礦井wmn多媒體應急通信系統(tǒng)多跳傳輸性能改進

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1、礦井WMN多媒體應急通信系統(tǒng)多跳傳輸性能改進摘要:由于礦井無線mesh網(wǎng)絡（wmn）多媒體應急通信系統(tǒng)的多跳傳輸存在基準帶寬較低、多跳傳輸帶寬衰減率較大的問題,對其多跳傳輸性能進行改進。提出了一種礦井wmn多媒體應急通信系統(tǒng)骨干傳輸鏈路的網(wǎng)絡結(jié)構(gòu),并建立了其傳輸模型,研究了對其傳輸性能產(chǎn)生影響的主要因素。提出了基于802.11n的多跳mesh骨干傳輸網(wǎng)絡的多模mesh節(jié)點結(jié)構(gòu),解決了礦井wmn多媒體應急通信系統(tǒng)多跳傳輸?shù)膬蓚€難題。實驗結(jié)果表明其具有超過165mbps的基準帶寬,并且在60mbps的限速應用環(huán)境下,每跳的帶寬衰減小于1%,基本滿足了礦井多

2、媒體業(yè)務傳輸?shù)膽眯枨?。關(guān)鍵詞:802.11n;應急通信系統(tǒng);多模;無線mesh網(wǎng)絡;多跳傳輸性能improvementonmultihopperformanceofundergroundmineemergencycommunicationsystembasedonwmnzhuquan1,2*,jiangxinhua1,zoufumin2,xushaofeng1(1.schoolofinformationscienceandengineering,centralsouthuniversity,changshahunan410

3、075,china;2.researchcenterfornextgenerationinternettechnologyandapplications,fujianuniversityoftechnology,fuzhoufujian350108,china)abstract:themultihoptransmissionofmultimediaemergencycommunicationsystembasedonwirelessmeshnetwork(wmn)inundergroundminehavetwoproblems:lowbasis

4、bandwidthandhighmultihoptransmissionattenuation.thispaperaimedtoimprovethemultihoptransmissionperformanceforthesystem.inthispaper,atrunklinenetworkstructureofmultimediaemergencycommunicationsystembasedonwmninundergroundminewasproposed.theauthorsestablisheditstransmissionmodel,a

5、ndthenhadaresearchonthemainfactorsthataffectedthetransmissionperformance.themultiradionodestructureofmultihopmeshbackbonenetworkbasedon802.11nwasproposedandsolvedthetwoproblemsofmultihoptransmission.theexperimentalresultsshowthatithasmorethan165mbpsbasisbandwidth,andundertheli

6、mited60mbpsenvironment,thebandwidthattenuationofperhopislessthan1%,basicallysatisfyingtheapplicationrequirementsofmultimediatransmissioninundergroundmine.keywords:802.11n;emergencycommunicationsystem;multiradio;wirelessmeshnetwork(wmn);multihoptransmissionperformance0引言無線寬帶網(wǎng)

7、絡，特別是無線mesh網(wǎng)絡(wirelessmeshnetwork,wmn)、無線傳感器網(wǎng)絡(wirelesssensornetwork,wsn)技術(shù)由于其投資省、組網(wǎng)方便靈活等一系列優(yōu)點,不僅在地面無線寬帶通信領(lǐng)域得到廣泛應用,而且在礦井通信系統(tǒng)中也得到了業(yè)界的廣泛關(guān)注和高度重視[1-7]。根據(jù)我國煤礦井下多媒體應急通信的迫切需求,文獻[1]在煤炭科學研究總院國際合作基金等項目資助下,利用最新的多跳wmn技術(shù)建立了礦井wmn多媒體應急通信系統(tǒng),并部分解決了多跳傳輸難題。但是,文獻[1]的實驗結(jié)果表明,該系統(tǒng)的基準帶寬最高僅為47.7mbps,特

8、別是多跳傳輸?shù)膸捤p依然十分嚴重,經(jīng)過10跳傳輸時其多跳帶寬僅為