Dr. Aijun Song: Underwater Communications & Research

Beyond the Surface: Dr. Aijun Song and the Frontier of Underwater Wireless Communications

While humanity has mapped the surface of Mars and built sprawling global satellite networks that connect billions of people through the air, our own planet’s vast aquatic ecosystems remain largely shrouded in digital darkness. Radio frequency (RF) waves—the invisible backbone of terrestrial Wi-Fi and cellular networks—attenuate rapidly in water, making standard wireless communication virtually useless beneath the surface.

Pioneering a way through this technological barrier is Dr. Aijun Song, an Associate Professor of Electrical and Computer Engineering at The University of Alabama. Dr. Song’s research is fundamentally changing how scientists, engineers, and autonomous machines communicate, navigate, and monitor Earth’s rivers, lakes, and oceans.

Academic Foundations and Trajectory

Dr. Song’s journey into advanced signal processing and communications began with a solid foundational education. He earned his Bachelor of Science and Master of Science degrees in Electrical and Computer Engineering from Xidian University in Xi’an, China. Driven by a passion for complex system engineering, he moved to the United States to pursue doctoral studies at the University of Delaware, where he received his Ph.D. in Electrical and Computer Engineering in 2005.

Before joining the faculty at The University of Alabama, Dr. Song spent nearly a decade at the University of Delaware as a postdoctoral researcher and research professor, refining his expertise in dynamic systems, signal identification, and underwater network architecture. In 2015, he transitioned to the University of Alabama, where he expanded his research laboratory and deepened his focus on the Internet of Underwater Things (IoUT).

Pioneering Underwater Acoustic Communications and Reconfigurable Surfaces

Water is notoriously hostile to traditional data transmission. Sound waves (acoustics) travel much better through water than electromagnetic waves, but underwater acoustic channels are plagued by low bandwidth, long propagation delays, multi-path reflections, and severe noise fluctuations caused by surface waves and marine activity.

Dr. Song’s work addresses these hurdles head-on. His major contributions span several core areas:

• Underwater Acoustic Reconfigurable Intelligent Surfaces (UA-RIS): Dr. Song and his collaborators have been at the forefront of designing and testing UA-RIS technology. By utilizing advanced elements—such as multilayered piezoelectric reflectors that implement in-phase and quadrature (IQ) modulation—his team enables precise passive beam steering. This technology helps extend the range and speed of underwater communications while minimizing acoustic noise pollution that could otherwise disrupt marine life.
• Dynamic MAC Protocols and Network Infrastructure: Traditional media access control (MAC) protocols fail in aquatic environments due to the sluggish speed of sound in water. Dr. Song’s research designs protocols that dynamically optimize power and channel utilization, significantly lengthening the operational battery life of underwater autonomous vehicles (UAVs).
• National Science Foundation (NSF) Recognition: In recognition of his foundational contributions to underwater wireless communication architecture, Dr. Song received the prestigious NSF CAREER Award in 2021, alongside collaborative grants aimed at creating robust communication infrastructure for underwater robotics.

Bridging Research, Education, and Community Outreach

Beyond his academic publications and laboratory innovations, Dr. Song is deeply committed to public outreach and nurturing the next generation of scientists.

His team frequently brings classroom theories into the real world, conducting high-profile field demonstrations of underwater robotics networks in local aquatic environments like Lake Tuscaloosa and the Black Warrior River. These deployments have served educational programs such as the U.S. Geological Survey (USGS) FLOW Academy, showing students firsthand how autonomous systems monitor water quality and aquatic health.

Furthermore, Dr. Song has made a profound impact on his local community by launching and coordinating the Tuscaloosa chapter of MATHCOUNTS, a national middle school mathematics competition program. By fostering early enthusiasm for mathematical problem-solving, he helps build the critical framework upon which future engineering innovations rely.

Looking Ahead

As industries increasingly look toward the “blue economy”—spanning offshore renewable energy, marine archaeology, environmental conservation, and disaster prevention—reliable underwater connectivity is more crucial than ever. Through his relentless pursuit of smarter acoustic systems and robust network protocols, Dr. Aijun Song is helping humanity bridge the digital divide between land and sea, turning Earth’s hidden depths into an interconnected frontier.