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我发表的一篇关于RFID和无线局域网,篮牙干扰的EI文章
GahkdtToothBasketTooth.zip
  • syBitErrorRateAnalysisofWi-FiandBluetoothUndertheInterferenceof2.45GHzRFID.pdf
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<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/625d266792dc900e62728a16/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/625d266792dc900e62728a16/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x1 h3 y2 ff2 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h2 y3 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h2 y4 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h4 y5 ff3 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h5 y6 ff4 fs1 fc0 sc0 ls1 ws1">Wei Jiang, Yan Ma </div><div class="t m0 x2 h5 y7 ff4 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h6 y8 ff5 fs2 fc0 sc1 ls2 ws2">Bit Error Rate Analysis of <span class="ls3 ws3">Wi-Fi and Bluetooth under the </span></div><div class="t m0 x2 h6 y9 ff5 fs2 fc0 sc1 ls4 ws4">interference of 2.45 GHz RFID </div><div class="t m0 x2 h7 ya ff1 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h6 yb ff5 fs2 fc0 sc1 ls0 ws0"> </div><div class="t m0 x2 h8 yc ff6 fs4 fc0 sc0 ls5 ws0">Abstract <span class="_ _0"></span><span class="ff1 fs3 ls6 ws5">IEEE 802.11b WLAN (Wi-Fi) and IEEE <span class="ls7 ws0">802.15.1 </span></span></div><div class="t m0 x2 h7 yd ff1 fs3 fc0 sc0 ls8 ws6">WP<span class="_ _1"></span>AN (Bluetoot<span class="_ _2"></span>h) are preval<span class="_ _2"></span>ent nowada<span class="_ _2"></span>ys, and Radio </div><div class="t m0 x2 h7 ye ff1 fs3 fc0 sc0 ls9 ws7">Frequenc<span class="_ _3"></span>y Identific<span class="_ _3"></span>ation (RFID<span class="_ _3"></span>) is an em<span class="_ _3"></span>ergi<span class="_ _3"></span>ng technol<span class="_ _3"></span>ogy </div><div class="t m0 x2 h7 yf ff1 fs3 fc0 sc0 lsa ws8">which has wi<span class="_ _2"></span>der applicat<span class="_ _2"></span>ions. 802.<span class="_ _2"></span>1<span class="_ _3"></span>1b occupies unli<span class="_ _2"></span>censed </div><div class="t m0 x2 h7 y10 ff1 fs3 fc0 sc0 lsb ws9">Industrial, Scientific and Med<span class="_ _2"></span>i<span class="lsc wsa">cal (ISM) band (2.4-2.4835 GHz) </span></div><div class="t m0 x2 h7 y11 ff1 fs3 fc0 sc0 lsd wsb">and uses Dire<span class="_ _2"></span>ct Sequence <span class="_ _2"></span>Spread Spectru<span class="_ _2"></span>m (DSSS) to alle<span class="_ _2"></span>viate </div><div class="t m0 x2 h7 y12 ff1 fs3 fc0 sc0 ls7 wsc">the narrow band<span class="_ _2"></span> interference an<span class="_ _2"></span>d fading. Bluetooth i<span class="_ _2"></span>s also one<span class="_ _2"></span> </div><div class="t m0 x2 h7 y13 ff1 fs3 fc0 sc0 lsd wsd">user of ISM band an<span class="_ _2"></span>d adopts Freq<span class="_ _2"></span>uency Hopping Spr<span class="_ _2"></span>ead </div><div class="t m0 x2 h7 y14 ff1 fs3 fc0 sc0 lse wse">Spectrum (FHSS) to avoid the mutual int<span class="_ _2"></span>erference. RFID can </div><div class="t m0 x2 h7 y15 ff1 fs3 fc0 sc0 lsf wsf">operate on multipl<span class="_ _2"></span>e frequency