Research And Implementation Of TD-LTE Random Access Algorithm For Broadband Wireless Trunking Communication System

As a private wireless communication network,trunking communication system which has the characteristics of the greater deployment flexibility,call establishment and security than other mobile communication systems,is mainly used to meet the communication needs such as unified command and production scheduling in outdoor operations.It has been widely applied to aviation communication,traffic transportation,public safety and many other areas of private communications.With the rapid development of wireless high-speed services,trunking mobile communication system's demand for broadband multimedia business are increasing,making the development of a new generation of digital broadband trunking communication system becomes inevitable.In the public network communication system,LTE communication standards,with its high-speed,high efficiency,low latency and other significant advantages,has been commercial and mature for several years.Therefore,LTE should be a great choice for broadband wireless trunking system's evolution technology.Furthermore,research on TD-LTE trunking communication system is of special significance to the development of China's private network.In this context,this thesis relies on TD-LTE broadband wireless private network of National Science and Technology Major Project,studying random access technology in the TD-LTE trunking system.Firstly,based on the key technology of TD-LTE uplink physical layer,this thesis introduces the uplink synchronization technology and analyzes the design of physical random access channel in standard protocol in detail.Secondly,for the reception and detection algorithm of the physical preamble signal in the TD-LTE trunking system,the performance of format 4 is simulated and analyzed under the AWGN channel and the ETU 70 channel,which are compared with the basic requirements in the 3GPP TS 36.104 specification.Then,according to the basic detection principle of the former,considering the trunking communication under air to ground circumstance,a number of suggestions are given for the improvement of the physical frame structure and the detection algorithm based on the access design of the format 3,and corresponding comparison in the simulation is completed to prove the effectiveness of the improved program.Finally,based on the Virtex-6 FPGA chip,this thesis completes the logic design and function simulation of each FPGA implementation module of the preamble detection algorithm,and builds TD-LTE trunking system on the MicroTCA platform,which verifies feasibility of the algorithm.