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실내 무선 센서 네트워크에서 위치 기반 라우팅을 위한 위치에러 감지 프로토콜
공영배(Youngbae Kong),박귀태(Gwitae Park) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.5
In wireless sensor networks (WSNs), geographic routing algorithms can enhance the network capacity. However, in the real WSNs, it is difficult for each node to know its accurate physical location. Geographic routing with location error may have serious problems such as disconnected links and delayed data transmission. In this letter, we present an efficient location error detection scheme for geographic routing. The proposed algorithm can efficiently update its incorrect location without additional procedure and finally enhance the performance on the geographic routing with the location errors.
Robust localization over obstructed interferences for inbuilding wireless applications
Youngbae Kong,Younggoo Kwon,Gwitae Park IEEE 2009 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.55 No.1
<P>Location-awareness can be applied to the various consumer applications. A received signal strength (RSS) based localization system is relatively inexpensive and simple to be implemented without additional hardware supports. However, the radio signals are strongly affected by the obstructed interferences. This is a difficult problem for the RSS based localization systems to be implemented in real world. To solve this problem, we propose a practical and robust localization algorithm in the obstructed environments. The proposed algorithm uses the Maximum Likelihood Estimation (MLE) based on the position probability grid. In addition, the proposed algorithm detects and compensates the large measurement error using the Min-Max algorithm. We evaluated the performance of the proposed algorithm in the obstructed environments. Performance results show that the proposed algorithm outperforms other algorithms on the obstructed environments.</P>