band<span class="_ _2"></span>s, such as 135 KHz, 13.56<span class="_ _2"></span> </div><div class="t m0 x2 h7 y16 ff1 fs3 fc0 sc0 ls10 ws10">MHz and 2.45 <span class="_ _2"></span>GHz. When 2.45 G<span class="_ _2"></span>Hz RFID devic<span class="_ _2"></span>e, which use<span class="_ _2"></span>s </div><div class="t m0 x2 h7 y17 ff1 fs3 fc0 sc0 ls10 ws11">FHSS, collocat<span class="_ _2"></span>es with 802.11b or Bluetooth, the mutua<span class="_ _2"></span>l </div><div class="t m0 x2 h7 y18 ff1 fs3 fc0 sc0 ls10 ws12">interference is inev<span class="_ _2"></span>itable. Althoug<span class="_ _2"></span>h DSSS and FHSS are </div><div class="t m0 x2 h7 y19 ff1 fs3 fc0 sc0 ls11 ws13">applied to <span class="_ _2"></span>mitigate th<span class="_ _2"></span>e interferenc<span class="_ _2"></span>e, their perfor<span class="_ _2"></span>mance </div><div class="t m0 x2 h7 y1a ff1 fs3 fc0 sc0 ls10 ws14">degradation <span class="_ _2"></span>may be very si<span class="_ _2"></span>gnificant. Theref<span class="_ _2"></span>ore, in this art<span class="_ _2"></span>icle, </div><div class="t m0 x2 h7 y1b ff1 fs3 fc0 sc0 lsf ws15">the impact of 2<span class="_ _2"></span>.45 GHz RFI<span class="_ _2"></span>D on 802.11b and Bluetooth is<span class="_ _2"></span> </div><div class="t m0 x2 h7 y1c ff1 fs3 fc0 sc0 ls12 ws16">investigated<span class="_ _3"></span>. Bit Error Rate (BER) of 80<span class="_ _3"></span>2.1<span class="_ _3"></span>1b and<span class="_ _3"></span> Bluetooth </div><div class="t m0 x2 h7 y1d ff1 fs3 fc0 sc0 ls13 ws17">are analyz<span class="_ _2"></span>ed by establi<span class="_ _2"></span>shing a ma<span class="_ _2"></span>thematical<span class="_ _2"></span> model, and th<span class="_ _2"></span>e </div><div class="t m0 x2 h7 y1e ff1 fs3 fc0 sc0 ls13 ws18">simulat<span class="_ _2"></span>ion results <span class="_ _2"></span>are compar<span class="_ _2"></span>ed with the t<span class="_ _2"></span>heoretic<span class="_ _2"></span>al analysis <span class="_ _2"></span>to </div><div class="t m0 x2 h7 y1f ff1 fs3 fc0 sc0 ls14 ws19">justi<span class="_ _3"></span>fy this<span class="_ _3"></span> mathem<span class="_ _3"></span>atical m<span class="_ _3"></span>odel.<span class="ff7 ls0 ws0"> </span></div><div class="t m0 x2 h7 y20 ff1 fs3 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h9 y21 ff2 fs3 fc0 sc0 lsd ws0">Keywords<span class="ff1 ls15 ws1a"> 802.11b, 802.15.1, Blueto<span class="_ _2"></span>oth, Bit Error Rate (BE<span class="_ _2"></span>R), </span></div><div class="t m0 x2 h7 y22 ff1 fs3 fc0 sc0 ls16 ws1b">Interference<span class="_ _3"></span>, Radio Freque<span class="_ _3"></span>ncy Identi<span class="_ _3"></span>fication (RF<span class="_ _3"></span>ID) </div><div class="t m0 x2 ha y23 ff5 fs1 fc0 sc1 ls0 ws0"> </div><div class="t m0 x2 hb y24 ff8 fs1 fc0 sc1 ls17 ws0">1 Introduction</div><div class="t m0 x3 hc y25 ff9 fs5 fc0 sc1 ls0 ws0"> </div><div class="t m0 x2 hb y26 ff8 fs1 fc0 sc1 ls0 ws0"> </div><div class="t m0 x2 h7 y27 ff1 fs3 fc0 sc0 ls18 ws1c">IEEE 802.1<span class="_ _3"></span>1b PHY<span class="_ _1"></span> oper<span class="_ _2"></span>ates