Minimum energy and secure transmissions on the underwater channel
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Underwater acoustic communication is rapidly becoming an important part of many future commercial, environmental, and military applications such as diver-to-diver-to-vessel communications, disaster prevention, defense and surveillance. Nevertheless, underwater acoustic signals are largely affected by path loss and time-varying multipath propagation which make reliable and secure communications difficult to achieve. Moreover, the energy constrained nature of the underwater acoustic devices imposes great limitations for applications requiring long-term and robust communication. As a result, the field of underwater communications still has many open research problems. The objective of this research work is to further extend the underwater communication technologies by developing novel and low-cost channel estimation and equalization techniques, minimizing energy consumption to maximize the lifetime of an underwater acoustic device, and reducing the likelihood of propagating signals being intercepted by an eavesdropper. The work in this dissertation is supported by extensive experimental studies in underwater acoustic devices that include commercially available SM-975 Teledyne-Benthos SMART modems and in-house built software-defined acoustic (SDA) modems.