Integrating Secure Communications into Frequency Hopping MIMO Radar with Improved Data Rates

Dual‐function radar‐communication (DFRC) based on frequency hopping (FH) multiple‐input and multiple‐output (MIMO) radar can achieve symbol rates much higher than the radar pulse repetition frequency. Such DFRC, however, is prone to eavesdropping due to the spatially widespread of an FH‐MIMO radar signal. This chapter reveals the potential of using permutations of hopping frequencies to achieve both secure and high data rate FH‐MIMO DFRC. It highlights the angle‐dependent issue in detecting permutations and develops an elementwise phase compensation to solve the issue for a legitimate user (Bob). Elementwise phase compensation makes the demodulation at an eavesdropper conditioned on knowing the angle‐of‐departure of Bob. The chapter also presents the random sign reversal technique which randomly selects several antennas over hops and reverses their signs.