Range-Angle Dependent Beampattern Synthesis With Null Depth Control for Joint Radar-Communication

In this letter, we present an analytical method to design a range-angle-dependent beampattern using frequency diverse array (FDA) with null depth control (NDC) for joint radar and communication applications. A slow time-dependent nonuniform frequency offset is used to lock the phase of transmitted signal at a specific time instant to achieve the objective. Moreover, we introduce range-angle-dependent NDC for the joint radar and communication functionalities. That is, we design two transmit beamspace matrices for the subaperturing FDA to generate a similar main lobe toward the target for radar functionality but distinct null depth levels for communication purpose, so that the transmitted information can be efficiently detected by the intended communication receiver. The performance of the proposed design is evaluated using the bit error rate for communication and using the signal-to-interference-plus-noise ratio for radar.