in th<span class="ls19 ws1d">e frequency band from 2.4 to </span></div><div class="t m0 x2 h7 y28 ff1 fs3 fc0 sc0 ls10 ws1e">2.4835 GHz as allo<span class="_ _2"></span>cated by regulat<span class="_ _2"></span>ory bodies in Europe <span class="_ _2"></span>and </div><div class="t m0 x2 h7 y29 ff1 fs3 fc0 sc0 ls8 ws1f">USA, or 2.471-<span class="_ _2"></span>2.497 GHz freq<span class="_ _2"></span>uency band i<span class="_ _2"></span>n Japan (see [<span class="_ _2"></span>2] </div><div class="t m0 x2 h7 y2a ff1 fs3 fc0 sc0 ls10 ws20">[3]). But in later, 2.4-2.4835 GHz band is allo<span class="_ _2"></span>cated to 802.11b </div><div class="t m0 x2 h7 y2b ff1 fs3 fc0 sc0 ls8 ws21">by MPHPT of Japan. Hence, 80<span class="_ _2"></span>2.1<span class="_ _3"></span>1b occupies 2.4-2.<span class="_ _2"></span>4835 GHz </div><div class="t m0 x2 h7 y2c ff1 fs3 fc0 sc0 ls1a ws22">ISM band<span class="_ _3"></span> almost wo<span class="_ _3"></span>rldwide<span class="_ _3"></span>. T<span class="_ _1"></span>o combat<span class="_ _3"></span> the na<span class="_ _3"></span>rrow band<span class="_ _3"></span> </div><div class="t m0 x2 h7 y2d ff1 fs3 fc0 sc0 ls10 ws23">interference an<span class="_ _2"></span>d the multipath fadin<span class="_ _2"></span>g, 802.1<span class="_ _3"></span>1b adopts DSS<span class="_ _2"></span>S. </div><div class="t m0 x2 h7 y2e ff1 fs3 fc0 sc0 ls8 ws24">The baseband sign<span class="_ _2"></span>al is spread by 11-chip Barker code and </div><div class="t m0 x2 h7 y2f ff1 fs3 fc0 sc0 ls1b ws25">occupies 22 MHz band<span class="_ _2"></span>width. The whole 83.5 MHz frequ<span class="_ _2"></span>ency </div><div class="t m0 x2 h7 y30 ff1 fs3 fc0 sc0 lsd ws26">band is divid<span class="_ _2"></span>ed into many ove<span class="_ _2"></span>rlapping or n<span class="_ _2"></span>on-overlappin<span class="_ _2"></span>g 22 </div><div class="t m0 x2 h7 y31 ff1 fs3 fc0 sc0 ls15 ws27">MHz channels. Hence, in a multiple cell n<span class="_ _2"></span>etwork topology<span class="_ _3"></span>, </div><div class="t m0 x2 hd y32 ff1 fs6 fc0 sc0 ls0 ws0"> <span class="_ _4"></span> <span class="_ _1"></span> </div><div class="t m0 x2 he y33 ff1 fs7 fc0 sc0 ls1c ws28">Received <span class="_ _5"></span>date: 2007-07-0<span class="_ _3"></span>1 </div><div class="t m0 x2 he y34 ff1 fs7 fc0 sc0 ls1d ws29">XX Xx<span class="ffa ls0 ws0">&#65288;</span></div><div class="t m0 x4 he y35 ffa fs7 fc0 sc0 ls0 ws0">&#65289;<span class="ff1 ls1d ws29">, XX x, XX x </span></div><div class="t m0 x2 he y36 ff1 fs7 fc0 sc0 ls1e ws2a">Schools, </div><div class="t m0 x2 he y37 ff1 fs7 fc0 sc0 ls1f ws2b">Univ<span class="_ _3"></span>, Be<span class="_ _3"></span>ijing 100xxx, China </div><div class="t m0 x2 he y38 ff1 fs7 fc0 sc0 ls1e ws2c">Email: xxx@xxx.