hc-mcm，pchc-mcm及相应的冲突恢复算法

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1、复旦大学博士学位论文HC-MCM，PC/HC-MCM及相应的冲突恢复算法姓名：侯亚飞申请学位级别：博士专业：计算机应用技术指导教师：张世永20070529复旦大学博士论文HC-MCM，PC／HC-MClVi及相应的冲突恢复算法来解调。因此，通过接收到的部分时域信号以及估计的无线信道信息可以重建系统在时域的全部信号。利用这个非常有利的性质，所有受冲突干扰受损的数据报都会以被恢复。同时该恢复算法在越弱的near-far效应下越能得到更好的恢复性能。而无线局域网，基于无线局域网ad-hoc网络的传输环境是短距通信，更加符合弱的near-far效应条件。因此这个算

2、法更加符合实际网络环境。而且可以通过延伸恢复算法去解决隐藏终端问题。该恢复算法将给无线网络，M-hoe网络的协议设计和性能提高提供一种新的高效的手段。关键词：多载波调制系统，OFDM，物理层自适应技术，PAPR，冲突干扰恢复，无线网络，高阶M-QAM。’复旦大学博士论文HC-MCM，Pc旃c．McM及相应的冲突恢复算法AbstractThisdissertationwillproposeanovelmultiearriersystemanddesignanewmultiearfiersystembycombiningtheparallelcombinato

3、rycoding．Ontheotherhand，basedontheflexiblemulticarriersystem，thisdissertationalsoproposesalleffectivemethodofcollisionrecoveryforOFDM-basedwirelessnetworkstosolvetheproblemofhiddenterminals．Theunderlyingphilosophyinallproblemsthatareconsideredinthisdissertationisasynergybetweenthe

4、physicalandtheMAClayers．hlthiSdissertation．firstly,wewillgivetheresultswhichshowthatthereismuchtobegainedfromadaptivemodulationandvariableframelengthintermsofgoodput．range．andenergyconsumptionforwirelessnetworks．Threemlesofdesignforsuchatradeoffareobtainedforwirelessnodes．Weutiliz

5、eoneruleforsavingtheenergyconsumption．ThesimulatedresultsshowthatflexibleIrausmissionincludingadaptivemodulationandvariablelengthofframeCanimprovethethroughputofsystem，savetheenergyconsumption,andobtainbettertransmissionarea．SincehighorderM-QAM似>64)iSseldomusedforwirelessnetworks．

6、Ontheotherhand，adaptivemodulationusingdifferentvalueofMwillimprovethedesign’Scomplexityandcost．Therefore，onenovelflexiblemulticarriersystem(HC—MCM：llighcompactionmulticarriermodulation)whichCallattainhigherbandwidthefficiency(BW-E)thanthatoftheOFDMsystemhasbeenproposedandextended．

7、TheHC—MCMCanflexiblycontrolthetransmissionrateandthecommunicationquality．Moreimportantly,onlyutilizingBPSKorQPSKmodulation，itCanadaptivelyachievethetransmissionrateofhi曲orderM-QAMOFDMandcontrolthelengthofflamebytransmittingvariablelengthofpartialtime-domainOFDMsignal．Thisdissertat

8、ionintroducesthebasicmathematical