复现mimo.zip

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具体内容是控制激活天线的数量来完成massive mimo的波束赋形.复现的文献在里面IEEEAccess2018-Oct-TsU(1)
复现mimo.zip
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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/625d0bf292dc900e626d7ce3/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/625d0bf292dc900e626d7ce3/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">Received<span class="_ _0"> </span>August<span class="_ _0"> </span>16,<span class="_ _0"> </span>2018,<span class="_ _0"> </span>accepted<span class="_ _0"> </span>September<span class="_ _0"> </span>27,<span class="_ _0"> </span>2018,<span class="_ _0"> </span>date<span class="_ _0"> </span>of<span class="_ _0"> </span>publication<span class="_ _0"> </span>October<span class="_ _0"> </span>1,<span class="_ _0"> </span>2018,<span class="_ _0"> </span>date<span class="_ _0"> </span>of<span class="_ _0"> </span>current<span class="_ _0"> </span>version<span class="_ _0"> </span>October<span class="_ _0"> </span>25,<span class="_ _0"> </span>2018.</div><div class="t m0 x1 h3 y2 ff2 fs1 fc0 sc0 ls0 ws0">Digital<span class="_ _1"> </span>Object<span class="_ _1"> </span>Identifier<span class="_ _1"> </span>1<span class="_ _2"></span>0.1<span class="_ _3"></span>1<span class="_ _2"></span>09/ACCESS.20<span class="_ _2"></span>18.2872953</div><div class="t m0 x1 h4 y3 ff3 fs2 fc1 sc0 ls0 ws0">Partially-Activated<span class="_ _4"> </span>Conjugate<span class="_ _4"> </span>Beamforming<span class="_ _4"> </span>for</div><div class="t m0 x1 h4 y4 ff3 fs2 fc1 sc0 ls0 ws0">LoS<span class="_ _4"> </span>Massive<span class="_ _4"> </span>MIMO<span class="_ _4"> </span>Communications</div><div class="t m0 x1 h5 y5 ff4 fs3 fc0 sc0 ls0 ws0">WENDONG<span class="_ _5"> </span>LIU</div><div class="t m0 x2 h6 y6 ff4 fs4 fc0 sc0 ls0 ws0">1</div><div class="t m0 x3 h5 y5 ff4 fs3 fc0 sc0 ls0 ws0">,<span class="_ _5"> </span>(Student<span class="_ _6"> </span>Member<span class="_ _2"></span>,<span class="_ _6"> </span>I<span class="_ _7"></span>EEE),<span class="_ _6"> </span>ZHAOCHENG<span class="_ _5"> </span>W<span class="_ _2"></span>ANG</div><div class="t m0 x4 h6 y6 ff4 fs4 fc0 sc0 ls0 ws0">1</div><div class="t m0 x5 h5 y5 ff4 fs3 fc0 sc0 ls0 ws0">,<span class="_ _6"> </span>(Senior<span class="_ _5"> </span>Member<span class="_ _2"></span>,<span class="_ _6"> </span>I<span class="_ _7"></span>EEE),</div><div class="t m0 x1 h5 y7 ff4 fs3 fc0 sc0 ls0 ws0">JIAN<span class="_ _7"></span>F<span class="_ _7"></span>EI<span class="_ _6"> </span>CAO</div><div class="t m0 x6 h6 y8 ff4 fs4 fc0 sc0 ls0 ws0">2</div><div class="t m0 x7 h5 y7 ff4 fs3 fc0 sc0 ls0 ws0">,<span class="_ _6"> </span>SH<span class="_ _7"></span>ENG<span class="_ _5"> </span>CHEN</div><div class="t m0 x8 h6 y8 ff4 fs4 fc0 sc0 ls0 ws0">3,4</div><div class="t m0 x9 h5 y7 ff4 fs3 fc0 sc0 ls0 ws0">,<span class="_ _6"> </span>(Fellow<span class="_ _2"></span>,<span class="_ _6"> </span>I<span class="_ _7"></span>EEE),<span class="_ _6"> </span>AN<span class="_ _7"></span>D<span class="_ _5"> </span>LA<span class="_ _7"></span>JOS<span class="_ _6"> </span>HANZO</div><div class="t m0 xa h6 y8 ff4 fs4 fc0 sc0 ls0 ws0">3</div><div class="t m0 xb h5 y7 ff4 fs3 fc0 sc0 ls0 ws0">,<span class="_ _6"> </span>(Fellow<span class="_ _2"></span>,<span class="_ _6"> </span>I<span class="_ _7"></span>EEE)</div><div class="t m0 x1 h7 y9 ff5 fs5 fc0 sc0 ls0 