Optimal Power Allocation for Location Privacy Security in Wireless Localization

The prevalence of location-based services has made positional information indispensable to everyday life, which has sparked growing concerns about the security of location privacy. In this paper, we propose to protect location privacy in wireless lo-calization from the perspective of power allocation. A closed-form expression of location secrecy metric (LSM) is first established to quantify the degree of risk that the location can be inferred by the eavesdropper. Then, a transmit power optimization problem constrained by the LSM lower bound is formulated. Through problem transformation and fractional programming, the optimal power allocation is ultimately obtained. Simulation results show that compared with the other existing strategies, the proposed power allocation strategy can effectively protect location privacy at the cost of smaller nosltioning accuracy loss.