The Design And Implementation Of Physical Layer Specifications In Mobile Communications Protocol On PXI Platform

This project is finished under the entrustment of National Institute of Metrology, with the purpose of perfecting and improving the digital mobile communications metrological standards. By integrating the resources and building new standards, the project and the existing metrological standards can constitute a new generation of standard equipments in mobile communications.In this project, we develop a set of mobile communication systems using LabVIEW virtual instruments based on PXI hardware platform, including 2G(GSM and IS-95) and 3G(TD-SCDMA, WCDMA and CDMA2000). We build signal generator and vector signal analyzer for every 2G and 3G mobile communications specifications. The generator and analyzer can form a communications system on the NI PXI hardware platform, or communicate with other equipments from outside, by download the software to the PXI cards.The thesis begins with the introduction of basic theory in software defined radio, then explains some key technologies and the main structures in the area.The technological development part of the thesis includes the construction of hardware and the software design of the physical layer specifications. In hardware we introduced and explained the performance of PXI engine case, controller and all the PXI cards of various capabilities. We also explained how they are connected; The software part includes the introduction of 2G and 3G physical layer specifications and the development of the communications system based on the specifications. In the end the test scheme is presented, the test data is collected and presented in the spreadsheet, and the system performances are assessed.The system meets the needs of mobile communications metrological standards in its high preciseness. It is enabled with the functions that traditional instrument has, and without the disadvantages: it is highly modularized, programmable and portable. More costs are cut and the workloads of tests and calibrations are eased. This system works not only as a complement to the existing mobile communications standards, but also an open interface and platform for the following researches and application services improvements.