ws0">1</div><div class="t m0 xc h8 ya ff5 fs6 fc0 sc0 ls0 ws0">Tsinghua<span class="_ _1"> </span>National<span class="_ _1"> </span>Laboratory<span class="_ _1"> </span>for<span class="_ _1"> </span>Information<span class="_ _1"> </span>Science<span class="_ _1"> </span>and<span class="_ _1"> </span>T<span class="_ _2"></span>echnology<span class="_ _2"></span>,<span class="_ _1"> </span>Department<span class="_ _1"> </span>of<span class="_ _1"> </span>Electronic<span class="_ _1"> </span>Engineering,<span class="_ _1"> </span>Tsinghua<span class="_ _1"> </span>Univ<span class="_ _8"></span>ersity<span class="_ _2"></span>,<span class="_ _1"> </span>Beijing<span class="_ _1"> </span>100084,<span class="_ _1"> </span>China</div><div class="t m0 x1 h7 yb ff5 fs5 fc0 sc0 ls0 ws0">2</div><div class="t m0 xc h8 yc ff5 fs6 fc0 sc0 ls0 ws0">SONY<span class="_ _1"> </span>China<span class="_ _1"> </span>Research<span class="_ _1"> </span>Laboratory<span class="_ _2"></span>,<span class="_ _1"> </span>Beijing<span class="_ _1"> </span>100190,<span class="_ _1"> </span>China</div><div class="t m0 x1 h7 yd ff5 fs5 fc0 sc0 ls0 ws0">3</div><div class="t m0 xc h8 ye ff5 fs6 fc0 sc0 ls0 ws0">School<span class="_ _1"> </span>of<span class="_ _1"> </span>Electronics<span class="_ _1"> </span>and<span class="_ _1"> </span>Computer<span class="_ _1"> </span>Science,<span class="_ _1"> </span>Uni<span class="_ _8"></span>versity<span class="_ _1"> </span>of<span class="_ _1"> </span>Southampton,<span class="_ _1"> </span>Southampton<span class="_ _1"> </span>SO17<span class="_ _1"> </span>1BJ,<span class="_ _1"> </span>U.K.</div><div class="t m0 x1 h7 yf ff5 fs5 fc0 sc0 ls0 ws0">4</div><div class="t m0 xc h8 y10 ff5 fs6 fc0 sc0 ls0 ws0">King<span class="_ _1"> </span>Abdulaziz<span class="_ _1"> </span>Univ<span class="_ _8"></span>ersity<span class="_ _2"></span>,<span class="_ _1"> </span>Jeddah<span class="_ _1"> </span>21589,<span class="_ _1"> </span>Saudi<span class="_ _1"> </span>Arabia</div><div class="t m0 x1 h9 y11 ff5 fs7 fc0 sc0 ls0 ws0">Corresponding<span class="_ _0"> </span>author:<span class="_ _1"> </span>Lajos<span class="_ _0"> </span>Hanzo<span class="_ _0"> </span>(lh@ecs.soton.ac.uk)</div><div class="t m0 x1 h9 y12 ff5 fs7 fc0 sc0 ls0 ws0">This<span class="_ _0"> </span>work<span class="_ _1"> </span>was<span class="_ _1"> </span>supported<span class="_ _0"> </span>in<span class="_ _0"> </span>part<span class="_ _0"> </span>by<span class="_ _1"> </span>the<span class="_ _0"> </span>National<span class="_ _0"> </span>Natural<span class="_ _1"> </span>Science<span class="_ _0"> </span>Foundation<span class="_ _1"> </span>of<span class="_ _0"> </span>China<span class="_ _0"> </span>under<span class="_ _1"> </span>Grant<span class="_ _0"> </span>61571267,<span class="_ _0"> </span>in<span class="_ _1"> </span>part<span class="_ _0"> </span>by<span class="_ _0"> </span>the<span class="_ _1"> </span>National<span class="_ _0"> </span>High</div><div class="t m0 x1 h9 y13 ff5 fs7 fc0 sc0 ls0 ws0">T<span class="_ _2"></span>echnology<span class="_ _0"> </span>Research<span class="_ _1"> </span>and<span class="_ _0"> </span>Dev<span class="_ _8"></span>elopment<span class="_ _0"> </span>Program<span class="_ _1"> </span>of<span class="_ _0"> </span>China<span class="_ _0"> </span>under<span class="_ _1"> </span>Grant<span class="_ _0"> </span>2014AA01A704,<span class="_ _0"> </span>in<span class="_ _1"> </span>part<span class="_ _0"> </span>by<span class="_ _0"> </span>the<span class="_ _1"> </span>Shenzhen<span class="_ _0"> </span>Peacock<span class="_ _0"> </span>Plan<span class="_ _1"> </span>under</div><div class="t m0 x1 h9 y14 ff5 fs7 fc0 sc0 ls0 ws0">Grant<span class="_ _0"> </span>1108170036003286,<span class="_ _1"> </span>and<span class="_ _0"> </span>in<span class="_ _0"> </span>part<span class="_ _1"> </span>by<span class="_ _0"> </span>the<span class="_ _0"> </span>Shenzhen<span class="_ _1"> </span>V<span class="_ _8"></span>isible<span class="_ _0"> </span>Light<span class="_ _1"> </span>Communication<span class="_ _0"> </span>System<span class="_ _0"> </span>K<span class="_ _8"></span>ey<span class="_ _1"> </span>Laboratory<span class="_ _0"> </span>under<span class="_ _0"> </span>Grant</div><div class="t m0 x1 h9 y15 ff5 fs7 fc0 sc0 ls0 ws0">ZDSYS20140512114229398.<span class="_ _0"> </span>The<span class="_ _1"> </span>work<span class="_ _0"> </span>of<span class="_ _1"> </span>L.<span class="_ _0"> </span>Hanzo<span class="_ _0"> </span>was<span class="_ _1"> </span>supported<span class="_ _0"> </span>in<span class="_ _0"> </span>part<span class="_ _1"> </span>by<span class="_ _0"> </span>the<span class="_ _0"> </span>EPSRC<span class="_ _1"> </span>Projects,<span class="_ _0"> </span>EP/Noo4558/1<span class="_ _0"> </span>and<span class="_ _1"> </span>EP/PO34284/1,</div><div class="t m0 x1 h9 y16 ff5 fs7 fc0 sc0 ls0 ws0">in<span class="_ _0"> </span>part<span class="_ _1"> </span>by<span class="_ _0"> </span>the<span class="_ _0"> </span>Royal<span class="_ _1"> </span>Society&#8217;<span class="_ _2"></span>s<span class="_ _0"> </span>GRCF<span class="_ _2"></span>,<span class="_ _0"> </span>and<span class="_ _1"> </span>in<span class="_ _0"> </span>part<span class="_ _0"> </span>by<span class="_ _1"> </span>the<span class="_ _0"> </span>European<span class="_ _0"> </span>Research<span class="_ _1"> </span>Council&#8217;s<span class="_ _1"> </span>Advanced<span class="_ _1"> </span>Fellow<span class="_ _1"> </span>Grant<span class="_ _0"> </span>QuantCom.</div><div class="t m0 xd ha y17 ff6 fs8 fc1 sc0 ls0 ws0">ABSTRACT<span class="_ _4"> </span><span class="ff5 fc0">A<span class="_ _5"> </span>partially<span class="_ _6"> </span>activ<span class="_ _2"></span>ated<span class="_ _6"> </span>conjugate<span class="_ _5"> </span>beamforming<span class="_ _6"> </span>(P<span class="_ _3"></span>ACB)<span class="_ _6"> </span>is<span class="_ _6"> </span>proposed<span class="_ _6"> </span>for<span class="_ _5"> </span>massi<span class="_ _2"></span>ve<span class="_ _6"> </span>multiple-input</span></div><div class="t m0 xd hb y18 ff5 fs8 fc0 sc0 ls0 ws0">multiple-output<span class="_ _1"> </span>communications,<span class="_ _1"> </span>where<span class="_ _0"> </span>the<span class="_ _1"> </span>line-of-sight<span class="_ _1"> </span>(LoS)<span class="_ _1"> </span>channel<span class="_ _1"> </span>is<span class="_ _0"> </span>dominant.