Wireless Sensor Network Design Based On Zigbee

With the quick growth of the wireless network technology, there are more and more existent network services trending to adopt wireless network technology. The popularization of IEEE 802.11 Wireless LAN and IEEE 802.16 Wireless Broadband Network, all make the wireless network technology become more and more important futhur more, there are many relative technologies and products appeared. Following Bluetooth's rise and development, Wireless Personal Area Network (WAPN) also became popular. Therefore, one application of WPAN一Wireless Sensor Network, begins to be discussed widely.IEEE802.15.4 is a new promoting wireless protocol, which defines the standard for wireless low-rate personal area network. It provides the definition for physical layer (PHY) and medium access layer (MAC). Upon the PHY and MAC, there constructs Zigbee protocol providing application function interface for the applicationlayer.Zigbee wireless sensor network combines sensor technology, communication technology and computer technology together. It has the ability of collecting, transferring and processing data. Sensor network technology was firstly used in military systems. But now, it has been used in almost all of the fields with the development of sensor network technology. A kind of network constructed by using PIC18F4620 controller and CC2420 transceiver shows a good performance in low power consumption and stability and is assumed well qualified to undertake some small tasks. The sensor network will be improved in the future aiming at the enhancement in data processing and communication areas.The ZigBee performance of co-channel anti-interference is investigated. The coexistence problem of ZigBee with some interferences in the 2.4GHz ISM (Industry, Science, Medicine) frequency band is analyzed. By analyzing ZigBee mechanism of anti-interference, such as channel algorithm, and by considering the condition of Wi-Fi,Bluetooth, the following conclusion is reached: the proper choice of channel, larger frequency offset and a proper distance from a interfering source are the three effectivestrategies for further improving coexistence performance of ZigBee.