Underwater Communication Overview

Principles

Definition

Underwater communication is the research field concerned with the principles, methods, and challenges of transmitting and receiving information through aquatic environments. It investigates the unique physical properties of water that affect signal propagation, including significant attenuation, multipath effects, and noise, across various modalities such as acoustic, optical, and electromagnetic waves. This field is critical for enabling applications in marine science, defense, resource management, and autonomous underwater systems.

Ontological type

Core Modalities

Channel Characteristics

Applications and Use Cases

Key developments

Key Figures

Model-Driven Acoustic Telemetry era

W. A. Kuperman [1] is highlighted for the 1984–1990 model-driven acoustic telemetry era, with activity across University of California, San Diego [3] and University of Washington [4]. Kuperman [1] advanced matched field processing as a framework for source localization in correlated noise, as described in the 1988 paper Matched field processing: Source localization in correlated noise as an optimum parameter estimation problem [5], a contribution that enabled robust inverse estimation under reverberant ocean conditions. Bruce M. Howe [2] is documented across University of California, San Diego [3] and University of Washington [4] during this era. Howe [2] authored pivotal ocean acoustic tomography work on mesoscale velocity [6], high spatial resolution in vertical slice ocean acoustic tomography [7], and multiple receivers in single vertical slice ocean acoustic tomography experiments [8], advancing tomographic imaging and environmental inference in reverberant, time-varying oceans.

Cross-Layer Underwater Networking era

Milica Stojanovic [1] is associated with the Massachusetts Institute of Technology [3] and the University of Washington [4] during this era of cross-layer underwater networking. Her key contributions include providing propagation models and statistical characterizations of underwater channels [7], laying out the design principles for underwater networks [8], and addressing nonuniform Doppler shifts with multicarrier schemes [9], each crucial for enabling robust, scalable multimodal links in long-delay, highly multipath underwater environments. J.G. Proakis [2] is associated with the University of California, San Diego [5] and the University of California, Los Angeles [6] in this era. His key contributions include Phase-coherent digital communications for underwater acoustic channels [10], High-Rate Communication for Underwater Acoustic Channels Using Multiple Transmitters and Space–Time Coding: Receiver Structures and Experimental Results [11], and the foundational work on Underwater Acoustic Networks [8], all of which propelled cross-layer optimization and high-throughput strategies.

Turbulence-Resilient Optical Links era

C. L. Philip Chen [1] is a prominent researcher associated with the University of Science and Technology of China [3] and Fuzhou University [4] during the Turbulence-Resilient Optical Links era. His key contributions in this era center on outlining underwater IoT system architecture and open issues that inform integrated channel models and realistic link budgets, as demonstrated in his 2019 paper Underwater Internet of Things in Smart Ocean: System Architecture and Open Issues [7]. Jing Xu [2] is a prolific researcher affiliated with Nankai University [5] and Zhejiang University [6] during this era. Xu's contributions include advancing turbulence-resilient underwater optical links through adaptive water-air-water data information transfer using orbital angular momentum [8], pushing power-efficient long-reach underwater wireless optical communication using a multi-pixel photon counter [9], and enabling relaxed link alignment via optical combining and arrayed sensitive receivers for extended reach [10].