题 目：Underwater Acoustic Communications and Networks
报告人： Dale Green
Chief Scientist, Teledyne Benthos, USA
时间： 4月27日（周一）上午10点半
地点： 教七-302(多)
摘要：
At present, the realities of acoustic communications and undersea networks differ substantially from the expectations arising from academic theory and investigation. The issue is not that the fundamentals of communications theory do not apply, but rather the fact that the difficulties of the acoustic channel do not necessarily fit the assumptions underlying conventional applications of that theory. In this paper we describe many of the practical problems that have been addressed over the past ten years of modem development. Some of the issues addressed have an RF analog, but the severity of the channel and the combination of channel constraints and modem-platform operations makes acoustic communications a very different problem. In particular, we address these issues via their impact on physically small, battery powered, DSP-based, omni-directional modems. We describe progress toward using commercial acoustic modems as the basis for underwater networks.
Several important underwater activities can be accomplished with modem-based systems. For example, modem-based navigation aids, and modem-based sensing provide use of integrated resources for communications and data, signal, and information processing. We describe several new systems which extend our communications infrastructure to provide extended underwater capabilities.
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信电系信息与通信工程研究所
2009-4-25