无线ad hoc网络中基于最坏干扰的最大网络容量研究  

The Maximum Network Capacity Based on Worst-Case Interference in Wireless ad hoc Networks

作　　者：吴乐意[1] 马阳杨[1] 

机构地区：[1]中国科学技术大学计算机科学与技术学院

出　　处：《电子技术（上海）》2012年第8期96-98,共3页Electronic Technology

摘　　要：无线ad hoc网络中,提高网络容量的一个重要的方法是增加网络的空间复用。增加网络的空间复用主要有两种途径:减小节点的发送功率和增大节点的载波监听阈值。但是减少发送功率和增大载波监听阈值分别使得接收到的信号强度降低和累积干扰水平增高,使得接收节点处的信噪比(SINR)降低,从而导致数据传输率降低影响了网络的空间复用。文章首先建立合理的干扰模型,该模型能够检测到所有的隐藏终端。并结合香农定理,建立了网络空间复用同节点发送功率和载波监听阈值的数学模型。当传输距离为200m,路径衰减指数为3时,发送功率/载波监听阈值=1.7×108,网络的容量达到最大。In Wireless ad hoc networks, an important measure to improve network capacity is to increase the spatial multiplexing of the network. There are two approaches to increase the level of spatial multiplexing by either reducing the transmitted power of the node or increasing the carrier sensing threshold of the node. However, as the transmit power decreases or the carrier sensing threshold increases, the SINR decreases as a result of the received signal lowered or the interference level increased, leading to the data rate decreasing and the spatial multiplexing affected. This paper builds up a reasonable interference model first, which is able to detect all the hidden terminals, then combining with Shannon theorem, builds up a network spatial multiplexing mathematical model with respect to the node transmitting power and carrier sensing threshold. When the transmission distance and the path loss index are set to 200m and 3, respectively, the transmit power/carrier sensing threshold =1.7× 108, and the network capacity can achieve maximum.

关 键 词：无线AD HOC网络 载波监听 信噪比 

分 类 号：TN929.5[电子电信—通信与信息系统]