Research On PBCH Fast Detection And Target Recognition Algorithms In The TD-LTE Terminal Control

With the rapid development of mobile communication technology and mobile terminal technology,Mobile Internet come into being.The mobile terminal equipment provide people a fast access to information and a variety of services.Mobile Internet brings people great convenience,but it's still facing great challenges.in terms of privacy security and privacy leaks.Therefore,studying on the terminal control method which can interfere or guarantee the specific users' communication to prevent information disclosure has important value.The purpose of this thesis is to discuss a new TD-LTE terminal control system scheme based on dumb speech,which includes the study of the PBCH rapid detection and the identification of user terminals' identity information and finally achieve the terminal control function based on identity screening.Firstly,this thesis has completed the project demonstration and design of the TD-LTE terminal control system.Based on the analysis of the advantages and disadvantages of the existing high-power noise concealment,pseudo-base station and listening control scheme,an allegation system based on dumb speech is proposed,and the workflow of the control scheme is designed in detail.Secondly,the rapid detection of PBCH in TD-LTE terminal control system is studied.In this thesis,a aliasing segment correlation algorithm is proposed,which based on the characteristics of the synchronization sequence.In addition,according to the mapping characteristics of the downlink reference signal in the PBCH channel,an antenna number detection algorithm based on the repeated reference signal is designed.These two algorithms are employed in the PBCH decoding which create a PBCH rapid detection method.Comparing with the traditional PBCH analysis process,the PBCH rapid detection method improved the PBCH decoding rate significantly.Then,based on the system information obtained from the rapid detection of PBCH,the preamble sequence is constructed and combining with the dynamic threshold preamble detection method,the packet-related preamble detection algorithm based on the root sequence is proposed According to the requirement of false alarm probability,the preamble detection algorithm proposed in this thesis is simulated in AWGN and ETU70 channel models in high and low speed environment.Comparing with the traditional time-frequency domain detection algorithm,the proposed algorithm has higher detection success rate in the case of a single user and lower complexity in the case of multi-user.In addition,the analytical method of S-TMSI and C-RNTI information needed for the control scheme is given.Finally,the improved synchronization algorithm and the antenna port number detection algorithm are tested by the software radio platform.The testing result shows that the improved aliasing segment correlation algorithm can improve the downlink synchronization rate.By combining the improved aliasing segment correlation algorithm and the new antenna port number detection algorithm,the PBCH decoding rate can be improved greatly.The improved algorithms in this thesis can analyze the cell-level system information and S-TMSI identity information correctly,the full-interference scheme can effectively block the communication of terminals,which verify the validity of the improved algorithm and the correctness of TD-LTE terminal control scheme design.