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In this paper, we aim to achieve energy efficient design with minimumhardware requirement for hybrid precoding, which enables a large number ofantennas with minimal number of RF chains, and sub-arrayed multiple-inputmultiple-output (MIMO) radar based joint radar-communication (JRC) systems. Adynamic active RF chain selection mechanism is implemented in the basebandprocessing and the energy efficiency (EE) maximization problem is solved usingfractional programming to obtain the optimal number of RF chains at the currentchannel state. Subsequently hybrid precoders are computed employing asub-arrayed MIMO structure for EE maximization with weighted formulation of thecommunication and radar metrics, and the solution is based on alternatingminimization. The simulation results show that the proposed method with minimumhardware achieves the best EE while maintaining the rate performance, and anefficient trade-off between sensing and communication.

Hardware Efficient Joint Radar-Communications with Hybrid Precoding and RF Chain Optimization