| With the acceleration of social informatization, mobile networking has become a trend. Wireless network adapter is a necessary element for terminals to access the mobile network. Based on the analysis of technical features of CDMA2000 1x terminal system, according to the practical application of engineering, the thesis presents a scheme of designing a hardware system of CDMA2000 lx-based wireless network adapter with 800M USB interface.The hardware system mainly consists of baseband signal processing unit, RF signal processing unit, power management unit, and USB interface circuit, etc. With MSM6025 (dual-core processor) as the core processing chip, the digital signal processing function of cellular mobile phones is realized. RF processing unit, based on the RFR6122 receiver chip and RFT6122 transmitter chip, is used to realize the entire system signal reception and launching function integrated with the external circuit. Power management unit based on the PM6610 chip, is used for power supply and management. ARM processor can assign addresses, handle interrupts and control various other units. In this thesis, based on the research on the constitution and work principle of CDMA2000 lx-based wireless terminal hardware, schematic design of the system motherboard is completed, with its PCB drawn out and made, the entire motherboard hardware architecture built, and finally the system debugged and some problems analyzed and solved.The CDMA2000 lx-based wireless USB network adapter hardware system designed and developed is characterized by its low cost, light and handy, reliable performance and high performance price ratio. |
