Optimal Jammer Placement in Wireless Localization Systems

TL;DR

This paper investigates the optimal placement of a jammer in wireless localization systems to maximize the CRLBs for target nodes, providing theoretical conditions, explicit formulas, and numerical illustrations.

Contribution

It introduces a novel optimization framework for jammer placement, deriving explicit solutions and conditions for multiple target scenarios, advancing understanding of interference strategies.

Findings

Optimal jammer location maximizes CRLBs for targets.

Explicit formulas for jammer placement with two targets.

Jammer lies on the convex hull of targets when no constraints exist.

Abstract

In this study, the optimal jammer placement problem is proposed and analyzed for wireless localization systems. In particular, the optimal location of a jammer node is obtained by maximizing the minimum of the Cramer-Rao lower bounds (CRLBs) for a number of target nodes under location related constraints for the jammer node. For scenarios with more than two target nodes, theoretical results are derived to specify conditions under which the jammer node is located as close to a certain target node as possible, or the optimal location of the jammer node is determined by two of the target nodes. Also, explicit expressions are provided for the optimal location of the jammer node in the presence of two target nodes. In addition, in the absence of distance constraints for the jammer node, it is proved, for scenarios with more than two target nodes, that the optimal jammer location lies on the convex hull formed by the locations of the target nodes and is determined by two or three of the target nodes, which have equalized CRLBs. Numerical examples are presented to provide illustrations of the theoretical results in different scenarios.