The Design And Implementation Of Multi-Mode Wireless Communication Terminals’ Key Technologies

Today is the age of digital communication rapid development, the demand of personalized and intelligent communication is more and more big, however, different wireless communication technology have different advantages and disadvantages and they have large institutional differences. Meanwhile the existing communication terminal function is relatively single, cannot satisfy the higher and higher communication requirements from numerous professional fields of communication. So multimode communications which integrate the advantages of various strategic communications are the inevitable trend of the development of multimode communications. This paper analyzed the multimode communication needs, and proposed a scheme of realization of multimode wireless communications terminal. The terminal integrates five modules which are3G, Beidou, satellite communications, ADS-B and digital radio, and can be used a number of services. This design ensured the communication, positioning of high reliability, realized the intelligent integration of design requirements.In this paper, based on multi-mode terminal design and implementation process, I select a number of key technologies, including architecture, performance and improvement program for a more in-depth study shows, mainly including four parts:1. Extensible architecture design.The paper introduced concise and efficient running processes of the project which ignored the differences between the communication module control, combined with a number of excellent design pattern, to achieve a variety of work and the smooth switching module. Any more,the paper put forward the hierarchical software design thinking which could reduce the coupling between the system function and bulid a scalable and modular software model.2. Performance improvement design points. Based on several key factors influencing the system performance, including thread management,IO treatment, garbage collection, network analysis and cache handling part, we made several optimized design to achieve the efficiency and reliability of the operation of the software.3. Application model improvement program.In this paper,I combined with the actual project requirements and improved the existing application function and implementation method.By custom protocol and conflict processing algorithms to achieve a fast digital radio network and dynamic network.In real-time monitoring using short message of Beidou to enhance the system-wide applications.Designed a variety of mode selection, through the preparation of the corresponding message to complete the module smooth handoff,so the multimode communication realized the automatic and intelligent.4. Joint positioning implementation and analysis.We did the relevant theoretical research of the combination of GPS and Beidou positioning algorithm theory.Through Beidou and GPS positioning we reduced the interference,and enhanced the reliability.Through the practical test shows that this paper gives the research plan of reasonable, efficient and reliable running, reached the design target.