<span class="_ _1"> </span>Unlike<span class="_ _1"> </span>the<span class="_ _1"> </span>con<span class="_ _2"></span>ventional</div><div class="t m0 xd hb y19 ff5 fs8 fc0 sc0 ls0 ws0">conjugate<span class="_ _6"> </span>beamforming<span class="_ _6"> </span>which<span class="_ _6"> </span>acti<span class="_ _2"></span>vates<span class="_ _6"> </span>all<span class="_ _6"> </span>the<span class="_ _6"> </span>antenna<span class="_ _6"> </span>elements<span class="_ _6"> </span>to<span class="_ _6"> </span>radiate<span class="_ _6"> </span>the<span class="_ _6"> </span>signals,<span class="_ _6"> </span>our<span class="_ _6"> </span>P<span class="_ _3"></span>A<span class="_ _2"></span>CB<span class="_ _6"> </span>activ<span class="_ _2"></span>ates</div><div class="t m0 xd hb y1a ff5 fs8 fc0 sc0 ls0 ws0">only<span class="_ _9"> </span>a<span class="_ _9"> </span>fraction<span class="_ _9"> </span>of<span class="_ _9"> </span>the<span class="_ _9"> </span>antennas<span class="_ _9"> </span>by<span class="_ _9"> </span>exploiting<span class="_ _9"> </span>the<span class="_ _9"> </span>spatial<span class="_ _9"> </span>structure<span class="_ _9"> </span>of<span class="_ _9"> </span>LoS<span class="_ _9"> </span>channel,<span class="_ _9"> </span>and<span class="_ _9"> </span>it<span class="_ _9"> </span>can<span class="_ _9"> </span>mitigate</div><div class="t m0 xd hb y1b ff5 fs8 fc0 sc0 ls0 ws0">the<span class="_ _6"> </span>inter-user<span class="_ _6"> </span>interference<span class="_ _6"> </span>more<span class="_ _6"> </span>effecti<span class="_ _2"></span>vely<span class="_ _2"></span>,<span class="_ _6"> </span>leading<span class="_ _6"> </span>to<span class="_ _6"> </span>dramatically<span class="_ _5"> </span>enhanced<span class="_ _6"> </span>do<span class="_ _2"></span>wnlink<span class="_ _5"> </span>spectral<span class="_ _6"> </span>ef<span class="_ _8"></span>&#64257;ciency<span class="_ _2"></span>.</div><div class="t m0 xd hb y1c ff5 fs8 fc0 sc0 ls0 ws0">A<span class="_ _0"> </span>low-comple<span class="_ _2"></span>xity<span class="_ _a"> </span>search<span class="_ _0"> </span>algorithm<span class="_ _0"> </span>is<span class="_ _a"> </span>also<span class="_ _0"> </span>introduced<span class="_ _0"> </span>to<span class="_ _0"> </span>calculate<span class="_ _a"> </span>the<span class="_ _0"> </span>optimal<span class="_ _0"> </span>number<span class="_ _0"> </span>of<span class="_ _a"> </span>acti<span class="_ _8"></span>vated<span class="_ _1"> </span>antennas.</div><div class="t m0 xd hb y1d ff5 fs8 fc0 sc0 ls0 ws0">Theoretical<span class="_ _0"> </span>analysis<span class="_ _a"> </span>and<span class="_ _0"> </span>simulation<span class="_ _a"> </span>results<span class="_ _0"> </span>both<span class="_ _a"> </span>con&#64257;rm<span class="_ _0"> </span>that<span class="_ _a"> </span>our<span class="_ _0"> </span>P<span class="_ _2"></span>A<span class="_ _2"></span>CB<span class="_ _0"> </span>offers<span class="_ _0"> </span>signi&#64257;cantly<span class="_ _a"> </span>higher<span class="_ _0"> </span>downlink</div><div class="t m0 xd hb y1e ff5 fs8 fc0 sc0 ls0 ws0">spectral<span class="_ _a"> </span>ef&#64257;cienc<span class="_ _8"></span>y<span class="_ _a"> </span>compared<span class="_ _6"> </span>to<span class="_ _a"> </span>its<span class="_ _a"> </span>conv<span class="_ _2"></span>entional<span class="_ _6"> </span>beamforming<span class="_ _a"> </span>counterpart.</div><div class="t m0 xd ha y1f ff6 fs8 fc1 sc0 ls0 ws0">INDEX<span class="_ _4"> </span>TERMS<span class="_ _b"> </span><span class="ff5 fc0">Partially-acti<span class="_ _2"></span>vated<span class="_ _c"> </span>conjugate<span class="_ _c"> </span>beamforming,<span class="_ _c"> </span>line-of-sight,<span class="_ _c"> </span>massive<span class="_ _c"> </span>MIMO,<span class="_ _c"> </span>inter-user</span></div><div class="t m0 xd hb y20 ff5 fs8 fc0 sc0 ls0 ws0">interference.