<span class="_ _3"></span>xxx </div><div class="t m0 x2 h2 y39 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x5 h7 yc ff1 fs3 fc0 sc0 ls20 ws2d">overlapping<span class="_ _3"></span> or adjacent ce<span class="_ _3"></span>lls using dif<span class="_ _3"></span>fe<span class="_ _3"></span>rent channels can </div><div class="t m0 x5 h7 yd ff1 fs3 fc0 sc0 ls21 ws2e">operate simult<span class="_ _2"></span>aneously without int<span class="_ _2"></span>erference if the separati<span class="_ _2"></span>on </div><div class="t m0 x5 h7 ye ff1 fs3 fc0 sc0 lsa ws2f">between the <span class="_ _2"></span>center freq<span class="_ _2"></span>uencies i<span class="_ _2"></span>s at least 30 <span class="_ _2"></span>MHz. Di<span class="_ _2"></span>fferential </div><div class="t m0 x5 h7 yf ff1 fs3 fc0 sc0 ls22 ws30">binary ph<span class="_ _3"></span>ase shift ke<span class="_ _3"></span>ying (DB<span class="_ _3"></span>PSK) and d<span class="_ _3"></span>if<span class="_ _3"></span>ferential qua<span class="_ _3"></span>drature </div><div class="t m0 x5 h7 y10 ff1 fs3 fc0 sc0 lsd ws31">phase shift key<span class="_ _2"></span>ing (DQPSK) are ap<span class="_ _2"></span>plied to provide 1 Mbp<span class="_ _2"></span>s and </div><div class="t m0 x5 h7 y11 ff1 fs3 fc0 sc0 ls21 ws32">2 Mbps data rates, respe<span class="_ _2"></span>ctively<span class="_ _3"></span>. For the higher data rate, 5.5 </div><div class="t m0 x5 h7 y12 ff1 fs3 fc0 sc0 ls22 ws33">Mbps and <span class="_ _3"></span>1<span class="_ _3"></span>1 Mbps<span class="_ _3"></span>, Complem<span class="_ _3"></span>entary Co<span class="_ _3"></span>de Keying<span class="_ _3"></span> (CCK) </div><div class="t m0 x5 h7 y13 ff1 fs3 fc0 sc0 ls23 ws34">modulati<span class="_ _3"></span>on is use<span class="_ _3"></span>d. Accord<span class="_ _3"></span>ing to [2<span class="_ _3"></span>], the min<span class="_ _3"></span>imum t<span class="_ _3"></span>ransmitt<span class="_ _3"></span>ed </div><div class="t m0 x5 h7 y14 ff1 fs3 fc0 sc0 ls1b ws35">power shall<span class="_ _2"></span> be no less than 1 mW<span class="_ _1"></span>, and the maxi<span class="_ _2"></span>mum power is </div><div class="t m0 x5 h7 y15 ff1 fs3 fc0 sc0 ls7 ws36">1000 mW in USA, 100 mW <span class="_ _3"></span>(EIRP) in Europe an<span class="_ _2"></span>d 10 mW per </div><div class="t m0 x5 h7 y16 ff1 fs3 fc0 sc0 ls24 ws37">MHz in Japan. </div><div class="t m0 x6 h7 y17 ff1 fs3 fc0 sc0 ls7 ws38">According t<span class="_ _2"></span>o IEEE 802.15.1-2<span class="_ _2"></span>005 in [4], Bluet<span class="_ _2"></span>ooth operate<span class="_ _2"></span>s </div><div class="t m0 x5 h7 y18 ff1 fs3 fc0 sc0 ls24 ws39">in the ISM ban<span class="_ _2"></span>d from 2.4 to 2.<span class="_ _2"></span>4835 GHz. FH<span class="_ _2"></span>SS is applied <span class="_ _2"></span>to </div><div class="t m0 x5 h7 y19 ff1 fs3 fc0 sc0 ls1a ws3a">alleviat<span class="_ _3"></span>e the in<span class="_ _3"></span>terference<span class="_ _3"></span>, and th<span class="_ _3"></span>e maximum<span class="_ _3"></span> hop rate<span class="_ _3"></span> is up to </div><div class="t m0 x5 h7 y1a ff1 fs3 fc0 sc0 ls7 ws3b">1600hops/s. The dat<span class="_ _2"></span>a rate of Bluetooth is 1 Mbps and the<span class="_ _2"></span>refore </div><div class="t m0 x5 h7 y1b ff1 fs3 fc0 sc0 ls1b ws3c">1 MHz bandwidth i<span class="_ _2"></span>s required per channe<span class="_ _2"></span>l. T<span class="_ _1"></span>otal 79 channe<span