| Shorthand for CDMA is code division multiple access,which is in spread spectrum communication technology developed on a new and mature wireless communication.CDMA technology stems from the emergence of people's demand for higher-quality wireless communication.CDMA technology is more and more within then communications industry experts believe this century one of the most important multiple access in wireless communication means.With the increasingly sophisticated communications technology,development of spread spectrum technology,with its unique advantage showed a very strong vitality.Today,especially in electronic warfare,because of its unique spread spectrum communication system anti-interference ability of concealment as well as,access to a wide range of applications in the military.This article is based on CDMA spread spectrum communication system for the study of digital intermediate frequency modules.Author on the basis of in-depth analysis on synchronization technology of several common based on capturing and tracking,is responsible for complete hardware design of digital intermediate frequency modules,as well as synchronization algorithm based on Verilog HDL language design,Modelsim simulation and on-board test. Eventually the CDMA spread spectrum communication system applied to a weapon system's command and control among the two-way voice data transmission.The main results are as follows:1. Summarized the basic concepts and technical of spread-spectrum and synchronization system.2. Analysised several common acquisition and tracking technology of synchronization.Showed the block diagram and system implementations.3. Discussed CDMA system forward link,reverse link design scheme,and synchronization schemes.4. Introduced the hardware implementation platform of digital intermediate frequency modules. 5. Introdeced the designs for RTL modules writtened by Verilog HDL language,and the Modelsim's similation results of the core modules. |
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