Design Of 4G Communication System Based On Embedded Linux

In today's society,the rapid development of intelligent network information has led to the development of Internet of things and artificial intelligence technology,which makes the embedded Linux technology and 4G mobile communication technology more widely and deeply applied.The Linux system has the advantages of free and open source code,reusable development,powerful kernel function and smaller volume.Based on the integration of many advantages of the previous generation,4G mobile communication technology has a better transmission speed,stronger security security and more flexible communication mode.However,how to properly combine Linux embedded devices with 4G mobile communication network to build a new network communication environment with high speed,stability and security has become a hot research field in the related field of technology.Based on the development project of spectrum monitoring system which is hosted by the laboratory,we have studied and implemented the key technologies of Linux 4G wireless network card on the development platform of embedded Linux operation system.At the beginning of this paper,the development of embedded Linux system at home and abroad and the application and development of 4G communication technology are introduced.Then,it analyzes the Linux kernel and the five subsystems of the Linux kernel.By understanding the working principle and relationship of the kernel subsystem,the USB driver in the kernel and the code of the network part are paving for the later analysis and writing of the kernel of the kernel.Then the USB protocol is analyzed and analyzed.The communication protocol and the composition structure of the USB bus are emphatically analyzed,so that the working principle of USB and the important elements of the USB driver are deeply understood.After that,the USB serial driver and the wireless network card driver involved in the module are written in combination with the specific 4G wireless network card module used.The detection and disconnection function and the receiving and sending function of the USB network part are expounded and analyzed.After compiling and loading the kernel on the development machine,the minicom super terminal debug tool is used to perform simple functional testing on the 4G module under the development machine platform.Then we begin to build the hardware and software platform needed,mainly to complete the transplant of the Linux system to the ARM development board of Xun Wei i TOP-Exynos 4412,which is used by the project.It involves the construction of the cross compilation environment,the porting of the U-Boot boot program,the kernel of the Linux system,and the construction of the generation of the root file system.Finally,we carry out the test of ping web page and the overall test of the transceiver performance of multiple sets of data packets about the ZET ME3760_V2 4G module on the Xun Wei development board after the success of the transplant.Through the analysis and summary of the test results,the 4G communication system of the embedded Linux designed in this paper meets the performance requirements of the project.