Positioning Scheme Based on Iterative Path-Loss Exponent Estimation in WSNs

Abstract

In wireless sensor networks, the positioning scheme using received signal strength (RSS) has been widely considered. Appropriate estimation of path-loss exponent (PLE) between a sensor node and an anchor node plays a key role in reducing position error in this RSS-based positioning scheme. In the conventional researches, a sensor node directly uses the PLEs measured by its nearest anchor node to calculate its position. However, the actual PLE between a sensor node and the anchor node can be different from the PLE measured by its nearest anchor node. Thus, if a sensor node directly uses the PLEs measured by its nearest anchor node, the estimated position is different from the actual position of the sensor node with a high probability. In this paper, we describe the method how a sensor node estimates PLEs from the anchor nodes of interest by itself and ※ 본 연구는 2011년도 정부(교육과학기술부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초사업연구임 (No.2011-0021152).주저자：인하대학교 정보통신공학과 멀티미디어 통신망 연구실,