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      Impact of Very Shallow Underwater Channel on Performance of MFSK System

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      https://www.riss.kr/link?id=T13929448

      • 저자
      • 발행사항

        부산 : 부경대학교 대학원, 2015

      • 학위논문사항

        학위논문(석사) -- 부경대학교 대학원 , 정보통신공학과 , 2015. 8

      • 발행연도

        2015

      • 작성언어

        영어

      • KDC

        569 판사항(5)

      • 발행국(도시)

        부산

      • 기타서명

        극 천해 채널이 MFSK 시스템의 성능에 미치는 영향

      • 형태사항

        48 p : 삽화 ; 26 cm.

      • 일반주기명

        지도교수:Jong-Rak Yoon
        참고문헌 수록

      • 소장기관
        • 국립부경대학교 도서관 소장기관정보
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      다국어 초록 (Multilingual Abstract)

      The shallow water underwater acoustic channel can be expressed as a frequency selective fast fading channel due to multipath, sea surface roughness, propagation medium and so on change with time and space. In addition the nature of fading varies as communication frequency change for a given channel environment. Therefore the nature of fading changes with time, space, and frequency. The receiving signal amplitude varies with range from transmitter to receiver and therefore fading statistics also changes. Inherent factor of this fading change is a constructive or destructive interference. In this study, multipath, temporal coherence and fading statistics are analyzed using linear frequency modulation (LFM) and pseudo noise (PN) signals. Based on these results, the performance of non-coherent M-ary frequency-shift-keying (MFSK) system is examined and found that the underwater acoustic channel fading depends strongly on carrier frequency and transmitter to receiver range if there are strong coherent multipath and scattering.
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      The shallow water underwater acoustic channel can be expressed as a frequency selective fast fading channel due to multipath, sea surface roughness, propagation medium and so on change with time and space. In addition the nature of fading varies as co...

      The shallow water underwater acoustic channel can be expressed as a frequency selective fast fading channel due to multipath, sea surface roughness, propagation medium and so on change with time and space. In addition the nature of fading varies as communication frequency change for a given channel environment. Therefore the nature of fading changes with time, space, and frequency. The receiving signal amplitude varies with range from transmitter to receiver and therefore fading statistics also changes. Inherent factor of this fading change is a constructive or destructive interference. In this study, multipath, temporal coherence and fading statistics are analyzed using linear frequency modulation (LFM) and pseudo noise (PN) signals. Based on these results, the performance of non-coherent M-ary frequency-shift-keying (MFSK) system is examined and found that the underwater acoustic channel fading depends strongly on carrier frequency and transmitter to receiver range if there are strong coherent multipath and scattering.

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      목차 (Table of Contents)

      • Chapter 1 Introduction 1
      • Chapter 2 Underwater Acoustic Channel 5
      • 2.1 Attenuation and Noise 5
      • 2.1.1 Spreading loss 5
      • 2.1.2 Absorption loss 6
      • Chapter 1 Introduction 1
      • Chapter 2 Underwater Acoustic Channel 5
      • 2.1 Attenuation and Noise 5
      • 2.1.1 Spreading loss 5
      • 2.1.2 Absorption loss 6
      • 2.1.3 Scattering loss 7
      • 2.1.4 Ambient noise 8
      • 2.2 Multipath 8
      • 2.3 Doppler Effect 10
      • 2.4 Time variability 11
      • Chapter 3 Underwater Acoustic System, channel model and characterization 13
      • 3.1 MFSK modulation system 13
      • 3.2 Underwater acoustic channel model and characterization 14
      • Chapter 4 Experimental procedure 19
      • Chapter 5 Results and discussion 26
      • Chapter 6 Conclusions 45
      • References 47
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