Coverage Estimation of Cognitive Radio in TV White Space

MasterThis thesis presents a simulation model to calculate coverage of TV band devices (TVBDs) in TV white space (TVWS), considering the presence of interference by Digital TV (DTV). Recently, the Federal Communications Commission (FCC) proceedings have considered the notion of unlicensed device operation in the television broadcast bands due to the lack of bandwidth at the low frequency spectrum. In January 2010, the IEEE established a new standard task group to develop a standard for 802.11 WLANs operating in the TV white space (TVWS). This approval brings the ever increasing interest in cognitive radio techniques. The performance loss of DTV has concerned in the previous works for TVWS since incumbent services must be protected from interference by TVBDs. Compared to the previous works, this thesis concentrates on the performance of the secondary system such as TVBD. Based on the standard of IEEE 802.11 af, this thesis have considered the realistic simulation environments and developed the software for TVBD. For the accurate estimation of the achievable data rate, additional features should be in the simulation. The co-channel or adjacent interferences aroused from DTV signal are also taken into account with pass loss models. The packet error rate (PER) of TVBD of each modulation and coding scheme (MCS) is estimated and combined with the link budget analysis. This thesis estimate the TVBD service coverage for different ranges of TVBD transmit antenna height by using a large scale fading channel model and the proposed scheme. The estimation of TVBD service coverage applies the keep-out distance specified in the Federal Communication Commission (FCC) rule. Simulation results based on both methods show that the TVBD service coverage located outside the DTV protected contour is reduced due to neighboring DTV service and the reducing trend about the large scale fading channel is similar to that of the proposed scheme. These results demonstrate that the proposed scheme can be used to estimate the service coverage of TVBD networks with low complexity and contribute to determine regulatory policies

Content Aware Image Restoration to Improve Throughput of Dual-channel Oblique Plane Microscopy for Slide-free Histology

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TV화이트 스페이스에서 인식 라디오 네트워크의 전송 범위 추정을 위한 간섭 모델

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소형무인이동체 탐지를 위한 레이다 시스템 설계 및 탐지 성능 검증

전 세계적으로 드론 및 소형 무인 항공기(UAVs) 시장 규모가 급격히 증가하였다. 무인 항공기 제조 관련 기술 발전 및 저렴한 개발 비용으로 인하여 군사 목적뿐만 아니라 특히, 민간용으로도 활용 범위가 증대되는 추세인데, 이러한 드론 및 UAV는 배달 서비스에서 방송, 안전검사, 레져 사업 등 기타 다양한 산업 분야에 크게 활용 되고 있다. 향후 인간의 삶의 측면에서 더욱 다양한 분야로의 확장 가능성 및 잠재성이 있지만, 한편으로는 테러리즘, 실수 또는 고의적 사생활 침해, 공공기관의 보안위협 같은 많은 위험요소를 안고 있다. 본 논문에서는 이러한 위협에 대한 조치로써 소형 드론 탐지에 활용 가능한 Chirp pulse 레이다 시스템을 소개하고 이러한 시스템을 이용하여 드론 탐지능력을 검증하였다

A method for singularity avoidance in continuous path control

학위논문(석사) - 한국과학기술원 : 전기 및 전자공학과, 1987.2, [ [ii], 106 p. ]한국과학기술원 : 전기 및 전자공학과