지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 조기환
- 발행연도
- 2015
- 저작권
- 전북대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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With expanding of WLAN infrastructure, many researches are recently paid attention on the indoor localization method based on WiFi channel response. Existing works are made use of the signal strength measure, RSSI(Received Signal Strength Indication), to estimate the distance based on the signal propagation attenuation model. However, it is not proper in the indoor environment because RF signals are propagated in different paths with multiple reflections in the complicated indoor environment. This multipath feature bring about an irregular attenuation of signal strength.
This thesis deals with a novel method to identify LoS(Line-of-Sight) signal with utilizing multipath propagation feature of wireless channel. CSI(Channel Status Indication) rather than RSSI is used for the channel response measure. With its time domain representation, we conducted a comparison between the main features of LoS propagation environments and that of NLoS propagation environments. In the NLoS propagation environment, while the strength of the signal transmitted to the LoS path is reduced, that of multipath signal is not significantly affected. By considering of the changes of multipath signal, LoS environment can be differentiated from NLoS one. With experimental evaluations, the proposed method shows about 90% true positive rate for identification LoS signal, 30% false positive rate.
The proposed method is expected to be usefully utilized as a good basis for estimating much accurate distance in the indoor situation. Nevertheless, it is required to further refine the comparative signal features.
This thesis deals with a novel method to identify LoS(Line-of-Sight) signal with utilizing multipath propagation feature of wireless channel. CSI(Channel Status Indication) rather than RSSI is used for the channel response measure. With its time domain representation, we conducted a comparison between the main features of LoS propagation environments and that of NLoS propagation environments. In the NLoS propagation environment, while the strength of the signal transmitted to the LoS path is reduced, that of multipath signal is not significantly affected. By considering of the changes of multipath signal, LoS environment can be differentiated from NLoS one. With experimental evaluations, the proposed method shows about 90% true positive rate for identification LoS signal, 30% false positive rate.
The proposed method is expected to be usefully utilized as a good basis for estimating much accurate distance in the indoor situation. Nevertheless, it is required to further refine the comparative signal features.
목차
제1장 서론 1제1장1절 연구배경 및 목적 1제1장2절 연구내용 2제2장 관련연구 5제2장1절 RF 특성 5제2장2절 기존 LoS 신호 식별 기법 7제3장 LoS 신호의 특징 추출 10제3장1절 전파환경에 따른 RF 특성 변화 10제3장2절 특징 추출 19제4장 LoS 신호 탐지 21제4장1절 신호세기 정규화 21제4장2절 LoS 신호 식별 방법 25제4장2절 실험 및 평가 27제5장 결론 29
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