Capacity of Wireless Ad Hoc Networks

نویسنده

  • Chris T. K. Ng
چکیده

Wireless ad hoc networks have become an important area of research in wireless communications systems. Unlike some existing networking technologies such as Internet Protocol (IP) networks or cellular systems, wireless ad hoc networks have the advantage that deployment of networks does not require preexisting infrastructures. Ad hoc networks have neither fixed topology nor centralized servers; it is assumed that, once deployed, the network nodes would self-configure to provide connectivity and form a communications network. While the tremendous flexibility of wireless ad hoc networks is a highly desirable attribute, nevertheless it also presents considerable technical challenges in analyzing the behavior of such systems. In particular, studying the capacity of wireless ad hoc networks has been a key area of investigation in the research community. For a network of n nodes, in the most general case, since each node can communicate with any other nodes, the capacity region has dimensions n(n−1). Within the field of multiple-user information theory, considering finding the capacity of general broadcast, interference, or relay channels are still open problems, computing an n(n − 1) ad hoc network capacity region is obviously an immensely complex problem. Therefore, instead of aiming to fully characterize the multidimensional capacity region, some studies focus on investigating how the network’s throughput (for a given traffic pattern) scales as the number of nodes n becomes large. In this summary, the analysis techniques and results of two such studies are presented, with the first one focusing on point-to-point transmission models (multiple user channels such as broadcast channels or multiple access channels are

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تاریخ انتشار 2004