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Zhengnan Li PhD Proposal

September 19, 2023 @ 10:00 am - 11:30 am

Multi-user Communications


10:00:00 AM

ISEC 432

Committee Members:
Prof. Milica Stojanovic (Advisor)
Dr. Xiaowen Wang (Apple)
Prof. Tommaso Melodia

Extensive research has been conducted with respect to underwater acoustic communications and networking, owing to their profound importance in various applications, such as fish farming and the oil-and-gas industry. Acoustic networks involve scenarios where multiple users necessitate transmitting data to a central base station. Techniques such as time-division or code-division multiple access are commonly employed in such networks. However, these techniques entail a trade-off: each user’s transmission rate remains confined to a fraction of the overall available resources. Consequently, the endeavor to accommodate an increased number of users within the usable resources results in a diminished data rate for each user. Conversely, if the goal is to maintain a consistent per-user data rate, the acquisition of additional bandwidth becomes imperative. Yet, the feasibility of this approach is challenged by the inherent limitations of available bandwidth in underwater acoustic systems.

In this proposal, I will present preliminary findings that involve the utilization of code and space division multiple access systems in conjunction with orthogonal frequency division multiplexing (OFDM), which is a key enabler for the current and future generations of wireless systems. Additionally, the proposal delves into the prospect of establishing an underwater acoustic channel repository—an effort designed to emulate underwater acoustic channels, thereby alleviating the necessity for extensive real-world underwater experimentation. This proposal also includes several recent long-distance underwater experiments carried out in Japan, examining various ideas regarding the frequency offset compensation problem in OFDM systems. Furthermore, beyond the outcomes in underwater acoustic communication, this proposal encompasses a series of explorations involving micro electromechanical systems (MEMS) and the utilization of terahertz frequencies.


September 19, 2023
10:00 am - 11:30 am


432 ISEC
360 Huntington Ave
Boston, MA 02115 United States
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Electrical and Computer Engineering
MS/PhD Thesis Defense
MS, PhD, Faculty, Staff