基于降低公平性容量最大子載波分配算法畢業(yè)論文

1、摘要Ⅰ摘要隨著無線通信技術(shù)日新月異的發(fā)展，LTE網(wǎng)絡(luò)中頻譜利用率低下的問題越來越引人關(guān)注。針對(duì)這一問題，本文通過介紹認(rèn)知無線電頻譜檢測(cè)和分配技術(shù)，將認(rèn)知無線電和LTE關(guān)鍵技術(shù)OFDM相結(jié)合，在研究了基于比例公平容量最大子載波分配算法的基礎(chǔ)上，提出了基于降低公平性容量最大子載波分配算法。該算法針對(duì)前者系統(tǒng)的公平性和頻譜效率存在的缺陷提出了改進(jìn)，將子載波分配給信道條件最好的認(rèn)知用戶，同時(shí)該用戶的信道參數(shù)乘上分配因子，在兼顧了各個(gè)用戶接入公平

2、的條件下，使系統(tǒng)頻譜效率最大化。最后，將本算法與基于比例公平容量最大子載波分配算法進(jìn)行MATLAB仿真，得出本算法在系統(tǒng)頻譜效率上性能比基于比例公平容量最大子載波分配算法好的結(jié)論。關(guān)鍵詞：認(rèn)知無線電；LTE；頻譜分配；頻譜效率；MATLABABSTRACTⅡABSTRACTWiththerapiddevelopmentofwirelesscommunicationtechnologytheproblemoflowspectrumutil

3、izationinLTEwkisconcernedtoday.IndertodealwiththisproblemthispaperintroducesthetechnologyofspectrumdetectionallocationincognitiveradiowecombinethecognitiveradiotechnologyOFDMtechnologywhichisthekeytechnologyinLTEsystempr

4、oposedthelargestcapacityofsubcarrierallocationalgithmbaseonreducingthefairnessafterstudyingthelargestcapacityofsubcarrierallocationalgithmbaseonfairofproptional.Thisalgithmproposesimprovementsfocusingonthedefectinfairnes

5、sspectralefficiency.Firstweallocatethesubcarrierstocognitiveuserswithbestchannelconditionsthenmultiplyadistributionfacttothechannelparameterofthecognitiveuserwhoownsthesubcarrier.Intakingintoaccounttherespectiveuseracces

6、sunderfairconditions，wemaximumthespectralefficiency.FinallywecompareanalysisthefunctionofthetwoalgithmthroughMATLABsimulationfoundthatthelargestcapacityofsubcarrierallocationalgithmbaseonreducingthefairnessiswithbettersp