Search

Your search keyword '"Qu, Shaocheng"' showing total 148 results
Start Over Author "Qu, Shaocheng"
148 results on '"Qu, Shaocheng"'

22. Joint Trajectory and Communication Design for UAV-Assisted Symbiotic Radio Networks

Author

Zhao, Li, Xu, Hongbo, Qu, Shaocheng, Wei, Ziming, and Liu, Yuanyuan

Abstract

Owing to their controlled mobility, extensive coverage and low cost, unmanned aerial vehicles (UAVs) have significant promise in the field of military, civilian and commercial applications, which has sparked a lot of research interest. This paper explores the application of the UAV in the symbiotic radio (SR) system. Specifically, we study the multi-user SR system assisted by the UAV and intelligent reflecting surface (IRS), and the modulation scheme with high flexibility is adopted to embed the IRS symbols into the UAV signals. First, we focus on minimizing the maximum bit error rate (BER) among all ground devices (GDs) while meeting the minimum communication rate requirements by jointly designing the active transmit beamforming and flight trajectory of the UAV as well as IRS reflective phase shifts. Then, we develop an iterative algorithm based on block coordinate descent (BCD) technology to address this optimization problem. Specifically, the optimization problem is decoupled into three sub-problems to be alternately solved, which are solved by invoking the semidefinite relaxation (SDR) and successive convex approximation (SCA) techniques. Moreover, the convergence performance and computational complexity of the proposed algorithm are analyzed. Finally, simulation results show the proposed algorithm can significantly improve the quality of IRS transmission.

Published
2024
Full Text
View/download PDF

50. A novel active sliding mode control for synchronization of uncertain chaotic systems

Author

Wang Yongji, Wang Xiaoyan, and Qu Shaocheng

Subjects
Lyapunov stability, Computer science, Synchronization of chaos, Chaotic, Stability (learning theory), Sliding mode control, Theoretical Computer Science, Transformation (function), Control and Systems Engineering, Control theory, Synchronization (computer science), Computer Science (miscellaneous), Engineering (miscellaneous), Social Sciences (miscellaneous)
Abstract

PurposeThe purpose of this paper is to find a practical active sliding mode control approach for synchronization of two uncertain chaotic systems.Design/methodology/approachSliding mode control approach is known to be an efficient alternative way to implement synchronization for uncertain chaotic systems. However, design of traditional sliding mode controller usually needs complex state transformation. Owing to a novel idea of virtual state feedback, a control strategy for synchronization of uncertain chaotic systems is presented, which does not need any complex state transformation. Furthermore, based on Lyapunov stability theory, a sufficient condition is drawn for the robust stability of the error dynamics of synchronization for uncertain chaotic systems.FindingsA novel active sliding mode control approach is proposed to achieve the synchronization of two uncertain chaotic systems.Research limitations/implicationsThe main limitation is that uncertainties must meet matched conditions.Practical implicationsThe paper presents a useful control approach for synchronization of two uncertain chaotic systems.Originality/valueThe proposed sliding mode control approach based on novel virtual state feedback does not need any complex state transformation, unlike the traditional sliding mode control.

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results