基帶傳輸系統(tǒng)的均衡技術(shù)研究-畢業(yè)論文

1、摘要摘要現(xiàn)今，基帶傳輸系統(tǒng)雖然不如頻帶傳輸應(yīng)用廣泛，但在短距離有線信道通信（如計(jì)算機(jī)網(wǎng)線）中，仍將基帶傳輸作為主要的傳輸方式。在實(shí)際的基帶傳輸中，由于濾波器的設(shè)計(jì)誤差和信道特性的不理想，無法使基帶傳輸總特性滿足奈奎斯特第一準(zhǔn)則，從而產(chǎn)生碼間串?dāng)_。碼間串?dāng)_的產(chǎn)生會(huì)引起波形的失真，使傳輸系統(tǒng)的性能下降。本文從消除碼間串?dāng)_的無失真輸出條件出發(fā)，通過研究濾波器的設(shè)計(jì)問題，使濾波器的頻率特性能夠校正和補(bǔ)償基帶傳輸系統(tǒng)的傳輸特性，從而盡可能滿足無失

2、真輸出的條件，減少碼間串?dāng)_的影響。首先從理論上介紹了基帶傳輸系統(tǒng)的基本模型，碼間串?dāng)_產(chǎn)生的原因，均衡技術(shù)的基本思想等，然后通過采用MATLAB中的Simulink仿真平臺(tái)，對(duì)基帶傳輸系統(tǒng)進(jìn)行了建模仿真。通過研究群時(shí)延產(chǎn)生的方法，從而來模擬碼間串?dāng)_的產(chǎn)生。接著根據(jù)均衡的基本思想來設(shè)計(jì)均衡濾波器，從而完成對(duì)整個(gè)課題的仿真。最后分別從眼圖和誤碼率兩方面，對(duì)整個(gè)系統(tǒng)的均衡效果進(jìn)行定性和定量的衡量，完成對(duì)整個(gè)課題的性能驗(yàn)證。關(guān)鍵詞：基帶傳輸關(guān)鍵詞

3、：基帶傳輸碼間串?dāng)_碼間串?dāng)_均衡技術(shù)均衡技術(shù)SimulinkABSTRACTABSTRACTTodaybasebtransmissionbtransmissionsystemalthoughnotaswidelyusedbutintheshtdistancecablechannelcommunication(suchasacomputerwkcable)willcontinuetobasebtransmissionasthemainmea

4、nsoftransmission.IntheactualbasebtransmissionduetodesignerrsidealchannelacteristicofthefilteritcannotmakethetotalbasebtransmissionacteristicssatisfytheNyquistfirstcriterionresultinginISI.ISIgenerationwillcausedisttionoft

5、hewavefmtheperfmanceofthetransmissionsystemdecreases.Thetexteliminateintersymbolinterferencedisttionfreeoutputconditionsetoutbydesigningafilterthefrequencyacteristicofthisfilteriscapableofcrectingtransmissionacteristicco

6、mpensationsystemsoastomeettheconditionsofdisttionfreeoutputreduceintersymbolinterference.ThetextintroducesthebasictheymodelbasebtransmissionsystembecauseISIproducedthebasicideaofequalizationetc.thenbyusingtheMATLABSimuli

7、nksimulationplatfmfbasebtransmissionsystemmodelingsimulation.ThemethodofgeneratingdelaybyresearchgroupwhichsimulatesISIgeneration.Thenaccdingtothebasicideaofabalanceddesignequalizationfiltersthuscompletingthewholeissueof

8、simulation.Finallyrespectivelyfromtheeyebiterrratecalculattwoaspectstheeffectontheequilibriumofthesystemfqualitativequantitativemeasurementcompleteperfmanceverificationoftheentiresubject.Keywds:basebtransmissionISIequali