Research On Network-building Realization Of Common Frequency Broadcasting System

"Common Frequency Broadcasting System"(Abbr. CFB system) is a new way to build communication network recently, which can improve communication coverage area effectively. Building CFB system doesn't only take use of frequency resources, but be applicable for re-building existing network, thus economize the investment of network equipment. At present, manufacturers like MOTOROLA, TAIT has developed relevant products which don't have practicability in domestic market due to its high price. Few domestic companies also have analogous products, but each of them is different and expensive. Therefore, researching on realization technology of CFB system has important meaning.Firstly, this thesis introduces basic concept of CFB system and analyze the postulates of CFB system realization. Five network link modes of CFB system are also introduced with respective advantages, disadvantages and communication process.Secondly, experiment system and its communication process are designed that build a CFB system with one primary-station and two slavery-stations by five KenWood TK-868G Transmitter-receivers. Communication protocol is also formulated.Thirdly, control circuitry schematic of experiment system is designed. Program of control unit which is ATmega16L Single-chip Machine is developed under ICCAVR and AVR Studio Integrated Development Environment (Abbr. IDE). PC application software based on Windows Operation System is also developed under Visual C++ 6.0 IDE.Finally, the whole system is debugged and makes all communication functions designed come true.