Investigation On Multi-carrier IF Processing And Implementation Of Some Key Parts

Software Radio attracts peoples' attention because of its characteristic, it enables people process different communication system by different software in an uniform hardware platform. The purpose of this dissertation is to investigate on some methods of multi-carrier IF Processing and implement some modules based on the idea of Software Radio.In the field of aeronautics and astronautics, people use different communication systems, which causes different types of signals to be separated in different sub-frequent bands (sub carriers) of a broad channel. In each sub-frequent band, signals can be modulated by different modulation methods and people can also use different multiple access methods. So a kind of communication system is required, which can receive all the sub-frequent band signals rapidly and correctly.CDMA (Code Division Multiple Access) technology is used in communication system abroad because of its merit, people use CDMA technology to transmit data, image and also other different information in different sub-frequent bands of a broad channel. So a research, which combines multi-carrier signal processing and CDMA technology and processes different sub-frequent bands signal at same time, is full of practicable value.First, this dissertation introduces the basic theory of software radio, its characteristic and its key technology. Then studies a peculiar multi-carrier direct sequence spread spectrum (MC-DS-CDMA) technology, analyzes the methods of processing multi-carrier signals and study the mathematical module of multi-carrier communication system receiver. This dissertation proposes to adopt poly-phase filtering channelized receiver to receive the special multi-carrier DS-CDMA signal, which is studied by this dissertation, and use digital matched filter to de-spread signal. Finally, according to the goal of whole system, this dissertation realizes some key modules and display the corresponding figures.