Researches And Realization Of CDMA Repeater In Wireless Frequency Choice System

With the rapid development of mobile communication, every kind of wireless communication will produce the weak signal areas and blind areas in its coverage areas, it will be a high cost to set up a analog or digital Base Station, The infrastructure is also more complicated, it is quite necessary to provide a Repeater which has the advantage of low-cost and easy-building, meanwhile it has the function of minitype Base Station. This dissertation has done some researches on CDMA Repeater in wireless frequency choice system, in order to obtain the goal of enlarging the coverage areas of wireless network and optimizing network with low cost.The first part of this dissertation introduced the development of technology about mobile communication and technology about Software Define Radio. It has analyzed the structure and working principle of Repeater, described the important effects and main functions that Repeater is taking on in wireless communication system.The designing principle of CDMA Repeater in wireless frequency choice system is discussed in the second part of my dissertation. It analyzed band-pass sample theorem firstly and based on which, it has confirmed the sample frequency of the system by integrating with the requirement of Repeater design. It has done some research on the signal processing with multiple- sample rate and the realization of Single Side Band modulation, and confirmed the Filter designing scheme of the system.According to the technical regulation of CDMA Repeater in wireless frequency choice system, it has analyzed the framework of the system, studied and accomplished the hardware design,including the chips selection and the schematic drawing of the A/D module,FPGA module,D/A module,MCU module and communication interface module.In the final part, it has studied the management module of CDMA Repeater in wireless frequency choice system,including MCU(Micro Controller Unit) management module and PC management module, which fulfilled the communication function and configuration parameter function of the system by MCU. Capability of the module is key to the flexibleness and maintainability of the system.