tailieunhanh - Báo cáo hóa học: " Research Article On the Throughput Capacity of Large Wireless Ad Hoc Networks Confined to a Region of Fixed Area"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article On the Throughput Capacity of Large Wireless Ad Hoc Networks Confined to a Region of Fixed Area | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 83487 11 pages doi 2007 83487 Research Article On the Throughput Capacity of Large Wireless Ad Hoc Networks Confined to a Region of Fixed Area Eugene Perevalov 1 Rick S. Blum 2 and Danny Safi2 1 Department of Industrial and Systems Engineering Lehigh University Bethlehem PA 18015 USA 2 Department of Electrical and Computer Engineering Lehigh University Bethlehem PA 18015 USA Received 22 June 2007 Revised 23 September 2007 Accepted 21 October 2007 Recommended by Ivan Stojmenovic We study the throughput capacity of large ad hoc networks confined to a square region of fixed area thus exploring the dependence of the achievable throughput on the spatial node density. We find that there exists the value of the node density the critical density depending on the ratio of the total noise power to the transmit power such that the throughput increases as n a-1 2 at first reaches a maximum and then decreases as n-1 2. Copyright 2007 Eugene Perevalov et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Wireless networks consist of a number of nodes which communicate with each other using high-frequency radio waves. Some of these networks have a wired backbone or infrastructure with only the last hop being wireless. Cellular phones and wireless networks using WI-FI are examples of this. Ad hoc networks are another type of wireless networks. They are formed by a collection of nodes without the aid of any fixed infrastructure. Since there are no base stations to route data through the data needs to be routed to the destination by using the nodes in a multihop fashion. The problem of throughput capacity of ad hoc wireless networks has received a lot of attention starting with the