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Though underwater acoustic (UWA) channel is the most challenging due to its time varying and frequency selective characteristics, UWA communications draw lots of attention to satisfy the increasing demand of the various applications. In this paper, for the purpose of providing high data rate and reliable services for UWA communications, slot structure as well as the pilot pattern is designed based on the UWA channel characteristics below 10 kHz. MCS level for the downlink application is also optimized by the system performance evaluation at link-level.