</div><div class="t m0 xe hc y21 ff6 fs9 fc1 sc0 ls0 ws0">I.<span class="_ _d"> </span>INTRODUCTION</div><div class="t m0 x1 hb y22 ff5 fs8 fc0 sc0 ls0 ws0">Massiv<span class="_ _2"></span>e<span class="_ _4"> </span>multiple-input<span class="_ _4"> </span>multiple-output<span class="_ _4"> </span>(MIMO)<span class="_ _4"> </span>of<span class="_ _2"></span>fers<span class="_ _4"> </span>a</div><div class="t m0 x1 hb y23 ff5 fs8 fc0 sc0 ls0 ws0">promising<span class="_ _5"> </span>technology<span class="_ _6"> </span>for<span class="_ _5"> </span>the<span class="_ _6"> </span>next<span class="_ _5"> </span>generation<span class="_ _6"> </span>wireless<span class="_ _5"> </span>com-</div><div class="t m0 x1 hb y24 ff5 fs8 fc0 sc0 ls0 ws0">munication<span class="_ _6"> </span>systems<span class="_ _a"> </span>[1]&#8211;[4].<span class="_ _6"> </span>Because<span class="_ _6"> </span>the<span class="_ _6"> </span>asymptotic<span class="_ _6"> </span>orthog-</div><div class="t m0 x1 hb y25 ff5 fs8 fc0 sc0 ls0 ws0">onality<span class="_ _c"> </span>is<span class="_ _c"> </span>achiev<span class="_ _2"></span>able<span class="_ _c"> </span>by<span class="_ _c"> </span>employing<span class="_ _c"> </span>a<span class="_ _c"> </span>large-scale<span class="_ _c"> </span>antenna</div><div class="t m0 x1 hb y26 ff5 fs8 fc0 sc0 ls0 ws0">array<span class="_ _4"> </span>at<span class="_ _e"> </span>the<span class="_ _e"> </span>base<span class="_ _4"> </span>station<span class="_ _e"> </span>(BS),<span class="_ _4"> </span>massiv<span class="_ _2"></span>e<span class="_ _4"> </span>MIMO<span class="_ _e"> </span>is<span class="_ _4"> </span>capa-</div><div class="t m0 x1 hb y27 ff5 fs8 fc0 sc0 ls0 ws0">ble<span class="_ _9"> </span>of<span class="_ _9"> </span>enhancing<span class="_ _f"> </span>both<span class="_ _f"> </span>the<span class="_ _9"> </span>spectral<span class="_ _9"> </span>and<span class="_ _f"> </span>energy<span class="_ _9"> </span>ef<span class="_ _2"></span>&#64257;ciencies</div><div class="t m0 x1 hb y28 ff5 fs8 fc0 sc0 ls0 ws0">signi&#64257;cantly<span class="_ _d"> </span>with<span class="_ _c"> </span>the<span class="_ _c"> </span>aid<span class="_ _c"> </span>of<span class="_ _d"> </span>linear<span class="_ _c"> </span>signal<span class="_ _c"> </span>processing<span class="_ _c"> </span>[2].</div><div class="t m0 x1 hb y29 ff5 fs8 fc0 sc0 ls0 ws0">For<span class="_ _f"> </span>e<span class="_ _2"></span>xample,<span class="_ _f"> </span>the<span class="_ _f"> </span>conjugate<span class="_ _f"> </span>beamforming<span class="_ _f"> </span>(CB)<span class="_ _f"> </span>can<span class="_ _f"> </span>be<span class="_ _f"> </span>uti-</div><div class="t m0 x1 hb y2a ff5 fs8 fc0 sc0 ls0 ws0">lized<span class="_ _a"> </span>to<span class="_ _a"> </span>effecti<span class="_ _2"></span>vely<span class="_ _a"> </span>eliminate<span class="_ _a"> </span>the<span class="_ _a"> </span>inter-user<span class="_ _a"> </span>interference<span class="_ _a"> </span>(IUI)</div><div class="t m0 x1 hb y2b ff5 fs8 fc0 sc0 ls0 ws0">between<span class="_ _5"> </span>the<span class="_ _f"> </span>uncorrelated<span class="_ _5"> </span>channels<span class="_ _5"> </span>from<span class="_ _f"> </span>dif<span class="_ _2"></span>ferent<span class="_ _10"> </span>users<span class="_ _5"> </span>[3].