class="_ _2"></span>ls </div><div class="t m0 x5 h7 y1c ff1 fs3 fc0 sc0 ls8 ws3d">are available f<span class="_ _2"></span>or hopping, and<span class="_ _2"></span> the center frequen<span class="_ _2"></span>cy of each </div><div class="t m0 x5 h7 y1d ff1 fs3 fc0 sc0 ls11 ws3e">channel is <span class="ff7 ls25 ws0">f <span class="_ _2"></span><span class="ff1 ls26">=2402+</span><span class="ls0">k<span class="_ _3"></span><span class="ff1 ls27 ws3f"> MHz (<span class="ff7 ls28 ws0">k </span><span class="ls29 ws40">=0,&#8230;,78). The tr<span class="ls25 ws41">an<span class="_ _2"></span>smitted power </span></span></span></span></span></div><div class="t m0 x5 h7 y1e ff1 fs3 fc0 sc0 ls1b ws42">is categoriz<span class="_ _2"></span>ed into three l<span class="_ _2"></span>evels: 100 <span class="_ _2"></span>mW<span class="_ _1"></span>, 2.5 mW and 1 mW<span class="_ _1"></span>. </div><div class="t m0 x5 h7 y1f ff1 fs3 fc0 sc0 ls22 ws43">The modul<span class="_ _3"></span>ation of Blu<span class="_ _3"></span>etooth is<span class="_ _3"></span> Gaussian<span class="_ _3"></span> frequency sh<span class="_ _3"></span>ift </div><div class="t m0 x5 h7 y20 ff1 fs3 fc0 sc0 lsd ws44">keying (GFSK)<span class="_ _2"></span> with a bandwidt<span class="_ _2"></span>h-bit period produ<span class="_ _2"></span>ct, known as </div><div class="t m0 x5 h7 y21 ff1 fs3 fc0 sc0 ls2a ws45">bandwidth time (BT), of 0.5. </div><div class="t m0 x6 h7 y22 ff1 fs3 fc0 sc0 ls2b ws46">RFID that op<span class="_ _3"></span>erates on<span class="_ _3"></span> 2.45 GHz ISM band is<span class="_ _3"></span> specified in </div><div class="t m0 x5 h7 y3a ff1 fs3 fc0 sc0 ls2c ws47">ISO/IEC 1800<span class="_ _3"></span>0-4 standa<span class="_ _3"></span>rd [6]. 2.45<span class="_ _3"></span> GHz RFID PHY<span class="_ _1"></span> <span class="_ _2"></span>has two </div><div class="t m0 x5 h7 y3b ff1 fs3 fc0 sc0 ls11 ws48">modes: Mo<span class="_ _2"></span>de 1 and 2. Both mod<span class="_ _2"></span>es occupy 2.4-2.<span class="_ _2"></span>4835 GHz </div><div class="t m0 x5 h7 y3c ff1 fs3 fc0 sc0 lsf ws49">band and us<span class="_ _2"></span>e FHSS to mi<span class="_ _2"></span>tigate the in<span class="_ _2"></span>terference. Mod<span class="_ _2"></span>e 1 RFID, </div><div class="t m0 x5 h7 y3d ff1 fs3 fc0 sc0 ls2b ws4a">with a da<span class="_ _3"></span>ta rate o<span class="_ _3"></span>f 30-40<span class="_ _3"></span> Kbps, adop<span class="_ _3"></span>ts Amplitud<span class="_ _3"></span>e Shift<span class="_ _3"></span> Keying </div><div class="t m0 x5 h7 y3e ff1 fs3 fc0 sc0 lse ws4b">(ASK) in the f<span class="_ _2"></span>orward link and Backscatter<span class="_ _2"></span> modulation in<span class="_ _2"></span> the </div><div class="t m0 x5 h7 y3f ff1 fs3 fc0 sc0 ls10 ws4c">reverse link. Th<span class="_ _2"></span>e channels, the hop<span class="_ _2"></span>ping rate an<span class="_ _2"></span>d the transmitte<span class="_ _2"></span>d </div><div class="t m0 x5 h7 y40 ff1 fs3 fc0 sc0 lsd ws4d">power of Mode 1 are no<span class="_ _2"></span>t defined in the st<span class="_ _2"></span>andard, instea<span