Research On Synchronization Technology In Millimeter Wave High Speed Communication

The use of available communication resources currently in the low-frequency band has already reached its limit state.In addition,the communication resources used for commercial activities and available to users are extremely limited,and in the future,a variety of data services will be available.With the rich and diverse data service business increasing day by day,requires wireless communication systems to have faster information transmission rates for data services and a high-quality communication service experience.Increasing the system transmission bandwidth or increasing the spectrum utilization rate are both effective and important solutions to improve the data transmission rate of the communication system.With the increasing number of communication users today,the use of some frequencies in the low-frequency bands has already reached its limit;whether it is the use of a variety of multiple access technologies or signal modulation methods to expand the capacity of wireless communication systems,it has long been unable to meet future communications.Develop demand for higher,faster,and more stable communication service indicators.Given that the millimeter wave has a large number of abundant frequency band resources and can support high data transmission rates,it has attracted much attention in various communication fields around the world.However,compared with low-band signals,signals in the millimeter-wave band will suffer from severe Doppler shift and Doppler effect when experiencing high movement;excessive Doppler will cause the channel to have fast Time-varying characteristics.This paper focuses on the impact of the high-speed movement rate of the SC-FDE system on the use of millimeter-wave system communication services.By analyzing the relationship between the coherence time of the fast time-varying channel and the optimal transmission data length of the millimeter-wave wireless communication system under high-speed mobile scenarios.Based on the data frame structure under the 802.11 ad standard,this paper proposes an improved data frame structure,which can be applied to a high-speed millimeter-wave system.Then the research on frame synchronization technology and carrier frequency offset compensation technology are studied.The specific research process of this article is as follows:This article first briefly introduces the millimeter wave propagation characteristics,the maximum Doppler frequency offset caused by different high-speed moving speeds on millimeter-wave signals;introduces several of the most market-friendly millimeter-wave signals for high-speed mobile scenarios;and focuses on the analysis and introduction several fast time-varying channel modeling methods,and then perform fast time-varying channel modeling and simulation.Secondly,introducing the relationship between channel correlation time and moving speed of fast time-varying channels,and calculating the optimal length of data symbols that can be propagated within the coherent time of the channel.Under the 802.11 ad standard,the paper proposes an improved data frame structure,which is suitable for the millimeter-wave communication system with high mobile characteristics is proposed.By simulating,the paper analyzes the effects of most Doppler frequency shifts on the communication performance of the system.Finally,the paper introduces and analyzes several classic frame synchronization algorithms and carrier synchronization algorithms.Based on these classic algorithms,proposing a frame synchronization algorithm and Doppler compensation scheme suitable for the millimeter-wave communication system in this research scenario.The superiority of the algorithm used is simulated.