배열센서를 이용한 천해 수중음향 채널 입사각 파워 추정

Abstract

In the design of broadband underwater acoustic communication system, proper analysis of underwater acoustic channel characteristics is required to determine communication system parameters. Especially for spatial processing such as diversity combining and multi-input multi-output (MIMO) systems, spatial correlation characteristics determine the communication performance and they are affected by the angular power distribution of the incoming acoustic waves. In this study, we implement the space alternating generalized expectation maximization (SAGE) algorithm for channel parameter estimation and apply it to the experimental data gathered from a very shallow water of 20 to 30 meters water depth near the southern coast of South Korea.

As a result of it, we show the variation of the multipath channel characteristics over different transmitter-receiver ranges and then estimate the angular power profiles from the complex amplitudes of impinging waves.

Finally, we discuss the impact of the angular power profile on the spatial correlation characteristics between different receiver array elements.