Performance Comparison of Image Transmission in Underwater Acoustic Environment

Lee, Seung-Woo

Journal of the Korea Institute of Military Science and Technology 2008;11(3):19-29.

Seung-Woo Lee

수중 음향 환경에서의 영상 전송 성능 비교분석

이승우

국방과학연구소

Abstract

Underwater acoustic(UWA) communication is one of the most difficult field in terms of severe channel environments such as multipath propagation, high temporal and spatial variability of channel conditions. Therefore, it is important to model and analyze the characteristics of underwater acoustic channel such as multipath propagation, transmission loss, reverberation, and ambient noise. In this paper, UWA communication channel is modeled with a ray tracing method and applied to image transmission. Quadrature phase shift keying(QPSK) and multichannel decision feedback equalizer(DFE) are utilized as phase-coherent modulation method and equalization technique, respectively. The objective is to improve the performance of the image transmission using vertical sensor array instead of single sensor in the viewpoint of bit error rate(BER), constellation diagram, and received image quality.

Key Words: Underwater Acoustic Communication, Adaptive Beamformer, Adaptive Equalizer, Underwater Acoustic Channel Modeling