arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.06358cs.ITeess.SPmath.IT
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无人机使能的集成周期性感知与通信的吞吐量最大化

Throughput Maximization for UAV-enabled Integrated Periodic Sensing and Communication

Kaitao Meng, Qingqing Wu, Shaodan Ma, Wen Chen, Kunlun Wang, Jun Li

AI总结:

针对UAV使能的ISAC系统中感知与通信需求不对称的问题,提出集成周期性感知与通信机制,通过联合优化UAV轨迹、用户关联、目标感知选择和发射波束成形最大化系统可达速率,并设计基于惩罚的算法高效求解该非凸问题。

摘要:

无人机(UAV)有望彻底改变现有的集成感知与通信(ISAC)系统,并承诺提供更灵活的联合设计。然而,现有的ISAC研究主要集中在整个考虑周期内同时探索两种功能的性能,这可能忽略了实际中非对称的感知与通信需求。特别是,始终强制感知伴随通信,可能会因共享频谱资源和有限的发射功率而使得在这两种功能之间更难平衡。为解决这一问题,我们为UAV使能的ISAC系统提出了一种新的集成周期性感知与通信机制,以在两种集成功能之间提供更灵活的权衡。具体而言,通过联合优化UAV轨迹、用户关联、目标感知选择和发射波束成形,最大化系统可达速率,同时满足给定目标的感知频率和波束方向图增益要求。尽管该问题高度非凸且涉及紧密耦合的整数变量,我们推导出了闭式最优波束成形向量以大幅降低波束成形设计的复杂度,并给出了可达速率的紧下界以促进UAV轨迹设计。基于上述结果,我们提出了一种基于惩罚的算法来高效求解所考虑的问题。在无限数量天线的特殊情况下,分析了最优可达速率和最优UAV位置。此外,我们证明了在无位置约束的不同ISAC帧中最优解之间的结构对称性,并提出了一种高效算法来求解带位置约束的问题。

英文摘要:

Unmanned aerial vehicle (UAV) is expected to revolutionize the existing integrated sensing and communication (ISAC) system and promise a more flexible joint design. Nevertheless, the existing works on ISAC mainly focus on exploring the performance of both functionalities simultaneously during the entire considered period, which may ignore the practical asymmetric sensing and communication requirements. In particular, always forcing sensing along with communication may make it is harder to balance between these two functionalities due to shared spectrum resources and limited transmit power. To address this issue, we propose a new integrated periodic sensing and communication mechanism for the UAV-enabled ISAC system to provide a more flexible trade-off between two integrated functionalities. Specifically, the system achievable rate is maximized via jointly optimizing UAV trajectory, user association, target sensing selection, and transmit beamforming, while meeting the sensing frequency and beam pattern gain requirement for the given targets. Despite that this problem is highly non-convex and involves closely coupled integer variables, we derive the closed-form optimal beamforming vector to dramatically reduce the complexity of beamforming design, and present a tight lower bound of the achievable rate to facilitate UAV trajectory design. Based on the above results, we propose a penalty-based algorithm to efficiently solve the considered problem. The optimal achievable rate and the optimal UAV location are analyzed under a special case of infinity number of antennas. Furthermore, we prove the structural symmetry between the optimal solutions in different ISAC frames without location constraints and propose an efficient algorithm for solving the problem with location constraints.

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