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
- 윤종락
- 발행연도
- 2014
- 저작권
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초록· 키워드
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UWA (Underwater acoustic) communication is essential technology for seabed mineral resource exploration, harbor defense and underwater unmanned undersea vehicle control and so on. It is highlighted future industrial technology bringing national interest.
Acoustic wave is only means of information transfer in the underwater. However, UWA communication performance is affected by time varying environmental factors of channel such as doppler effect, ambient noise, transmitted loss and multipath and so on. In underwater environment, QPSK (Quadrature Phase Shift Keying) method is generally adopted to improve the data rate. Also, OFDM (Orthogonal Frequency Division Multiplexing) method is suggested for high-speed data transmission in frequency selective channel. In particular COFDM (Coded OFDM) with FEC (Forward Error Correction) is applied to solve degradation in frequency selective multipath channel.
In this study, performance of QPSK and QPSK with FEC code is evaluated in water tank and performance of OFDM and COFDM for high underwater data transmission is also evaluated. It is found that COFDM shows 8 times more in data rate than QPSK under same SNR (Signal to Noise Ratio), COFDM is also effective to decrease BER (Bit Error Rate) in frequency selective deep fading channel even if channel bandwidth is less than sub-channel bandwidth of OFDM.
Acoustic wave is only means of information transfer in the underwater. However, UWA communication performance is affected by time varying environmental factors of channel such as doppler effect, ambient noise, transmitted loss and multipath and so on. In underwater environment, QPSK (Quadrature Phase Shift Keying) method is generally adopted to improve the data rate. Also, OFDM (Orthogonal Frequency Division Multiplexing) method is suggested for high-speed data transmission in frequency selective channel. In particular COFDM (Coded OFDM) with FEC (Forward Error Correction) is applied to solve degradation in frequency selective multipath channel.
In this study, performance of QPSK and QPSK with FEC code is evaluated in water tank and performance of OFDM and COFDM for high underwater data transmission is also evaluated. It is found that COFDM shows 8 times more in data rate than QPSK under same SNR (Signal to Noise Ratio), COFDM is also effective to decrease BER (Bit Error Rate) in frequency selective deep fading channel even if channel bandwidth is less than sub-channel bandwidth of OFDM.
목차
AbstractⅠ. 서론 1Ⅱ. 수중 음향 채널의 환경 요인과 고속 전송 기법 42.1. 수증 음향 채널의 환경 요인 42.2. 수중 다중경로 채널 82.3. 수중 음향 통신 채널에서 고속 정보전송 기법 152.4. Convolutional Code 202.5. 수중 고속 정보전송을 위한 OFDM 기법 25Ⅲ. 실험 방법 및 결과 303.1. 채널 부호화 기법이 적용된 QPSK의 성능 비교 303.2. 수중 고속 정보전송을 위한 OFDM과 COFDM 38Ⅳ. 결론 46참 고 문 헌 47
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