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Waveform Design with Constellation Extension for OFDM Dual-Functional Radar-Communications

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posted on 2022-11-28, 20:21 authored by Ebubekir MemisogluEbubekir Memisoglu, Talha Yılmaz, Hüseyin Arslan

Orthogonal frequency division multiplexing (OFDM) is widely used and works efficiently for the communication, but emerging applications requires OFDM to be flexible to meet sensing requirements. The time-frequency waveform design of OFDM for dual-functional radar-communications (DFRC) is critical to achieve the future communication and sensing requirements. Therefore, we propose a novel method to minimize Cram\'{e}r-Rao bounds (CRBs) of the delay and Doppler estimation to improve radar performance of an OFDM DFRC system. Although some methods are proposed in the literature to improve the CRBs, these methods either require feedforward signaling or subcarrier reservation. However, it is possible to exploit the constellation extension of quadrature amplitude modulation (QAM)  to achieve lower CRBs without these requirements. Therefore, the proposed method provides a transparent communication along with the CRB minimization for conventional OFDM systems. For the evaluation of the proposed method, CRB and symbol error rate (SER) are considered in the simulation results. Furthermore, the theoretical SER  analysis of the proposed method is derived to understand the effects of CRB minimization on the communication performance.


The work of H. Arslan was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant 120C142.


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Submitting Author's Institution

Department of Electrical and Electronics Engineering, Istanbul Medipol University, Istanbul, Turkey

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  • Turkey