Hybrid Semantic-Shannon Communications
Nikos G. Evgenidis, Nikos A. Mitsiou, Sotiris A. Tegos, Panagiotis D., Diamantoulakis, Panagiotis Sarigiannidis, Ioannis Krikidis, and George K., Karagiannidis

TL;DR
This paper introduces a novel multi-carrier hybrid semantic-Shannon communication system that optimizes transmission delay through joint semantic-bit transmission and power allocation, enhancing efficiency and robustness in wireless networks.
Contribution
It is the first to propose a hybrid semantic-Shannon system with optimized sentence-to-subcarrier association and delay minimization, addressing limitations of pure semantic communication.
Findings
Hybrid scheme reduces transmission delays significantly.
Optimal sentence-to-subcarrier association improves performance.
Numerical results confirm the effectiveness of the proposed methods.
Abstract
Semantic communications are considered a promising beyond-Shannon/bit paradigm to reduce network traffic and increase reliability, thus making wireless networks more energy efficient, robust, and sustainable. However, the performance is limited by the efficiency of the semantic transceivers, i.e., the achievable "similarity" between the transmitted and received signals. Under strict similarity conditions, semantic transmission may not be applicable and bit communication is mandatory. In this paper, for the first time in the literature, we propose a multi-carrier Hybrid Semantic-Shannon communication system where, without loss of generality, the case of text transmission is investigated. To this end, a joint semantic-bit transmission selection and power allocation optimization problem is formulated, aiming to minimize two transmission delay metrics widely used in the literature, subject…
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