MIMO Radar Privacy Protection Through Gradient Enforcement in Shared Spectrum Scenarios

Abstract

Spectrum sharing between radar and cellular communication systems has been proposed by spectrum regulatory agencies for achieving more efficient use of spectrum. Enabling such sharing requires strategies that control the interference between the two systems. A cooperative approach for spectrum sharing between a MIMO radar and a MIMO communication system has been recently proposed, in which, cooperation is supervised by a controller, who collects information from both system and designs a precoding scheme for the communication system so that it interferes minimally with the radar. However, the precoding matrix contains implicit information about the radar, and could be used by an adversary to violate the radar’s privacy. In this paper, we show how the radar angle with respect to the communication unit can be estimated based on the precoding matrix. We also propose a precoder design approach considering the trade off between the interference power and radar privacy. The proposed approach obfuscates the radar location at the cost of a slight increase in the interference power to the radar.