</div><div class="t m0 x1 hb y2c ff5 fs8 fc0 sc0 ls0 ws0">T<span class="_ _2"></span>o<span class="_ _d"> </span>ensure<span class="_ _d"> </span>the<span class="_ _d"> </span>asymptotic<span class="_ _c"> </span>orthogonality<span class="_ _d"> </span>requires<span class="_ _d"> </span>the<span class="_ _c"> </span>rich-</div><div class="t m0 x1 hb y2d ff5 fs8 fc0 sc0 ls0 ws0">scattering<span class="_ _5"> </span>channel<span class="_ _5"> </span>en<span class="_ _2"></span>vironment,<span class="_ _5"> </span>which<span class="_ _5"> </span>is<span class="_ _5"> </span>generally<span class="_ _5"> </span>the<span class="_ _5"> </span>case</div><div class="t m0 x1 hb y2e ff5 fs8 fc0 sc0 ls0 ws0">in<span class="_ _c"> </span>current<span class="_ _c"> </span>wireless<span class="_ _c"> </span>communication<span class="_ _e"> </span>systems.<span class="_ _c"> </span>In<span class="_ _c"> </span>this<span class="_ _c"> </span>case,</div><div class="t m0 x1 hb y2f ff5 fs8 fc0 sc0 ls0 ws0">the<span class="_ _d"> </span>non-line-of-sight<span class="_ _c"> </span>(NLoS)<span class="_ _c"> </span>component<span class="_ _d"> </span>is<span class="_ _c"> </span>dominant<span class="_ _d"> </span>and</div><div class="t m0 x1 hb y30 ff5 fs8 fc0 sc0 ls0 ws0">the<span class="_ _d"> </span>wireless<span class="_ _d"> </span>channel<span class="_ _d"> </span>can<span class="_ _d"> </span>be<span class="_ _d"> </span>modeled<span class="_ _d"> </span>approximately<span class="_ _d"> </span>by<span class="_ _d"> </span>a</div><div class="t m0 x1 hb y31 ff5 fs8 fc0 sc0 ls0 ws0">Gaussian<span class="_ _9"> </span>distribution<span class="_ _9"> </span>with<span class="_ _9"> </span>low<span class="_ _f"> </span>correlation<span class="_ _d"> </span>between<span class="_ _9"> </span>differ<span class="_ _2"></span>-</div><div class="t m0 x1 hb y32 ff5 fs8 fc0 sc0 ls0 ws0">ent<span class="_ _9"> </span>users<span class="_ _f"> </span>[1],<span class="_ _9"> </span>[2].<span class="_ _9"> </span>T<span class="_ _11"></span>o<span class="_ _9"> </span>fully<span class="_ _f"> </span>explore<span class="_ _9"> </span>the<span class="_ _f"> </span>potential<span class="_ _9"> </span>of<span class="_ _9"> </span>spatial</div><div class="t m0 x1 hb y33 ff5 fs8 fc0 sc0 ls0 ws0">div<span class="_ _2"></span>ersity<span class="_ _0"> </span>and<span class="_ _0"> </span>multiplexing<span class="_ _0"> </span>gains<span class="_ _0"> </span>provided<span class="_ _1"> </span>by<span class="_ _0"> </span>NLoS<span class="_ _0"> </span>channels,</div><div class="t m0 x1 hb y34 ff5 fs8 fc0 sc0 ls0 ws0">advanced<span class="_ _10"> </span>beamforming<span class="_ _f"> </span>and<span class="_ _f"> </span>precoding<span class="_ _f"> </span>methodologies<span class="_ _f"> </span>have</div><div class="t m0 xf hb y21 ff5 fs8 fc0 sc0 ls0 ws0">been<span class="_ _1"> </span>proposed<span class="_ _0"> </span>to<span class="_ _1"> </span>enhance<span class="_ _0"> </span>the<span class="_ _1"> </span>performance<span class="_ _0"> </span>of<span class="_ _1"> </span>massiv<span class="_ _8"></span>e<span class="_ _1"> </span>MIMO</div><div class="t m0 xf hb y35 ff5 fs8 fc0 sc0 ls0 ws0">systems<span class="_ _a"> </span>[3],<span class="_ _6"> </span>[5]&#8211;[7].