无线网络中隐藏终端的干扰特性研究

Research on Interference Characteristics of Hidden Terminal in Wireless Network

中文关键词:  无线网络  隐藏终端  IEEE 802.11a  物理层建模  干扰特性

英文关键词:wireless network  hidden terminal  IEEE 802.11a  physical layer modeling  interference characteristics

中文摘要:

      无线网络中，隐藏终端对分组接收的干扰是造成网络性能下降的主要原因之一。因此，对其进行深入细致的研究具有重要意义。在仿真工具OMNeT++中，对IEEE 802.11a标准所规定的物理层变速率传输机制进行了精确的仿真建模，并在此基础上进一步研究了不同传输模式与分组冲突情况下的隐藏终端干扰特性。研究表明，隐藏终端干扰特性与传输模式、发送端和接收端之间的距离、分组冲突的重叠程度以及数据分组格式等均有较强的相关性。研究结果可以为设计网络协议，提高网络性能提供重要的参考。

英文摘要:

      The interference caused by hidden terminal is one of the key reasons that leads to network performance degradation in wireless network.Therefore,the in depth research of interference from hidden terminal is of great significance.An accurate physical layer modeling according to the multirate transmission mechanism of IEEE 802.11a in OMNeT++ is built,and a further investigation on interference characteristics of hidden terminal is made,in which the influences including different transmission modes and packet overlapping percentages are considered.It confirms that the interference characteristics of hidden terminal have strong relationship with transmission mode,the distance between transmitter and receiver,packet overlapping percentage and packet format.The research results provide an important reference for designing network protocol and improving network performance.