A dual-function radar-communication system using FDA

To alleviate the spectrum congestion crisis, we design a dual-function radar-communication (DFRC) with frequency diverse array multiple-input multiple-output (FDA-MIMO) radar. A set of orthogonal waveforms are used to implement the primary radar operation, and we propose an information embedding scheme for the secondary communication function, which is carried out by embedding the information into the frequency increments of FDA-MIMO radar as part of phase of the transmit steering vector. The communication receiver detects the phase of the received signal and uses it to decode the embedded binary sequence. The probability of error is analyzed in terms of the bit error rate (BER). In addition, the Cramer-Rao bounds (CRBs) for angle and range respectively are derived to examine the effect of information embedding in radar emission on the performance lower bounds of the FDA-MIMO radar. Simulation examples are provided to demonstrate the effectiveness of the proposed information embedding technique.