【作者】 赵晨；

【导师】 何波；

【作者基本信息】 中国海洋大学 ， 通信与信息系统， 2007， 硕士

【摘要】 随着无线网络技术的快速发展,许多本来存在的网络服务逐渐走向成熟。近几年来,IEEE 802.11无线局域网络的普遍以及IEEE 802.16无线宽带网络的商业标准化都使得无线网络技术越来越重要,也有越来越多的相关应用和产品出现。目前,基于IEEE 802.15.4协议的无线传感器网络,开始成为被广泛讨论和研究的课题之一。IEEE802.15.4是一个新兴的无线通信协议,它确定了低速个人区域网络标准,定义了物理层PHY和介质访问层MAC。Zigbee协议在PHY和MAC层的基础上对网络层NWK进行了具体定义,为应用层提供API函数。Zigbee无线传感器网络将传感器技术、通讯技术和计算机技术结合在一起,具有信息采集、传输和处理的能力。传感器网络最初是由于军事需要而发展起来的,随着传感器网络技术的逐步发展,它的应用也越来越广泛,现在己从军事防御普及到社会的各个领域。本课题通过采用PIC18F4620单片机和无线收发模块CC2420搭建了一个传感器网络。试验和应用结果表明,这种传感器网络成本低,工作稳定,可以用于一些小型任务中。为了进一步提高节点的处理能力和通信能力,未来还将做进一步改进。针对ZigBee技术本身的抗同频干扰性能进行了研究,分析了在2.4GHz频段ZigBee和主要干扰源的共存问题,通过分析ZigBee的信道算法等抗干扰机制并结合Wi-Fi、蓝牙等技术的特点,得出结论:正确选择信道、增大频偏以及和干扰源保持一定距离是保证共存的三个主要措施。更多还原

【Abstract】 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.更多还原