• 한국인터넷방송통신학회논문지
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• 제13권2호
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• pp.269-273
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• 2013

본 논문은 대표적인 전파응용기기로 알려진 PDP(Plasma Display Panel) TV와 RF(Radio Frequency) 전구가 30MHz 이하 무선 서비스에 대한 전자기기의 잠재적 간섭 영향을 분석한 것이다. PDP TV와 RF 전구의 방사 크기를 전자파무반사실에서 측정하였고 이를 바탕으로 다수의 간섭 신호가 존재하는 경우에 결합된 간섭신호의 크기를 계산하였다. 분석 결과, 간섭원의 수에 따라 결합된 간섭 신호의 크기가 증가되는 경향을 확인하였다. 실험을 통해 얻어진 전자기기의 방사 측정값과 CISPR(International Special Committee on Radio Interference) 11의 제한치를 비교함으로 30MHz 이하의 무선 서비스에 대한 전자기기 간섭 잠재성을 확인하였다.

• ETRI Journal
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• 제29권3호
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• pp.393-395
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• 2007

Analytic modeling and computational simulation for the protection of DTV from cognitive radio interference are performed. Protection is achieved by using the protection ratio, which is derived through system modeling and its analysis. On the frequency coordination between digital TV and cognitive radio, an analysis in a co-channel environment, in a rural area in Korea, is performed.

• 한국통신학회논문지
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• 제34권12A호
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• pp.1014-1022
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• 2009

본 논문에서는 UHF(Ultra High Frequency) 방송 대역에서 면허 사용자인 DTV(Digital Television) 서비스와 무선인지(cognitive radio, CR) 기술 기반의 모바일 와이맥스(mobile wimax) 서비스 사용자 상호 간 최적 공존 및 운용 방안 획득을 위하여 간섭분석을 수행하였다. 이를 위해 SEAMCAT(Spectrum Engineering Advanced Monte-Carlo Analysis Tool) 간섭분석 프로그램을 이용하여 방송대역에 존재하는 상기 무선통신 상호 간 최적 공존 기준 획득을 위한 모의실험을 수행하였다. 또한 간섭분석을 통하여 획득된 주변 통신환경 정보는 수신기 관점에서의 정확한 간섭 기준 취득 방안인 간섭온도 모델에 적용하였다. 이를 통해 DTV와 CR 사용자의 중심 주파수 차이에 따른 CR 사용자 수신기에서의 획득 가능 통신용량 변화를 분석하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.151-154
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• 1998

The interference evaluation methods and criteria between the analogue TV/FM signals for BSS(Broadcasting Satellite Service) plans and the associated feeder link plans were established in WARC(World Administrative Radio Conference)-77 and 88. However, it should be applied the different interference evaluation methods and criteria of the digital TV signals from those of the analogue TV/FM signals. In this paper, the interference evaluation methods and criteria between the digital TV signals and the analogue TV/FM signals were analyzed. And also, the effects of the interference from the digital signals for Koreasat-1 into the analogue TV/FM signals for Japanese broadcasting satellite were evaluated. The amounts of EIRP reduction in the transmitting space stations were calculated to meet the interference criteria. The results showed that the digital BSS networks including Koreasat-1 would share the limited resources with the analogue BSS networks.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권2호
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• pp.117-126
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• 1999

The environmental impact of the KEPCO 765-kV transmission line was studied using a full scale test line in order to develop the design technology. Therefore this paper describes an environmental design summary of the audible noise, hum noise, wind noise, radio interference, TV interference and electric field measurement from the KEPRI 765-kV double circuit transmission test line with a bundle of $6-480mm^2$ conductors per phase. The analysis of the test results shows that 6-Rail and 6-Cardinal conductors bundle satisfy the audible noise criterion & TV interference under the stable rainy weather condition and the radio interference level under the fair weather. And the other items are also agreed with the design level criterion for KEPCO 765-kV transmission line.

