Software Radio If Digitization Technology Research And Implementation

This dissertation analyses the system of the ideal software radio and the processing ability of digital signal processors, provides the realization of software radio system in recent years, that is, based on the commonly used hardware platform, software programmable and configurable, IF digital system, and declares the popular digital technologies in software radio which can be used in this IF digital system. Taking IF digital receiver of software radio as example, based on the FM signal receiving, the dissertation illustrates the realization of theory basis and arithmetic of IF digital in software radio, and makes a real-time simulation to the receiver model using the computer software, then gets some satisfying results. The author designs the commonly used hardware platform of IF digital receiver in software radio, and companying with the schematic circuit plot analyses the working principle of hardware system, moreover, explains the properties and usages of some important digital processors. Special function will be implemented by downloading special software into the hardware platform, and the system can be constantly upgraded by continually upgrading the software. The author programs all the software which defines all the functions of IF digital receiver taking FM receiving as example, which makes it the IF digital unit of ultrashort FM transceiver. By the means of downloading software into the IF digital hardware platform, some satisfying results have gotten and shown in this dissertation with help of circuit board and measuring devices, which fully testifies the feasibility of theory and realization of IF digital technology in software radio and the feasibility of this project as IF digital unit of ultrashort transceiver.