</div><div class="t m0 x10 hb y36 ff5 fs8 fc0 sc0 ls0 ws0">Howe<span class="_ _2"></span>ver<span class="_ _2"></span>,<span class="_ _c"> </span>in<span class="_ _c"> </span>many<span class="_ _c"> </span>new<span class="_ _c"> </span>wireless<span class="_ _c"> </span>communication<span class="_ _c"> </span>appli-</div><div class="t m0 xf hb y37 ff5 fs8 fc0 sc0 ls0 ws0">cations,<span class="_ _c"> </span>the<span class="_ _c"> </span>line-of-sight<span class="_ _e"> </span>(LoS)<span class="_ _c"> </span>channel<span class="_ _c"> </span>is<span class="_ _e"> </span>dominant.<span class="_ _c"> </span>For</div><div class="t m0 xf hb y25 ff5 fs8 fc0 sc0 ls0 ws0">example,<span class="_ _f"> </span>in<span class="_ _f"> </span>air-to-air<span class="_ _f"> </span>communications,<span class="_ _9"> </span>the<span class="_ _f"> </span>LoS<span class="_ _9"> </span>channel<span class="_ _f"> </span>is</div><div class="t m0 xf hb y38 ff5 fs8 fc0 sc0 ls0 ws0">predominant<span class="_ _a"> </span>with<span class="_ _6"> </span>litter<span class="_ _a"> </span>or<span class="_ _6"> </span>no<span class="_ _a"> </span>scattering<span class="_ _6"> </span>component<span class="_ _a"> </span>[8].<span class="_ _6"> </span>Also</div><div class="t m0 xf hb y39 ff5 fs8 fc0 sc0 ls0 ws0">LoS<span class="_ _6"> </span>channels<span class="_ _6"> </span>are<span class="_ _6"> </span>widely<span class="_ _5"> </span>appro<span class="_ _8"></span>ved<span class="_ _6"> </span>in<span class="_ _6"> </span>unmanned<span class="_ _6"> </span>aerial<span class="_ _6"> </span>vehi-</div><div class="t m0 xf hb y3a ff5 fs8 fc0 sc0 ls0 ws0">cle<span class="_ _9"> </span>(U<span class="_ _2"></span>A<span class="_ _3"></span>V)<span class="_ _f"> </span>communications<span class="_ _9"> </span>[9],<span class="_ _9"> </span>[10].<span class="_ _9"> </span>Firstly<span class="_ _11"></span>,<span class="_ _9"> </span>LoS<span class="_ _9"> </span>links<span class="_ _9"> </span>in</div><div class="t m0 xf hb y3b ff5 fs8 fc0 sc0 ls0 ws0">low-altitude<span class="_ _0"> </span>U<span class="_ _2"></span>A<span class="_ _3"></span>V<span class="_ _3"></span>-ground<span class="_ _0"> </span>channels<span class="_ _0"> </span>are<span class="_ _a"> </span>mostly<span class="_ _0"> </span>preferred<span class="_ _a"> </span>[10].</div><div class="t m0 xf hb y3c ff5 fs8 fc0 sc0 ls0 ws0">In<span class="_ _e"> </span>addition,<span class="_ _4"> </span>the<span class="_ _e"> </span>U<span class="_ _2"></span>A<span class="_ _3"></span>V<span class="_ _3"></span>-U<span class="_ _2"></span>A<span class="_ _3"></span>V<span class="_ _e"> </span>and<span class="_ _4"> </span>U<span class="_ _2"></span>A<span class="_ _3"></span>V<span class="_ _3"></span>-BS<span class="_ _e"> </span>backhaul<span class="_ _e"> </span>chan-</div><div class="t m0 xf hb y2b ff5 fs8 fc0 sc0 ls0 ws0">nels<span class="_ _d"> </span>are<span class="_ _d"> </span>dominated<span class="_ _d"> </span>by<span class="_ _d"> </span>LoS<span class="_ _d"> </span>components<span class="_ _d"> </span>as<span class="_ _c"> </span>well,<span class="_ _d"> </span>wherein</div><div class="t m0 xf hb y3d ff5 fs8 fc0 sc0 ls0 ws0">the<span class="_ _9"> </span>emerging<span class="_ _9"> </span>millimeter-w<span class="_ _2"></span>ave<span class="_ _9"> </span>(mmW<span class="_ _11"></span>ave)<span class="_ _9"> </span>MIMO<span class="_ _9"> </span>technol-</div><div class="t m0 xf hb y3e ff5 fs8 fc0 sc0 ls0 ws0">ogy<span class="_ _d"> </span>is<span class="_ _d"> </span>utilized<span class="_ _9"> </span>to<span class="_ _d"> </span>achieve<span class="_ _9"> </span>the<span class="_ _d"> </span>high-rate<span class="_ _d"> </span>transmissions<span class="_ _d"> </span>[9].