7. Extended Techniques

In this chapter, two extended cross-modal communication techniques are presented. On the one hand, cross-modal communication technology has been deeply integrated with semantic communications, which has attracted widespread attention in recent years, forming a new communication paradigm called cross-modal semantic communications. This new communication paradigm fully explores the semantics both within each modality (intra-modal semantics) and among modalities (inter-modal semantics), and combines them organically. It can effectively solve the polysemy and ambiguity issues existing in current semantic communications and ensure the stability of semantic transmissions. On the other hand, in extremely low communication and computing resource scenarios such as underwater equipment troubleshooting, agricultural operations in remote mountainous areas, and emergency rescue missions responding to natural disasters, existing regular cross-modal communication techniques often fail, and the associated algorithms need to be re-designed. This chapter takes the cross-modal haptic signal recovery in an emergency rescue scenario as an example to illustrate the encountered challenges and available solutions in this direction.