Research Of Self-organized Network Based On SDR

Self-organized network is used in many mobile communication fields for the fast development of mobile communication and mobile terminal technology.Wireless sensor network as a special self-organized network and an advanced subject internationally, is used in industry monitoring systems widely. Nowadays, coal mine accidents are happening with increasing frequency, the security problems of coal mine production are paid more and more attention, the existing monitoring systems of coal mine are all connected by industry bus, which lead to worse anti-interference and very high hardware cost.When the wire network is destroyed, the wire monitoring system will not work normally, and do nothing for rescue. Combining SDR technology with self-organized network, such as wireless sensor network, could solve the problems which could not be solved by the wire monitoring system.A design method of ZigBee wireless sensor network is proposed in this paper on the basis of wireless sensor network firstly, the limitation of sensor nodes and energy consumption problems of MAC protocol are analyzed; then according to the feature that MAC layer can save energy, three kinds of MAC protocol which can save energy by contention mode are researched, meantime their feature and suitable position are analyzed by NS2,ZigBee MAC protocol which is used in this paper is paid more attention; finally a method of ZigBee wireless sensor network under coal mine by comparing the existing coal mine monitoring system is proposed,the influence of the environment under coal mine for the wireless communication is analyzed; for the demand of wireless network topology structure for saving energy, the energy consumption problems of node for ZigBee MAC protocol within different topology structure is researched briefly, an improving method based on beacon-enabled mode for saving energy better is suggested.