Underwater visible light communication sensing integrated waveform design based on OTFS-LFM

Underwater visible light communication (UVLC) systems have gained a lot of attention due to the growing need for underwater communication. At present, the concept of communication and sensing integration has emerged, especially the UVLC systems’ development has become a new research hotspot. Orthogonal time-frequency space (OTFS) technology has garnered significant attention due to its exceptional performance in high-Doppler and high-delay channels, thereby providing robust communication support for the system. At the same time, linear frequency modulation (LFM) technology is widely used in the field of wireless communication due to its low sensitivity to Doppler frequency shift. In this paper, an UVLC perception integration system is designed by combining OTFS technology with LFM technology. Through experimental simulation comparison, the system performs well in bit error rate (BER), ambiguity function, target speed and distance information acquisition. The system, which combines OTFS technology and LFM technology, exhibits excellent adaptability in complex underwater environments, bringing new possibilities to the field of underwater communication. At the same time, three common modulation methods are also considered, and the possible effects of different modulations on system performance are further analyzed, offering useful insights for system optimization.