Abstract
본 논문에서는 단일 반송파 기반의 디지털 변조 기법들의 성능을 수중 통신 실험을 통하여 분석하였다. 통신 실험은 실제 해상에서 수행되었으며 적용된 변조기법은 위상 비동기 방식인 ASK, FSK와 위상 동기 방식의 QPSK이다. 통신 성능을 평가하기 위해 이미지 파일을 600bps~3Kbps의 전송률을 가지는 신호로 변조하여 전송하였다. 수신된 신호를 복조하여 BER을 추정한 결과 ASK와 FSK의 경우 보상 알고리즘 없이 <TEX>$10^{-3}{\sim}10^{-4}$</TEX>의 오차율을 나타내었고, QPSK의 경우 선형 등화기를 이용하여 <TEX>$10^{-4}$</TEX>의 오차율을 가지는 통신이 가능함을 확인하였다. In this paper, underwater acoustic communication experiment was carried out to test a performance of single carrier digital modulation schemes. The communication experiment was performed at real sea and tested modulation schemes are ASK, FSK with non-coherent detection and QPSK with coherent detection. A modulated image data was transmitted with data rates of 600bps~3Kbps. From the results of BER of the demodulated signal, ASK and FSK show the achievable BER of <TEX>$10^{-3}{\sim}10^{-4}$</TEX> without compensation techniques and QPSK show that of <TEX>$10^{-4}$</TEX> with linear equalizer.
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