| The research of the fifth generation mobile communication technology has become a hot spot in the whole communication industry.As one of the candidate waveforms for 5G technology,OFDM/OQAM has many advantages such as high spectral efficiency,less sidelobe leakage.It also can reduce ISI and ICI through the reconfigurable characteristics of the shaping filter.The optical wireless communication technology combines the advantages of wireless communication and optical fiber communication.It provides a basis for commercialization of 5G in the future.The main work of this thesis is to study and analyze the transmission of OFDM/OQAM signals in optical fiber bearing network.In this thesis,we analyze the advantages of this technology by building simulation system.It provides a reference for the transmission of OFDM/OQAM signals in optical fiber bearing network in engineering application.Firstly,this thesis introduces the technology about OFDM/OQAM.As one of the 5G physical layer candidate technologies,it has lots of advantages.Then the thesis analyzes three transmission schemes in optical fiber bearing network.It also compares the performance of OFDM/OQAM and OFDM by Matlab.Secondly,this thesis builds simulation system to analyze the transmission of OFDM/OQAM signals in optical fiber bearing network.The simulation system is builded through VPI simulation system and Matlab.And each step and principle is explained detailedly.The simulation proves the superiority of OFDM/OQAM modulation technology for 5G signals.the thesis also analyzes the influence of different parameters of the system on signal transmission.It proves that the application of optical fiber bearing network will have an irreplaceable role in the future 5G commercial process.Finally,the thesis proposes three schemes to solve the problem of fiber dispersion and high peak-to-average power ratio in system.In order to reduce the influence of fiber dispersion on the system,we uses dispersion compensation fiber to improve the system performance in the optical domain.The simulation shows that the effective transmission distance of the system is increased about 20 km than before.However,it is not suitable for promotion because the dispersion compensating fiber is expensive.Therefore,an improved channel estimation correlation algorithm is proposed for the system in the electrical domain.The simulation shows that the effective transmission distance of the system is increased about 10 km by using it.In this thesis,we also proposes a technology by using DFT spread spectrum OFDM/OQAM signal to improve systemperformance.It can solves the problem of high peak-to-average power ratio in OFDM/OQAM signal.The simulation shows that the peak-to-average power ratio of the system is improved by nearly 2dB.This part of the thesis also provides reference for the 5G bearing network. |
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