无线通信网络的跨层设计

本科毕业论文题目无线通信网络的跨层设计学生姓名：周强专业：通信工程指导教师：曹张华完成日期：2011年6月2日诚信承诺书本人承诺：所呈交的论文是本人在导师指导下进行的研究成果。除了文中特别加以标注和致谢的地方外，论文中不包含其他人已发表或撰写过的研究成果。参与同一工作的其他同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示了谢意。签名：日期：本论文使用授权说明本人完全了解南通大学有关保留、使用学位论文的规定，即：学校有权保留论文及送交论文复印件，允许论文被查阅和借阅；学校可以公布论文的全部或部分内容。（保密的论文在解密后应遵守此规定）学生签名：指导教师签名：日期：南通大学本科毕业设计（论文）I摘要人们对便捷通信的强烈渴望推动了无线通信技术的飞速发展。现阶段的无线通信产业主要集中在话音业务上，但随着与爆炸式发展的因特网融合的实现，无线通信业务范围将发展成多种业务结合的综合性业务。无线通信网络的跨层设计的主要任务是彻底改变原先固定不变的协议分层结构，将原来被割裂的网络各层作为同一的整体进行设计和优化，以便在时变的无线衰落信道中能够保证多媒体业务的QoS(QualityofService)变得切实可行。论文在研究跨层设计的基础之上，论述了跨层设计的背景、现状、原理以及跨层设计的实现方法等。重点介绍了点到点的跨层设计，即如何通过联合自适应(AMC,theadaptivemodulationandcoding)技术和混合自动请求重传(HARQ，hybridautomaticrepeatrequest)技术来优化系统的吞吐量、时延、丢包率。再通过计算机对理论分析进行了仿真验证。理论分析和仿真结果表明基于Type-IIIHARQ比ARQ能够有效的优化网络整体性能，具有较高的研究价值。关键词：跨层设计，服务质量，混合自动请求重传，自适应编码调制南通大学毕业设计（论文）IIABSTRACTPeople’sdesirationspromotetherapidgrowthofwirelesstechnologiesforprovidinganytime,anywherevoicecommunications.Atpresent,thewirelesscommunicationsindustryismainlyconcentratedonthevoicebusiness.ButwiththeexplosivegrowthoftheInternetandtherealizationofintegrationofwirelesscommunicationsandInternet,itwillbedevelopedintoacomprehensivekindofbusiness.Cross-layerdesignofwirelessnetworksistocompletelychangethemaintaskoftheoriginalfixedframeworkagreement,whichaimstobedividedbytheoriginalnetworkofthesamelayersastheoveralldesignandoptimization,inordertoguaranteeQoS(QualityofService)formultimediabusinessinthetime-varyingwirelessfadingchannel.Basedoncross-layerdesign,thisthesisdiscussestheconceptofcross-layerdesign,status,principlesandimplementationmethod.Withanemphasisonpointtopointcross-layerdesign,thatishowitunitestheadaptivemodulationandcoding(AMC,theadaptivemodulationandcoding)technologyandhybridautomaticrepeatrequest(HARQ,hybridautomaticrepeatrequest)techniquestooptimizethesystemthroughput.Thetheoreticalanalysisbycomputersimulationisverified.TheoreticalanalysisandsimulationshowthattheType-IIIHARQcanmuchmoreeffectivelyoptimizeoverallnetworkperformancethanARQ,whichisofhighresearchvalue.Keywords:Cross-layerdesign,QoS,HARQ,AMC南通大学毕业设计（论文）III目录摘要.........................................................................................................................................IABSTRACT................................................................................................................................II目录.........................................................................................................................................III第一章绪论.............................................................................................................................11.1研究的背景........................................................................................................................11.2跨层设计的必要性............................................................................................................11.2.1无线信道的动态特性................................................................................................11.2.2OSI开放系统参考模型的弊端.................................................................................21.2.3高误码率...................................................................................................................21.2.4带宽波动与限制........................................................................................................21.3各协议层之间对跨层设计的需求....................................................................................21.3.1基于物理层的协议层交互.......................................................................................21.3.2基于链路层的协议层交互.......................................................................................31.3.3基于网络层的协议层交互.......................................................................................31.3.4基于传输层的协议层交互.......................................................................................31.4链路自适应技术................................................................................................................41.4.1功率控制技术...........................................................................................................41.4.2速率控制技术...........................................................................................................41.4.3混合自动请求重传技术...........................................................................................51.5QoS管理.............................................................................................................................51.5.1QoS参数...................................................................................................................51.5.2QoS保证的基本要求...............................................................................................61.5.3QoS保证的基本策略...............................................................................................61.6跨层设计原理....................................................................................................................71.6.1开放系统互联模型.....................................................................................