DFRC的复合信令：是否专用探测信号？
Composite Signalling for DFRC: Dedicated Probing Signal or Not?
摘要：
双功能雷达通信（DFRC）是在无线网络中同时探测雷达目标和传输信息的一种新的解决方案。本文研究了DFRC系统的发射和接收波束联合优化问题。具体地说，在通信用户（CU）的信干噪比（SINR）约束条件下，雷达的信干噪比（SINR）最大化，体现了雷达与通信之间的最优折衷。除了简单地使用通信信号进行目标探测之外，我们还考虑利用专用探测信号来增强雷达感知性能。我们开始通过研究单CU的情况下，其中提供了一个封闭的形式的波束成形设计问题的解决方案。然后证明了不需要专用的雷达探测信号。作为进一步的步骤，我们考虑一个更复杂的多CU的情况下，其中的波束成形设计制定为一个非凸二次约束二次规划。最优解是通过应用半定松弛保证秩-1性质得到的。结果表明，在多CU的情况下，应采用专用探测信号，以提高雷达的性能，在CU实现额外的干扰消除的成本。最后通过数值仿真验证了该算法的有效性。
英文摘要：
Dual-functional radar-communication (DFRC) is a promising new solution to simultaneously probe the radar target and transmit information in wireless networks. In this paper, we study the joint optimization of transmit and receive beamforming for the DFRC system. Specifically, the signal to interference plus noise ratio (SINR) of the radar is maximized under the SINR constraints of the communication user (CU), which characterizes the optimal tradeoff between radar and communication. In addition to simply using the communication signal for target probing, we further consider to exploit dedicated probing signals to enhance the radar sensing performance. We commence by studying the single-CU scenario, where a closed-form solution to the beamforming design problem is provided. It is then proved that a dedicated radar probing signal is not needed. As a further step, we consider a more complicated multi-CU scenario, where the beamforming design is formulated as a non-convex quadratically constrained quadratic programming. The optimal solutions are obtained by applying semidefinite relaxation with guaranteed rank-1 property. It is shown that under the multi-CU scenario, the dedicated probing signal should be employed to improve the radar performance at the cost of implementing an additional interference cancellation at the CU. Finally, the numerical simulations are provided to verify the effectiveness of the proposed algorithm.
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