无线通信论文

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1、PartiallyOverlappedChannelsNotConsideredHarmful部分重叠信道不具伤害性ABSTRACTManywirelesschannelsindifferenttechnologiesareknowntohavepartialoverlap・However,duetotheinterferenceeffectsamongsuchpartiallyoverlappedchannels,theirsimultaneoususehastypicallybeenavoided.Inthispaper,wepresentafirst

2、attempttomodelpartialoverlapbetweenchannelsinasystematicmanner・Throughthemodel,weillustratethattheuseofpartiallyoverlappedchannelsisnotalwaysharmful.Infact,acarefuluseofsomepartiallyoverlappedchannelscanoftenleadtosignificantimprovementsinspectrumutilizationandapplicationperforman

3、ce・Wedemonstratethisthroughanalysisaswellasthroughdetailedapplication-levelandMAC-levelmeasurements・Additionally,weillustratethebenefitsofourdevelopedmodelbyusingittodirectlyenhancetheperformanceoftwopreviouslyproposedchannelassignmentalgorithms—oneinthecontextofwirelessLANsandthe

4、otherinthecontextofmulti-hopwirelessmeshnetworks.Throughdetailedsimulations,weshowthatuseofpartiallyoverlappedchannelsinboththesecasescanimproveend-to-endapplicationthroughputbyfactorsbetween1.6and2.7indifferentscenarios,dependingonwirelessnodedensity.Weconcludebyobservingthatthen

5、otionofpartialoverlapcanbetherightmodelofflexibilitytodesignefficientchannelaccessmechanismsintheemergingsoftwareradioplatforms.摘要我们知道在不同的技术屮许多无线信道会有部分重叠。然而，由于在这样的部分重叠信道屮的干扰影响，通常被避免它们同时使用。在木文屮，我们提出了用系统的方法首次尝试模拟信道Z间部分重叠。通过该模型，我们说明了使用部分重證的通道并不总是有害的。事实上，如果谨慎使用一些部分重叠的信道常常会带来频谱利用率和应用性能

6、的显著改善。我们证明这一观点通过分析，以及通过详细的应用层和MAC层的测量。另外，我们说明了我们开发的模型的好处通过川它來直接增强两个先前提出的信道分配算法的性能——在无线局域网和其它的在多跳无线网状网络。通过详细的模拟，我们表明这两种情况下利用部分重叠的信道可以在不同的情况下提窩终端到终端的应用吞吐量因了在1.6和2.7Z间，这取决于无线节点密度。最后，我们通过观察得出部分重叠的概念正好可以灵活的来设计高效的信道接入机制在新兴的软件无线电平台。KeywordsIEEE802.11,channelassignment,partiallyoverlapped

7、channels.关键词IEEE802.1b信道分配，部分地重叠通道。LimitTransmitPowerFrequency(GHz)Frequency(GH耳Frequency(GHZ)(a)Nooverlappingchannels(Meal)(b)Norvowrlapplngchannels(actual){c)Panlallyowlapplr>gchannels(acwal)图一，部分重叠和不重叠信道为了正确的解决发送机在无线介质上传输的竞争，许多无线技术采川双重做法。首先，分裂频谱频带为子范围被称为“信道并且每个发射机（和其和应的接收器）占用这些

8、信道屮的某一个。显然，在发送机数量与信道数量不相符时，还会出现争用