Dual-function FDA MIMO radar-communications system employing costas signal waveforms

Recently, the dual use of single waveform for joint radar and communications operation has gained significant attention. In this paper, we put forward frequency diverse array (FDA) multiple-input multiple-output (MIMO) radar employing Costas signal waveforms for information symbol to be embedded when radiated. We use Costas frequency codes to implement the FDA MIMO radar operation (i.e., primary function), while embedding communication symbol, for instance, phase shift keying (PSK), in each Costas frequency code for communication operation (i.e., secondary function). We utilize standard ratio testing at the communication receiver side to detect the embedded PSK symbols. Furthermore, we analyzed the symbol error rate (SER), signal-to-interference-plus-noise ratio (SINR), transmit beampattern and communication data rate. Numerical results have verified the effectiveness of the proposed system. The proposed system can also be use for low probability of interception (LPI) radar applications because it produce random-like energy distributed beampattern.