水声OTFS通信系统的研究现状、挑战与趋势OA北大核心

Underwater acoustic communication serves as a core technology for ocean information transmission,with widespread applications in ocean exploration,maritime supervision,and underwater engineering.However,the underwater acoustic channel presents significant challenges due to its doubly dispersive characteristics,posing major obstacles to system design.Although orthogonal frequency division multiplexing(OFDM)technology has been widely used in underwater acoustic communication,its performance is still limited by the accuracy of channel state estimation.Orthogonal time frequency space(OTFS)modulation technology,by transforming data for transmission in the delay-Doppler domain,can effectively address multipath effects and Doppler shifts in underwater acoustic channels,thereby enhancing the performance and reliability of communication systems.The authors review the key processing techniques of OTFS in underwater acoustic communication,covering three core aspects:channel estimation,channel equalization,and multiple access technologies.And they discusse the future development trends in terms of antenna expansion,machine learning integration,and synchronization innovation.At the same time,they analyze in detail the technical challenges faced in signal detection in complex channel environments,balancing computational complexity and real-time performance,accuracy of parameter estimation,and the impact of underwater environments on data reliability.