Based Si4432 Wireless Ad Hoc Networks Design

With the rapid development of network technology, people’s demand for wireless network and ad hoc network has been more and more urgent. In order to be able to communicate in the areas without fixed base station,technology in wireless ad hoc network appears.Location of self organizing nodes in a network and transmission range determine the topology of the network,which has a significant impact on the performance of network.At present, communication radius in wireless ad hoc network node is small, the network topology is complex, data transmission is not stable. The topological structure is so intensive that the connectivity of the network is reduced,the probability of collisions will increase when a plurality of nodes share wireless channel. For this reason, the wireless ad hoc network based on Si4432 has been designed, it is a simple, low cost wireless communication network, the network is easy to install, data transmission is reliable,protocol is simple and flexible of the.Si4432 wireless ad hoc network has the following characteristics: can be based on unicast or broadcast operation, each wireless node has a unique address, the only time slot, avoid message collision when multiple nodes simultaneously send message to the center, using CSMA/CA algorithm, can detect energy.Wireless ad hoc network technology occupies an important position in the wireless data transmission, wireless data transmission is the key. Wireless ad hoc network Si4432 based on low power consumption, with the main control STM8 chip,can fast, reliable transmission of data, far transmission distance, stable performance,low power consumption, higher price advantage. The master and slave nodes from the network, from sensor nodes to automatic recognition, networking, transmission process to find the optimal path; through multi-stage transmission distance can be greater than 10 km. By identifying the mechanism of Si4432 on the preamble synchronization word, address recognition applied between modules, ensure that the data transmission between modules in the formulation, can increase the number and the stability of the whole network node. Network technology can be used for remote control in wireless self, many fields of wireless meter reading system, and has broad application prospects.