研究目的
To provide an overview of time-reversal (TR) communications in both shallow and deep water, including recent advances such as bidirectional equalization, multiuser communications with mobile users, and communication with a glider serving as a mobile gateway.
研究成果
The paper concludes that TR communications have evolved significantly over the last decade, offering an alternative to conventional multichannel equalization. TR exploits spatial diversity for spatial and temporal focusing, applicable to complex ocean environments. The block-based TR-DFE has been successfully demonstrated in various conditions, achieving high spectral efficiency. The paper emphasizes the need for further research in coupling oceanography, acoustics, and communications for reliable operation in dynamic ocean environments.
研究不足
The paper notes that active TR is expensive and difficult to implement due to the requirement for transducers that can both receive and transmit signals, and the challenge of maintaining channel stationarity between reception and retransmission. Passive TR, while more practical, still faces challenges in rapidly time-varying channels.
