Research And Implementation Of Channel Equalization Based On The OAI Platform

Based on the design of the grouping system,LTE system is a seamless integrated communication system with flexible bandwidth and low access latency.Compared with other technology,LTE system contains less network elements,but with high speed,high performance,high system capacity and coverage.Channel fading caused by multipath propagation and signal time-varying characteristics is an important issue which affects communication quality and user experience,so the channel equalization is one of the important technology of protocol stack research,which greatly affects wireless communication system.This dissertation focuses on channel equalization technology.Firstly,in order to research channel equalization technology objectively,this dissertation constructs a high efficiency,strong experimental communication platform.Based on OAI software and C-RAN hardware structures,this platform realizes complete communication process,efficient and scientific analog network communication.This platform can be adapted to a variety of complex multipath channel and can also provide reference value for the development of 5G and the research of new technology.Secondly,this dissertation does related theoretical research and formula derivation about the typical channel equalization technique,which includes LS algorithm and MMSE algorithm,and then this dissertation discusses the performance,advantages.and disadvantages of these two algorithms.For comparative analysis of those two algorithms,they will be implemented in the platform based on OAI,thus providing facts and design ideas for the optimal channel equalization algorithm.Next,Based on those two typical algorithms,advanced mathematics and equilibrium theory,this dissertation puts forward MMSE algorithm,an optimal equalization algorithm applicable to the multipath fading channel.This simplified MMSE optimization algorithm reduces platform computation by using matrix inversion and combining the number of antennas used in OAI platform.This algorithm can significantly reduce the algorithm complexity,which makes the MMSE algorithm application in engineering simpler and easier,and makes no-hardware simplified algorithm possible.The simulation result shows that the improved algorithm in the OAI platform runs efficiently without increasing the time delay redundantly.This research in this dissertation may possibly provide reference value and research significance to the development and implementation of communication platform.Lastly,this dissertation summaries the research process,and puts forward the existing problems and improvement plan about the platform in next phase.