Abstract: The development history and latest research of semantic communications are summarized, and the mathematical modeling of semantic communications based on the classical Shannon information theory is explored. The joint source channel encoding model of semantic perception and the progressive performance analysis, including the rate distortion region, and the inner outside of the error probability, are introduced in detail. The close connection between the degradation of the model and the existing engineering framework is pointed out. The potential challenges and open questions of semantic communications are then discussed. It is believed that semantic communications, as a new architecture integrating user needs and information meaning into communication transmission, is expected to become a new basic paradigm of all things intelligent connection network in the future.
Keywords: wireless communication; semantic communication; Shannon information theory; joint source-channel coding; indirect source coding