시·공간 변동 수중음향 채널에서 CAZAC 코드를 적용한 반송파 주파수 옵셋 보상 기법의 성능평가 = Performance of Carrier Frequency Offset Compensation using CAZAC Code in Time and Spatial Variant Underwater Acoustic Channel

다국어 초록 (Multilingual Abstract)

In underwater acoustic multipath channel, a performance of underwater acoustic (UWA) communication systems is affected by dynamic variation of boundary and high temporal and spatial variability of the channel conditions. Time and spatial variations of UWA channel induce a carrier frequency offset (CFO) since a phase and a frequency of received signal mismatch with a transmitting signal. Therefore, a performance of a phase shift keying underwater acoustic communication system is degraded. In this study, we have analyzed a performance of CFO estimation and compensation using a phase code in time and spatial variation channel. A constant amplitude zero autocorrelation (CAZAC) signal is applied as a phase code signal and its performance is evaluated in water tank. The bit error rate of a quadrature phase shift keying (QPSK) system with a phase code is improved about 4 to 10 times better than that without a phase code.