Efficient Joint Resource Allocation for Wireless Powered ISAC with Target Localization

arXiv (Cornell University)

Abstract

Wireless powered integrated sensing and communication (ISAC) faces a fundamental tradeoff between energy supply, communication throughput, and sensing accuracy. This paper investigates a wireless powered ISAC system with target localization requirements, where users harvest energy from wireless power transfer (WPT) and then conduct ISAC transmissions in a time-division manner. In addition to energy supply, the WPT signal also contributes to target sensing, and the localization accuracy is characterized by Cramér-Rao bound (CRB) constraints. Under this setting, we formulate a max-min throughput maximization problem by jointly allocating the WPT duration, ISAC transmission time allocation, and transmit power. Due to the nonconvexity of the resulting problem, a suitable reformulation is developed by exploiting variable substitutions and the monotonicity of logarithmic functions, based on which an efficient successive convex approximation (SCA)-based iterative algorithm is proposed. Simulation results demonstrate convergence and significant performance gains over benchmark schemes, highlighting the importance of coordinated time-power optimization in balancing sensing accuracy and communication performance in wireless powered ISAC systems.

Authors 5

1. Boyao Li Aachen INDA Institute

   RWTH Aachen University

   Affiliation as printed

   INDA Institute , RWTH Aachen University , Germany,

2. Qinwei He
   Affiliation as printed

   Global Energy Interconnection Research Institute Europe GmbH , Germany ,

3. Boao Zhang Aachen INDA Institute

   RWTH Aachen University

   Affiliation as printed

   INDA Institute , RWTH Aachen University , Germany,

4. Xiaopeng Yuan Aachen INDA Institute

   RWTH Aachen University

   Affiliation as printed

   INDA Institute , RWTH Aachen University , Germany,

5. Anke Schmeink Aachen INDA Institute

   RWTH Aachen University

   Affiliation as printed

   INDA Institute , RWTH Aachen University , Germany,