class="_ _2"></span>d, will </div><div class="t m0 x5 h7 y41 ff1 fs3 fc0 sc0 lsd ws4e">be deter<span class="_ _2"></span>mined by each cou<span class="_ _2"></span>ntry's regul<span class="_ _2"></span>atory bodie<span class="_ _2"></span>s. For </div><div class="t m0 x5 h7 y42 ff1 fs3 fc0 sc0 lsd ws49">example, the <span class="_ _2"></span>maximu<span class="_ _2"></span>m transmitted po<span class="_ _2"></span>wer in Japa<span class="_ _2"></span>n is 300 <span class="_ _2"></span>mW<span class="_ _1"></span>, </div><div class="t m0 x5 h7 y43 ff1 fs3 fc0 sc0 lsd ws4f">while this power is 1 W in USA. Mode 2 RFID, with a 384 </div><div class="t m0 x5 h7 y44 ff1 fs3 fc0 sc0 ls24 ws50">Kbps data rate, use<span class="_ _2"></span>s Gaussian Minimu<span class="_ _2"></span>m Shift Keying (GMSK<span class="_ _2"></span>) </div><div class="t m0 x5 h7 y45 ff1 fs3 fc0 sc0 ls24 ws51">with BT=0.5 in <span class="_ _2"></span>the forward link and Back<span class="_ _2"></span>scatter modulation in </div><div class="t m0 x5 h7 y46 ff1 fs3 fc0 sc0 ls1b ws52">the revers<span class="_ _2"></span>e link. Mode 2 RFI<span class="_ _2"></span>D has 100 ho<span class="_ _2"></span>pping chann<span class="_ _2"></span>els, and </div><div class="t m0 x5 h7 y47 ff1 fs3 fc0 sc0 ls2d ws53">the center fre<span class="_ _3"></span>quency is<span class="_ _3"></span> (2931+<span class="ff7 ls0 ws0">m<span class="ff1 ls19">)&#215;</span>f</span></div><div class="t m0 x7 hf y48 ff7 fs8 fc0 sc0 ls2e ws0">CH</div><div class="t m0 x8 h7 y49 ff1 fs3 fc0 sc0 ls10 ws54">, where <span class="ff7 ls0 ws0">f</span></div><div class="t m0 x9 hf y48 ff7 fs8 fc0 sc0 ls2e ws0">CH </div><div class="t m0 xa h7 y49 ff1 fs3 fc0 sc0 ls2f ws55">=819.2 KHz </div><div class="t m0 x5 h7 y4a ff1 fs3 fc0 sc0 ls30 ws0">and <span class="_ _6"></span><span class="ff7 ls0">m</span><span class="ls31 ws56"> is the<span class="_ _3"></span> channel numbe<span class="_ _3"></span>r from 0 to 99<span class="_ _3"></span>. The bandwi<span class="_ _3"></span>dth of </span></div><div class="t m0 x5 h7 y4b ff1 fs3 fc0 sc0 ls8 ws57">each chann<span class="_ _2"></span>el is 1 MHz, but the <span class="_ _2"></span>separation of o<span class="_ _2"></span>perating </div><div class="t m0 x5 h7 y4c ff1 fs3 fc0 sc0 ls7 ws58">frequencies is 0.<span class="_ _2"></span>8192 MHz. </div><div class="t m0 x6 h7 y4d ff1 fs3 fc0 sc0 ls13 ws59">There are so<span class="_ _2"></span>me related studi<span class="_ _2"></span>es about the c<span class="_ _2"></span>oexistenc<span class="_ _2"></span>e in 2.4 </div><div class="t m0 x5 h7 y4e ff1 fs3 fc0 sc0 ls10 ws5a">GHz ISM <span class="_ _2"></span>band. In [7] [8], t<span class="_ _2"></span>he interference <span class="_ _2"></span>between <span class="_ _2"></span>802.1<span class="_ _3"></span>1b </div><div class="t m0 x5 h7 y4f ff1 fs3 fc0 sc0 ls32 ws5b">and Blueto<span class="_ _2"></span>oth is analyzed an<span class="_ _2"></span>d several coexiste<span class="_ _2"></span>nce method<span class="_ _2"></span>s are </div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>
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