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4G的速度很快,最高可达1Gbps。那为什么我们还需要更多。问题是 无法提供实时应用程序。5G是下一代移动数据连接的代名词。 它肯定会提供10Gbps到100Gbps之间的高速,而且它将有足够的容量。
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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/62556ed347503a0a93dc2fb2/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/62556ed347503a0a93dc2fb2/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">AN O<span class="_ _0"></span>VER<span class="_ _1"></span>VIEW OF MASSIVE MIMO SY<span class="_ _0"></span>STEM </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls0 ws1">IN 5G</div><div class="t m0 x1 h3 y3 ff2 fs1 fc0 sc0 ls0 ws1">Sk. Saddam Hussain</div><div class="t m0 x2 h4 y4 ff2 fs2 fc0 sc0 ls0 ws1">*</div><div class="t m0 x3 h3 y3 ff2 fs1 fc0 sc0 ls0 ws1">, Shaik Mohammed <span class="_ _1"></span>Y<span class="_ _2"></span>aseen</div><div class="t m0 x4 h4 y4 ff2 fs2 fc0 sc0 ls0 ws1">2</div><div class="t m0 x5 h3 y3 ff2 fs1 fc0 sc0 ls0 ws1"> and Koushik Barman</div><div class="t m0 x6 h4 y4 ff2 fs2 fc0 sc0 ls0 ws1">3</div><div class="t m0 x1 h5 y5 ff3 fs3 fc0 sc0 ls0 ws1">Abstract:<span class="ff4 ws2"> 4G is proving good speeds up to 1Gbps. Then why do we need anything more. <span class="_ _1"></span>The problem is that it is </span></div><div class="t m0 x1 h5 y6 ff4 fs3 fc0 sc0 ls0 ws3">not able to provide real time applications. 5G is the name given to the next generation of mobile data connectivity<span class="_ _0"></span>. </div><div class="t m0 x1 h6 y7 ff5 fs3 fc0 sc0 ls0 ws1">It will de&#59071;nitely provide great speeds between 10Gbps to 100Gbps and it will have enough capacity<span class="_ _0"></span>. But the thing </div><div class="t m0 x1 h6 y8 ff5 fs3 fc0 sc0 ls0 ws1">that separated 5G <span class="_ _3"></span>from 4G is <span class="_ _3"></span>latency; the latency <span class="_ _3"></span>provided by 4G <span class="_ _3"></span>is between 40ms <span class="_ _3"></span>to 60ms, whereas <span class="_ _3"></span>in 5G it <span class="_ _3"></span>will </div><div class="t m0 x1 h6 y9 ff5 fs3 fc0 sc0 ls0 ws1">provide ultra <span class="_ _3"></span>latency between <span class="_ _3"></span>1ms to <span class="_ _3"></span>10ms. The standards <span class="_ _3"></span>for 5G <span class="_ _3"></span>will be <span class="_ _3"></span>set <span class="_ _3"></span>till 2020 <span class="_ _3"></span>and it <span class="_ _3"></span>will be <span class="_ _3"></span>applicable by </div><div class="t m0 x1 h6 ya ff5 fs3 fc0 sc0 ls0 ws1">2022/23. <span class="_ _4"></span>In <span class="_ _4"></span>this <span class="_ _4"></span>paper <span class="_ _4"></span>we <span class="_ _4"></span>have <span class="_ _4"></span>discussed <span class="_ _4"></span>about <span class="_ _4"></span>5G <span class="_ _4"></span>and <span class="_ _4"></span>its <span class="_ _4"></span>advantages, <span class="_ _4"></span>a <span class="_ _4"></span>probable <span class="_ _4"></span>architecture <span class="_ _4"></span>for <span class="_ _4"></span>5G <span class="_ _4"></span>and <span class="_ _4"></span>some </div><div class="t m0 x1 h6 yb ff5 fs3 fc0 sc0 ls0 ws1">challenges in <span class="_ _3"></span>5G. The <span class="_ _3"></span>main <span class="_ _3"></span>technology that <span class="_ _3"></span>maybe <span class="_ _3"></span>used in <span class="_ _3"></span>5G <span class="_ _3"></span>are <span class="_ _3"></span>massive MIMO, <span class="_ _3"></span>millimetre <span class="_ _3"></span>wave communica<span class="ff4">-</span></div><div class="t m0 x1 h6 yc ff5 fs3 fc0 sc0 ls0 ws1">tion, <span class="_ _4"></span>device <span class="_ _4"></span>to <span class="_ _4"></span>device <span class="_ _4"></span>communication, <span class="_ _5"></span>beam <span class="_ _4"></span>division <span class="_ _4"></span>multiple <span class="_ _4"></span>access <span class="_ _4"></span>etc. <span class="_ _5"></span>In <span class="_ _4"></span>this <span class="_ _4"></span>paper <span class="_ _4"></span>we <span class="_ _4"></span>have <span class="_ _5"></span>discussed <span class="_ _4"></span>about </div><div class="t m0 x1 h6 yd ff5 fs3 fc0 sc0 ls0 ws1">massive MIMO, <span class="_ _3"></span>channel <span class="_ _3"></span>estimate in <span class="_ _3"></span>massive <span class="_ _3"></span>MIMO, beam <span class="_ _3"></span>division <span class="_ _3"></span>multiple access <span class="_ _3"></span>technique <span class="_ _3"></span>to be <span class="_ _3"></span>used <span class="_ _3"></span>in mas<span class="ff4">-</span></div><div class="t m0 x1 h6 ye ff5 fs3 fc0 sc0 ls0 ws1">sive MIMO, <span class="_ _3"></span>antenna selection in <span class="_ _3"></span>massive MIMO, <span class="_ _3"></span>capacity and <span class="_ _3"></span>energy ef&#59071;ciency in massive <span class="_ _3"></span>MIMO. In <span class="_ _3"></span>future 5G </div><div class="t m0 x1 h6 yf ff5 fs3 fc0 sc0 ls0 ws1">is going <span class="_ _3"></span>to be <span class="_ _3"></span>a technology <span class="_ _3"></span>which will <span class="_ _3"></span>be invisible, <span class="_ _3"></span>I will <span class="_ _3"></span>be just <span class="_ _3"></span>there everywhere <span class="_ _3"></span>just like <span class="_ _3"></span>electricity<span class="_ _0"></span>. <span class="_ _3"></span>It is <span class="_ _3"></span>a very </div><div class="t m0 x1 h6 y10 ff5 fs3 fc0 sc0 ls0 ws1">good area for research as standards and frequency band for 5G are yet to be standardised.</div><div class="t m0 x1 h6 y11 ff3 fs3 fc0 sc0 ls0 ws1">Keywords:<span class="ff5"> <span class="_ _3"></span> <span class="_ _4"></span>Massive <span class="_ _3"></span>MIMO, <span class="_ _4"></span>Beam <span class="_ _3"></span>Division <span class="_ _4"></span>Multiple Access <span class="_ _3"></span>(BDMA), <span class="_ _3"></span>channel <span class="_ _4"></span>estimate, <span class="_ _3"></span>energy <span class="_ _3"></span>ef&#59071;ciency<span class="_ _1"></span>, <span class="_ _3"></span> <span class="_ _3"></span>an<span class="ff4">-</span></span></div><div class="t m0 x1 h5 y12 ff4 fs3 fc0 sc0 ls0 ws1">tenna selection.</div><div class="t m0 x7 h3 y13 ff2 fs1 fc0 sc0 ls0 ws4">1. INTRODUCTION</div><div class="t m0 x7 h7 y14 ff5 fs1 fc0 sc0 ls0 ws1">Mobile networking is a wireless technology than <span class="_ _1"></span>can provide voice and/or data networking, through a ra<span class="ff4">-</span></div><div class="t m0 x7 h7 y15 ff5 fs1 fc0 sc0 ls0 ws1">dio transmission. Mobile phone is one of the most famous applications <span class="_ _1"></span>of mobile networking. In past cir<span class="_ _1"></span><span class="ff4">-</span></div><div class="t m0 x7 h7 y16 ff5 fs1 fc0 sc0 ls0 ws1">cuit switching <span class="_ _1"></span>was used <span class="_ _1"></span>to <span class="_ _1"></span>transmit voice <span class="_ _1"></span>over a <span class="_ _1"></span>network, then <span class="_ _1"></span>we moved <span class="_ _1"></span>on <span class="_ _1"></span>to use <span class="_ _1"></span>both circuit-switching </div><div class="t m0 x7 h7 y17 ff5 fs1 fc0 sc0 ls0 ws1">and <span class="_ _4"></span>packet-switching <span class="_ _4"></span>for <span class="_ _4"></span>voice <span class="_ _4"></span>and <span class="_ _4"></span>data, <span class="_ _4"></span>now <span class="_ _4"></span>presently <span class="_ _4"></span>we <span class="_ _4"></span>are <span class="_ _4"></span>using <span class="_ _4"></span>packet <span class="_ _4"></span>switching <span class="_ _4"></span>only<span class="_ _0"></span>, <span class="_ _4"></span>this <span class="_ _4"></span>is <span class="_ _4"></span>how </div><div class="t m0 x7 h7 y18 ff5 fs1 fc0 sc0 ls0 ws1">spectrum <span class="_ _3"></span>has <span class="_ _4"></span>expanded <span class="_ _4"></span>from <span class="_ _3"></span>1G <span class="_ _4"></span>to <span class="_ _4"></span>4G <span class="_ _3"></span>[1]. <span