This paper investigates a hybrid beamforming design for dual-function radar-communication (DFRC) systems. Comparing with fully digital beamforming, much less radio frequency (RF) chains are needed and hence, both hardware cost and energy consumption can be reduced. The hybrid transmit/receive beamformers are designed by maximizing the sum-rate under constraints of power as well as similarity between the designed beamformer and the reference one that has good beampattern property. Particularly, both single-user and multi-user scenarios are addressed by introducing different hybrid beamforming designs. For the single-user case, we devise an alternating optimization method under the alternating direction method of multipliers (ADMM) framework. For the multi-user scenario, we introduce a two-stage procedure based on weighted mean-square error minimization (WMMSE). Numerical simulations are provided to demonstrate the effectiveness of the proposed schemes.

中文翻译：

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多载波双功能雷达通信系统的混合波束成形

本文研究了双功能雷达通信 (DFRC) 系统的混合波束成形设计。与全数字波束成形相比，需要的射频 (RF) 链要少得多，因此可以降低硬件成本和能耗。混合发射/接收波束成形器是通过在功率约束以及设计的波束成形器与具有良好波束图特性的参考波束成形器之间的相似性下最大化总速率来设计的。特别是，通过引入不同的混合波束成形设计来解决单用户和多用户场景。对于单用户情况，我们在乘法器交替方向法（ADMM）框架下设计了一种交替优化方法。对于多用户场景，我们引入了一个基于加权均方误差最小化 (WMMSE) 的两阶段程序。提供了数值模拟来证明所提出方案的有效性。