</div><div class="t m0 xf hb y3f ff5 fs8 fc0 sc0 ls0 ws0">In<span class="_ _f"> </span>mmW<span class="_ _11"></span>ave<span class="_ _9"> </span>communications,<span class="_ _f"> </span>the<span class="_ _9"> </span>pathloss<span class="_ _f"> </span>of<span class="_ _9"> </span>NLoS<span class="_ _f"> </span>chan-</div><div class="t m0 xf hb y40 ff5 fs8 fc0 sc0 ls0 ws0">nels<span class="_ _f"> </span>is<span class="_ _10"> </span>relatively<span class="_ _10"> </span>high,<span class="_ _f"> </span>and<span class="_ _f"> </span>LoS<span class="_ _f"> </span>signals<span class="_ _10"> </span>are<span class="_ _f"> </span>mainly<span class="_ _f"> </span>consid-</div><div class="t m0 xf hb y41 ff5 fs8 fc0 sc0 ls0 ws0">ered<span class="_ _9"> </span>[11]&#8211;[13].<span class="_ _9"> </span>The<span class="_ _9"> </span>asymptotic<span class="_ _9"> </span>orthogonality<span class="_ _9"> </span>is<span class="_ _9"> </span>inv<span class="_ _2"></span>alid<span class="_ _9"> </span>in</div><div class="t m0 xf hb y42 ff5 fs8 fc0 sc0 ls0 ws0">LoS<span class="_ _6"> </span>scenarios<span class="_ _6"> </span>due<span class="_ _5"> </span>to<span class="_ _6"> </span>the<span class="_ _6"> </span>higher<span class="_ _5"> </span>correlation<span class="_ _6"> </span>between<span class="_ _6"> </span>various</div><div class="t m0 xf hb y43 ff5 fs8 fc0 sc0 ls0 ws0">channels<span class="_ _f"> </span>from<span class="_ _f"> </span>dif<span class="_ _8"></span>ferent<span class="_ _f"> </span>users<span class="_ _f"> </span>[12],<span class="_ _f"> </span>which<span class="_ _10"> </span>results<span class="_ _f"> </span>in<span class="_ _f"> </span>higher</div><div class="t m0 xf hb y44 ff5 fs8 fc0 sc0 ls0 ws0">residual<span class="_ _6"> </span>IUI<span class="_ _6"> </span>and<span class="_ _5"> </span>spectral<span class="_ _6"> </span>ef<span class="_ _8"></span>&#64257;ciency<span class="_ _6"> </span>(SE)<span class="_ _6"> </span>loss.<span class="_ _6"> </span>Thus<span class="_ _5"> </span>the<span class="_ _6"> </span>con-</div><div class="t m0 xf hb y45 ff5 fs8 fc0 sc0 ls0 ws0">ventional<span class="_ _6"> </span>low-complexity<span class="_ _6"> </span>analogue<span class="_ _5"> </span>CB<span class="_ _5"> </span>suf<span class="_ _2"></span>fers<span class="_ _5"> </span>from<span class="_ _5"> </span>serious</div><div class="t m0 x1 h2 y46 ff1 fs0 fc0 sc0 ls0 ws0">56504</div><div class="t m0 x6 hd y47 ff1 fs1 fc0 sc0 ls0 ws0">This<span class="_ _1"> </span>work<span class="_ _1"> </span>is<span class="_ _0"> </span>licensed<span class="_ _1"> </span>under<span class="_ _1"> </span>a<span class="_ _1"> </span>Creative<span class="_ _1"> </span>Commons<span class="_ _0"> </span>Attribution<span class="_ _1"> </span>3.0<span class="_ _1"> </span>License.<span class="_ _a"> </span>For<span class="_ _1"> </span>more<span class="_ _1"> </span>information,<span class="_ _0"> </span>see<span class="_ _1"> </span>http://creativecommons.org/licenses/by/3.0/</div><div class="t m0 x11 hd y46 ff1 fs1 fc0 sc0 ls0 ws0">VOLUME<span class="_ _1"> </span>6,<span class="_ _1"> </span>2018</div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.666667,0.000000,0.000000,1.666667,0.000000,0.000000]}'></div></div> </body> </html>
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