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A novel dual-function radar communication (DFRC) system is proposed, thatachieves high target resolution and high communication rate. It consists of amultiple-input multiple-output (MIMO) radar, where only a small number ofantennas are active in each channel use. The probing waveforms are orthogonalfrequency division multiplexing (OFDM) type. The OFDM carriers are divided intotwo groups, one that is used by the active antennas in a shared fashion, andanother one, where each subcarrier is assigned to an active antenna in anexclusive fashion (private subcarriers). Target estimation is carried out basedon the received and transmitted symbols. The system communicates informationvia the transmitted OFDM data symbols and the pattern of active antennas in ageneralized spatial modulation (GSM) fashion. A multi-antenna communicationreceiver can identify the indices of active antennas via sparse signal recoverymethods. The use of shared subcarriers enables high communication rate. Theprivate subcarriers are used to synthesize a virtual array for high angularresolution, and also for improved estimation on the active antenna indices. TheOFDM waveforms allow the communication receiver to easily mitigate the effectof frequency selective fading, while the use of a sparse array at thetransmitter reduces the hardware cost of the system. The radar performance ofthe proposed DFRC system is evaluated via simulations, and bit error rate (BER)results for the communication system are provided.

A Joint Design of MIMO-OFDM Dual-Function Radar Communication System Using Generalized Spatial Modulation