This paper proposes a multi-access and multi-user semantic communication scheme based on semantic matching and intent deviation to address the increasing demand for wireless users and data.The scheme enables flexible ...This paper proposes a multi-access and multi-user semantic communication scheme based on semantic matching and intent deviation to address the increasing demand for wireless users and data.The scheme enables flexible management of long frames,allowing each unit of bandwidth to support a higher number of users.By leveraging semantic classification,different users can independently access the network through the transmission of long concatenated sequences without modifying the existing wireless communication architecture.To overcome the potential disadvantage of incomplete semantic database matching leading to semantic intent misunderstanding,the scheme proposes using intent deviation as an advantage.This allows different receivers to interpret the same semantic information differently,enabling multiplexing where one piece of information can serve multiple users with distinct purposes.Simulation results show that at a bit error rate(BER)of 0.1,it is possible to reduce the transmission by approximately 20 semantic basic units.展开更多
The new applications surge with the rapid evolution of the mobile communications.The explosive growth of the data traffic aroused by the new applications has posed great computing pressure on the local side.It is esse...The new applications surge with the rapid evolution of the mobile communications.The explosive growth of the data traffic aroused by the new applications has posed great computing pressure on the local side.It is essential to innovate the computation offloading methods to alleviate the local computing burden and improve the offloading efficiency.Mobile edge computing(MEC)assisted by reflecting intelligent surfaces(RIS)-based unmanned aerial vehicle(UAV)is a promising method to assist the users in executing the computation tasks in proximity at low cost.In this paper,we propose an energy-efficient MEC system assisted by RIS-based UAV,where the UAV with RIS mounted relays the computation tasks to the MEC server.The energy efficiency maximization problem is formulated by jointly optimizing the UAV's trajectory,the transmission power of all users,and the phase shifts of the reflecting elements placed on the UAV.Considering that the optimization problem is non-convex,we propose a deep deterministic policy gradient(DDPG)-based algorithm.By combining the DDPG algorithm with the energy efficiency maximization problem,the optimization problem can be resolved.Finally,the numerical results are illustrated to show the performance of the system and the superiority compared with the benchmark schemes.展开更多
基金This work was supported in part by the National Natural Science Foundation of China(62201034).
文摘This paper proposes a multi-access and multi-user semantic communication scheme based on semantic matching and intent deviation to address the increasing demand for wireless users and data.The scheme enables flexible management of long frames,allowing each unit of bandwidth to support a higher number of users.By leveraging semantic classification,different users can independently access the network through the transmission of long concatenated sequences without modifying the existing wireless communication architecture.To overcome the potential disadvantage of incomplete semantic database matching leading to semantic intent misunderstanding,the scheme proposes using intent deviation as an advantage.This allows different receivers to interpret the same semantic information differently,enabling multiplexing where one piece of information can serve multiple users with distinct purposes.Simulation results show that at a bit error rate(BER)of 0.1,it is possible to reduce the transmission by approximately 20 semantic basic units.
基金supported by National Key Research and Development Program of China(2021YFB2900801)supported by Guangdong Basic and Applied Basic Research Foundation(2022A1515110335)+2 种基金supported by Fundamental Research Funds for the Central Universities(FRF-TP-22-094A1)supported by Science,Technology and Innovation Project of Xiongan New Area(2022XAGG0114)supported by Meteorological information and Signal Processing Key Laboratory of Sichuan Higher Education Institutes of Chengdu University of Information Technology(CXHCL202201).
文摘The new applications surge with the rapid evolution of the mobile communications.The explosive growth of the data traffic aroused by the new applications has posed great computing pressure on the local side.It is essential to innovate the computation offloading methods to alleviate the local computing burden and improve the offloading efficiency.Mobile edge computing(MEC)assisted by reflecting intelligent surfaces(RIS)-based unmanned aerial vehicle(UAV)is a promising method to assist the users in executing the computation tasks in proximity at low cost.In this paper,we propose an energy-efficient MEC system assisted by RIS-based UAV,where the UAV with RIS mounted relays the computation tasks to the MEC server.The energy efficiency maximization problem is formulated by jointly optimizing the UAV's trajectory,the transmission power of all users,and the phase shifts of the reflecting elements placed on the UAV.Considering that the optimization problem is non-convex,we propose a deep deterministic policy gradient(DDPG)-based algorithm.By combining the DDPG algorithm with the energy efficiency maximization problem,the optimization problem can be resolved.Finally,the numerical results are illustrated to show the performance of the system and the superiority compared with the benchmark schemes.
