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배열 안테나를 사용한 디지털 비디오 방송용 OFDM 수신기의 성능평가
전제훈,노현민,변건식 東亞大學校附設 情報技術硏究所 2004 情報技術硏究所論文誌 Vol.12 No.1
Orthogonal frequency division multiplexing(OFDM) is becoming the chosen modulation technique for wire and wireless communications with fast data rate because of good spectral effciency and sufficient robustness of fading channel. Digital Video Broadcating is using OFDM to modulate. But Digital Video Broadcating has performance degradation in moving reception according to DOA(Direction of Arrival). The purpose of this paper is to improve reception performance using array antenna in environment with doppler effect.
혼합방식을 사용한 OFDM의 PAR 경감방식의 성능 해석
장은영,전제훈,김성곤,변건식 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.10 No.2
OFDM should be used for the fourth generation communication for high speed communication. Because of high spectral efficiency and high tolerance to fading channel, OFDM is applied to many high speed wire and wireless communication such as DAB(Digital Audio Broadcast), DVB(Digita1 Video Broadcast), IMT 2000 etc. Inter-modulation, however, is derived from PAR(Peak to Average Power Ratio) of OFDM signals. The paper describes PTS(Partia1 Transmit Sequence) and SLM(Se1ect Mapping) of an existing methods which can reduce PAR. And then this papers proposed the new method that is called "Combine method". The method proposed in this paper is to combine PTS and SLM. As a result of the simulation, Combine PAR method is better than the existing methods.
초광대역 시간 호핑 PPM UWB 통신 시스템의 성능 평가
이민혁,전제훈,이성신,변건식 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.11 No.1
Ultra-wideband(UWB) communication applications is a recent innovation due to high transmission rate and low power emission. Therefore, it is important to research UWB singal's characteristics and modulation methods to apply to various UWB communication technologies. In this paper the characteristics of Gaussian monopulse which is capable of using UWB communication was analyzed and we compared the performance of PPM and PAM modulation method. Also we simulated the interference effect of QPSK system with different center frequencies in the present of various UWB noises and simply modeled UWB system.