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: Throughput Analysis of Fading Sensor Networks with Regular and Random Topologies | EURASIP Journal on Wireless Communications and Networking 2005 4 554-564 2005 X. Liu and M. Haenggi Throughput Analysis of Fading Sensor Networks with Regular and Random Topologies Xiaowen Liu Department of Electrical Engineering University of Notre Dame Notre Dame IN 46556 USA Email xliu4@ Martin Haenggi Department of Electrical Engineering University of Notre Dame Notre Dame IN 46556 USA Email mhaenggi@ Received 30 November 2004 Revised 5 June 2005 We present closed-form expressions of the average link throughput for sensor networks with a slotted ALOHA MAC protocol in Rayleigh fading channels. We compare networks with three regular topologies in terms of throughput transmit efficiency and transport capacity. In particular for square lattice networks we present a sensitivity analysis of the maximum throughput and the optimum transmit probability with respect to the signal-to-interference ratio threshold. For random networks with nodes distributed according to a two-dimensional Poisson point process the average throughput is analytically characterized and numerically evaluated. It turns out that although regular networks have an only slightly higher average link throughput than random networks for the same link distance regular topologies have a significant benefit when the end-to-end throughput in multihop connections is considered. Keywords and phrases throughput Rayleigh fading slotted ALOHA network topology interference. 1. INTRODUCTION A sensor network 1 consists of a large number of sensor nodes which are placed inside or near a phenomenon. Uniformly random or Poisson distributions are widely accepted models for the location of the nodes in wireless sensor networks if nodes are deployed in large quantities and there is little control over where they are dropped. A typical scenario is a deployment from an airplane for battlefield monitoring. On the other hand depending on the application it may also be possible to place sensors in a regular .
