60ghz毫米波宽带无线通信系统中的天线空间分集和极化失配

《60ghz毫米波宽带无线通信系统中的天线空间分集和极化失配》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、highqualityvoicetohigh-definitionvideotohi曲一data—ratewirelesschannels．AsthespectruminthelOWmicrowavefrequenciesgoescongested，movingtothelargelyunusedspectrumatmillimeterwavefrequencieswillavoidtheinterferencefromtheotherradiosystemsandhavepotentialtoachieveaspeed

2、wirelesscommunicationsystem．Ofthemillimeter-wave(MMW)frequencies，particularlyinterestedisthe60．GHzband．whichiSprovidedasanunlicensedbandinmanycountriessuchasJapan(59—66GHz)，UnitedStates(57—64GHz)，andEurope(57·66GHz)o¨．Thisisthelargestcontiguousblockofradiospectru

3、meverallocated．Immenseresearchanddevelopmentonthemillimeter-wavedevices，circuits，antennas，andmoduleshavebeendoneinrecentlyyears．Thispaperpresentsastudyonthefadingbehaviorinwideband60GHz．Millimeter-wave(MMW’)wirelesssystem．Theevaluationiscarriedoutbasedonatwo-rayp

4、ropagationmodel，withconsideringthelargepropagationlossofthemulti—reflectedwavesotherthanthefirstreflectedwaveat60GHz．millimeter-wave．Thestudyfocusesonthestrongfadingeffectduetothelargevariationofantennalocationcomparedtotheshortwavelength(about5mm)andthewidefrequ

5、encyrange(about9GHz)insuchMMWwirelesssystem．TheinfluenceofthepolafizationmismatchofantennaiSalsoinvestigated．Toreducethefading，weemploythetechniqueofspacediversitybyintroducingtwoormoreantennasinreceivingside．Weperforrnanoptimizationofthelocations(heights)forthes

6、eantennas．Fromthesimulationresults．weiii北京邮电大学硕士研究生论文60GHz毫米波宽带无线通信系统中的天线空问分集和极化失配obtainsomeoptimalheightswithwhichthefadingeffectcanbereducedinlessthan3dB．Thesimulationresultsalsorevealhowthepolarizationmismatch，intwodifferentcasesofantennarotations，influencesth

7、esystemperformance，andhowspacediversityreducethefadingaswell．TheantennausedinsimulationiSaplanarpatchantennawhichiSconsideredsuitableforportablewirelesshandset．TheradiationpatterniSobtainedfromelectromagneticsimulation．Thispaperdemonstratesthatbyemployingmultiple

8、antennaswithoptimizedantennalocationscansignificantlyreducethefadingforthe60GHz—MMWwirelesssystem．KEYWORDS：60GHz-Millimeter-waveFadingSpaceDiversityPolarizatio