class="_ _3"></span>T<span class="_ _0"></span>oday <span class="_ _4"></span>and <span class="_ _4"></span>in <span class="_ _3"></span>upcoming <span class="_ _4"></span>future <span class="_ _4"></span>wireless <span class="_ _3"></span>networks <span class="_ _4"></span>need <span class="_ _4"></span>to <span class="_ _3"></span>be </div><div class="t m0 x7 h7 y19 ff5 fs1 fc0 sc0 ls0 ws1">improved <span class="_ _4"></span>for <span class="_ _4"></span>meeting <span class="_ _4"></span>the <span class="_ _4"></span>demand <span class="_ _4"></span>for <span class="_ _4"></span>increased <span class="_ _4"></span>data <span class="_ _4"></span>rate, <span class="_ _4"></span>improved <span class="_ _4"></span>capacity<span class="_ _0"></span>, <span class="_ _4"></span>reduced <span class="_ _4"></span>latency <span class="_ _4"></span>and <span class="_ _4"></span>good </div><div class="t m0 x7 h7 y1a ff5 fs1 fc0 sc0 ls0 ws1">quality <span class="_ _4"></span>of <span class="_ _4"></span>service. <span class="_ _3"></span>W<span class="_ _0"></span>e <span class="_ _4"></span>are <span class="_ _4"></span>in <span class="_ _4"></span>the <span class="_ _5"></span>4</div><div class="t m0 x8 h8 y1b ff4 fs2 fc0 sc0 ls0 ws1">th</div><div class="t m0 x9 h7 y1a ff5 fs1 fc0 sc0 ls0 ws1"> <span class="_ _4"></span>generation <span class="_ _4"></span>of <span class="_ _4"></span>wireless <span class="_ _4"></span>communication, <span class="_ _4"></span>so <span class="_ _5"></span>now <span class="_ _4"></span>research <span class="_ _4"></span>is <span class="_ _4"></span>going <span class="_ _4"></span>on </div><div class="t m0 x7 h7 y1c ff5 fs1 fc0 sc0 ls0 ws1">for <span class="_ _6"></span>developing <span class="_ _6"></span>new <span class="_ _6"></span>standards <span class="_ _6"></span>for <span class="_ _6"></span>the <span class="_ _6"></span>next <span class="_ _6"></span>generation <span class="_ _6"></span>beyond <span class="_ _6"></span>4G <span class="_ _6"></span>i.e. <span class="_ _6"></span>5G. <span class="_ _5"></span>W<span class="_ _1"></span>ith <span class="_ _6"></span>increasing <span class="_ _6"></span>demands <span class="_ _6"></span>of </div><div class="t m0 x7 h7 y1d ff5 fs1 fc0 sc0 ls0 ws1">subscribers <span class="_ _3"></span>de&#59071;nitely <span class="_ _3"></span>4G <span class="_ _3"></span>will <span class="_ _3"></span>be <span class="_ _3"></span>replaced <span class="_ _3"></span>by <span class="_ _3"></span>5G <span class="_ _3"></span>with <span class="_ _3"></span>the <span class="_ _3"></span>help <span class="_ _4"></span>of <span class="_ _3"></span>some <span class="_ _3"></span>advanced <span class="_ _3"></span>technologies <span class="_ _3"></span>like <span class="_ _3"></span>mas<span class="ff4">-</span></div><div class="t m0 x7 h7 y1e ff5 fs1 fc0 sc0 ls0 ws1">sive <span class="_ _3"></span>MIMO, <span class="_ _3"></span>device-to-device <span class="_ _3"></span>communication, <span class="_ _3"></span>millimetre <span class="_ _4"></span>wave <span class="_ _3"></span>communication, <span class="_ _3"></span>Beam <span class="_ _3"></span>division <span class="_ _4"></span>multiple </div><div class="t m0 x7 h7 y1f ff5 fs1 fc0 sc0 ls0 ws1">access <span class="_ _4"></span>in <span class="_ _4"></span>massive <span class="_ _4"></span>MIMO <span class="_ _4"></span>etc. <span class="_ _3"></span>The <span class="_ _4"></span>technologies <span class="_ _4"></span>used <span class="_ _4"></span>in <span class="_ _4"></span>4G <span class="_ _4"></span>like <span class="_ _4"></span>High-Speed <span class="_ _3"></span>Packet Access <span class="_ _4"></span>(HSP<span class="_ _0"></span>A) <span class="_ _3"></span>and </div><div class="t m0 x7 h7 y20 ff5 fs1 fc0 sc0 ls0 ws1">Long T<span class="_ _0"></span>erm Evolution <span class="_ _3"></span>(L<span class="_ _0"></span>TE) will <span class="_ _3"></span>be used <span class="_ _3"></span>as <span class="_ _3"></span>a part <span class="_ _3"></span>of <span class="_ _3"></span>future advancement. <span class="_ _3"></span>For <span class="_ _3"></span>this advancement <span class="_ _3"></span>we <span class="_ _3"></span>may </div><div class="t m0 x7 h7 y21 ff5 fs1 fc0 sc0 ls0 ws1">use dif<span class="_ _1"></span>ferent methods, It may happen <span class="_ _1"></span>that we may use dif<span class="_ _1"></span>ferent spectrum <span class="_ _1"></span>access technique, increased fre<span class="ff4">-</span></div><div class="t m0 x7 h7 y22 ff5 fs1 fc0 sc0 ls0 ws1">quency range, deploying large number of antennas etc. [1] </div><div class="t m0 xa h7 y23 ff5 fs1 fc0 sc0 ls0 ws1">This <span class="_ _3"></span>whole <span class="_ _3"></span>thing <span class="_ _3"></span>started <span class="_ _3"></span>in <span class="_ _3"></span>1970s, <span class="_ _3"></span>till <span class="_ _3"></span>now <span class="_ _3"></span>the <span class="_ _3"></span>mobile <span class="_ _3"></span>wireless <span class="_ _3"></span>communication <span class="_ _3"></span>has <span class="_ _3"></span>come <span class="_ _3"></span>a <span class="_ _3"></span>long <span class="_ _3"></span>way </div><div class="t m0 x7 h9 y24 ff4 fs1 fc0 sc0 ls0 ws5">from analog communication to today&#8217;<span class="_ _0"></span>s modern digital mobile communication providing the subscribers </div><div class="t m0 x7 h9 y25 ff4 fs1 fc0 sc0 ls0 ws6">with improved data rate of megabits per second over wide area and few hundreds of megabits per second </div><div class="t m0 x7 h7 y26 ff5 fs1 fc0 sc0 ls0 ws1">in <span class="_ _1"></span>a <span class="_ _0"></span>local <span class="_ _1"></span>area. <span class="_ _0"></span>W<span class="_ _0"></span>e <span class="_ _0"></span>are <span class="_ _1"></span>going <span class="_ _0"></span>on <span class="_ _1"></span>well <span class="_ _1"></span>toward <span class="_ _0"></span>next <span class="_ _1"></span>stepping <span class="_ _0"></span>stone <span class="_ _1"></span>in <span class="_ _1"></span>future <span class="_ _0"></span>i.e. <span class="_ _1"></span>5G.It <span class="_ _0"></span>is <span class="_ _1"></span>predicted <span class="_ _0"></span>that <span class="_ _1"></span>5G <span class="_ _1"></span>will </div><div class="t m0 x7 h7 y27 ff5 fs1 fc0 sc0 ls0 ws1">be <span class="_ _1"></span>in <span class="_ _1"></span>operation <span class="_ _1"></span>by 2020, <span class="_ _1"></span>hence <span class="_ _1"></span>immense <span class="_ _1"></span>research <span class="_ _1"></span>in <span class="_ _1"></span>going <span class="_ _1"></span>on <span class="_ _1"></span>in <span class="_ _1"></span>this <span class="_ _1"></span>&#59071;eld. <span class="_ _1"></span>The <span class="_ _1"></span>world <span class="_ _1"></span>is <span class="_ _1"></span>imagining <span class="_ _1"></span>a <span class="_ _1"></span>future </div><div class="t m0 x7 h9 y28 ff4 fs1 fc0 sc0 ls0 ws1">where there is no restriction to the access and sharing of information from anywhere by anyone.</div><div class="t m0 x7 ha y29 ff5 fs4 fc0 sc0 ls0 ws1">* <span class="_ _7"> </span>Department of Electronics and Communications Lovely Professional University<span class="_ _0"></span>, Punjab, India</div><div class="t m0 x7 ha y2a ff5 fs4 fc0 sc0 ls0 ws1"> <span class="_ _8"> </span>Email: shaik.hussain.saddam@gmail.com, smdyaseen.619@gmail.com</div><div class="t m0 x5 hb y2b ff5 fs5 fc0 sc0 ls0 ws1">2</div><div class="t m0 xb ha y2a ff5 fs4 fc0 sc0 ls0 ws1">, koushik.15737@lpu.co.in</div><div class="t m0 xc hb y2b ff5 fs5 fc0 sc0 ls0 ws1">3</div><div class="t m0 x7 hc y2c ff6 fs3 fc0 sc0 ls0 ws1">I J C T A<span class="ff5">, 9(1<span class="_ _1"></span>1) 2016, pp. 4957-4968</span></div><div class="t m0 x7 h6 y2d ff5 fs3 fc0 sc0 ls0 ws1">&#169; International Science Press</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div> </body> </html>
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