiated a convergence of several wireless standards in very small porta"le devices. The I000 123.n is a currently emerg ing wireless l ocal 4r ea net wor #564N& stan dard capa" le of pro viding dramatically inc reased throughput + as well as improved range+ reduce d signa l fa ding + ove r the e'is ting I000 123.a7"7g 564N standards. To reali*e a wide range of services at high rate with high "andwidth and (uality of serv ices #8o9 & assu rance+ the I000 123.n is prese nted which adopts :I :O-O,D: technology 3/. The research shows that :I:O-O,D: system can transmit information with higher data rate and "etter 8o9. Therefore+ the I000 123.n will "e a"le to reach data rates of ;22 :"ps+ and it guarante es a mi nimu m of 22 :"p s of throughput+ mea nwh ile+ it dep res ses the Int er-9 ym"ol Int erf ere nce caused "y mu lti-pa th fa di ng+ enha nces imme ns el y transmi ssi on per for mance of wi rel ess communica tion system. In order to simulate new characteristics of 123.n physical layer+ 123.n Tas )roup #T)n& considers and proposes si' inds of channel model applied to adapt to dif fer ent enviro nmen ts </ . In =anuar y 322 > the I00 0 formed a new T)n to deve lop an amendment to the 123.n standard. The raw data throughput over the !$% was defined to reach appro'imately ;22 :"ps using a radio "andwidth of >2:$*. It was also pro@ected that 123.n should of fe r a "e tt er oper ati ng di st ance tha n e'istin g networs. There was a lengthy phase in which two system proposals "loced each other. Aeside some different ideas #c odi ng+ higher order mod ulat ions+ spa ce-time-c odi ng& the re has "e en an over whel mi ng agreement tha t the inte nded high thro ughp ut can onl y "e achie ve d "y using :I:O techni(ues+ i.e. multiple antennas at the transmitter as well as at the receiver. The new standard "uilds upon the previous 123.a standard "y adding :I:O and an e'tension of the radio "andwidth to >2:$*. :I:O uses mul tipl e tra nsmi tter and rec eiv er antennas to allo w for increa sed data throughput through spatial multiple 'ing and for increas ed range "y e'pl oiting the spatia l diver sity as well as through space-time coding schemes lie alamouti coding >/. In 322B the 0nha nce d 5ir ele ss Consor tium #05C& was formed to help accelerate the I000 123.n develo pmen t pr ocess and pr omote a te chnol og y spec ific ation for interopera "ility of ne't 564N produc ts 3/. The final standard is e'pected to "e completed in 322;. In this art icle + we disc us s compu tat ion of input A0R in :I:O channels with different modulation types on each spatial stream. II.:I:O-O,D: O, D: is a multi -car ri er tr ans mi ssion te chni(ue in employment to decrease the inter sym"ol interference #I9I& of wireless systems with lesser sym"ol periods. 4s a result+ the over al l ca pa ci ty in wi re less systems is upgr aded. 4nother promising transmission techni(ue is :I:O which ena"les the enhancement of "it capacity and performance wi th low A0R proport iona l to the num"er of antenna s. There fore high spec trally effici ent wir eless transmission s ca n "e pr oduced "y us ing multi ple tr ans mis si ons and mult ip le receiving ant enna s. ,ur th ermore+ the amalgamation of :I:O and O,D: systems significantly decreases the e(uali*ation comple'ity B/. The de fin ition of :I:O sy ste ms is that wi th a giv en ar"itrar y wir eless communica tion sy stem+ there is a lin wh er e the tra nsmitt ing end and the re ce iving end ar e e(u ipped wit h mul tiple ante nna ele ments. The sig nals produced "y "oth types of anten nas com"ine in such a way+ which result in a reduced A0R or increased data rate. 4 ma@or advantage of :I:O system is their a"ility to utili*e multi -pa th pr opa gatio n to inc re as e the tr ansmissi on efficiency and channel capacity "y the use of random fading and multipath delay spr ead. In this way+ many order s of ma gni tude enhance ment can "e ac hie ve d in wi re less communications without the use of e'tra spectrum ;/. The destructive addition of multipath in a propagation medium !erformance analysis of data throughput in I000 123.n :I:O O,D: system :. 4. Rahman+ :. A. I. Rea*+ $afi*ah $usain+ :ohd 4lauddin :ohd 4li+ :ohd. :arufu**aman+ Department of Electrical, Electronic and Systems Engineering, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