• Journal of electromagnetic engineering and science
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• 제14권4호
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• pp.353-359
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• 2014

Recently, the use of mobile devices has increased, and mobile traffic is growing rapidly. In order to deal with such massive traffic, cognitive radio (CR) is applied to efficiently use limited-spectrum resources. However, there can be multiple communication systems trying to access the white space (unused spectrum), and inevitable interference may occur to cause mutual performance degradation. Therefore, understanding the effects of interference in CR-based systems is crucial to meaningful operations of these systems. In this paper, we consider a long-term evolution (LTE) system using additional spectra by accessing the TV white space, where low-power devices (LPDs) are licensed primary users, in addition to TV broadcasting service providers. We model such a heterogeneous system to analyze the co-existence problem and evaluate the interference effects of LPDs on LTE user equipment (UE) throughput. We then present methods to mitigate the interference effects of LPDs by 'de-selecting' some of the UEs to effectively increase the overall sector throughput of the CR-based LTE system.

• 천문학논총
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• 제30권2호
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• pp.691-693
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• 2015

Radio sources are very weak, as they can travel through large distances. Radio sources also have photons with low energies compared to others electromagnetic waves (EM). Microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and the most energetic electromagnetic wave is gamma-rays. Radio astronomy studies are restricted due to radio frequency interference (RFI) produced by people. If this disturbance is not minimized, it poses critical problems for astrophysical studies. The purpose of this paper is to profile RFI maps in Peninsular Malaysia with a minimum mapping technique for RFI interference. Decision-making processes using GIS (Geographical Information System) for the selection requires gathering information for a variety of parameters. These factors affecting the selection process are also taken into account. In this study, various factors or parameters are involved, such as the availability of telecommunications transmission (including radio and television), rainfall, water lines and human activity. This mapping step must be followed by RFI site testing in order to identify areas of low RFI. This study will benefit radio astronomy research, especially regarding the RFI profile.

• 한국항해학회지
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• 제22권1호
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• pp.55-62
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• 1998

본 논문에서는 TV 주파수에 있어서 건조물에 의해 발생하는 전자파장해를 평가하기 위해 건축물 주위의 산란전자계를 수치계산하였다. 건축물 외벽에 전파흡수체를 부분적으로 부착한 경우 콘크리트면의 노출면적과 반사전계강도와의 관계를 조사하였다. 계산된 산란 전자계로부터 DU 비를 구해 TV 고스트방지를 위하여 건축물 외벽에 부착할 전파흡수체에 요구되는 반사 감쇠량을 구하였다.

• 한국통신학회논문지
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• 제35권4B호
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• pp.704-712
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• 2010

최근 다양한 무선기기 및 통신서비스의 보급으로 주파수 부족문제가 대두되고 있다. 이에 대한 해결책으로 신규 주파수자원 확보와 더불어 주파수 이용에 간섭 없이 기존의 TV 방송통신 대역(UHF/VHF)의 유휴주파수(Whitespace) 자원을 이용할 수 있는 무선인지(Cognitive Radio) 기술이 주목 받고 있다. 본 논문에서는 먼저 TV 대역 상에서 비면허 무선서비스의 활용 가능성을 탐색하기 위해 개발한 무선인지 단말시스템을 소개하고, 이 단말시스템 상에 탑재되어 효율적인 주파수 관리 기능을 수행하는 센싱 MAC 모듈의 개발 내용 및 테스트 결과를 기술한다. 무선인지 단말시스템에 적용된 센싱 MAC 소프트웨어는 IEEE 802.22 표준 규격을 기반으로 설계 및 구현되었으며, 개발된 센싱 MAC 모듈의 테스트를 수행하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.341-342
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• 2006

A physical model for reduction of Electromagnetic Interference(EMI) or its predecessors, Radio Noise, Electrical Noise, or Radio-Frequency-Interference(RFI), is a rapidly expanding digital technology. It covers the frequency spectrum from DC to about 3 GHz EMI is the poisoner which does not allow radio, TV, radar, navigation, and a lot of electrical, electro-mechanical, and electronic and communication devices, apparatus and systems to operate compatibly in a common frequency spectrum environment EMI can result in a jammed radio, heart pacer failures, navigation errors and many other either nuisance or catastrophic events. Therefore, it follows that this spectrum pollution problem has reached international levels of concern and must be dealt with m proportion to the safety and economic impact Involved.