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arXiv 2402.09155eess.SPcs.ITmath.IT
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面向集成感知与通信系统的联合鲁棒波束赋形框架

Joint and Robust Beamforming Framework for Integrated Sensing and Communication Systems

Jinseok Choi, Jeonghun Park, Namyoon Lee, Ahmed Alkhateeb

AI总结:

本文针对不完美CSI下的多用户多目标ISAC系统,提出一种联合通信与雷达波束赋形框架,以MSE或SCNR为雷达约束最大化总频谱效率,并通过NEPv与交替优化实现低复杂度鲁棒求解。

摘要:

集成感知与通信(ISAC)被广泛认为是未来无线通信的基础使能技术。本文提出了一种联合通信与雷达波束赋形框架,用于在多用户和多目标ISAC系统中,在不完美信道状态信息(CSI)条件下最大化总频谱效率(SE),同时保证所需的雷达性能。为此,我们采用雷达发射波束均方误差(MSE)或接收信杂噪比(SCNR)作为总SE最大化问题的雷达性能约束。为解决非凸性和不完美CSI等固有挑战,我们重新表述了问题,并确定了联合雷达与通信波束赋形器的一阶最优性条件。将该条件转化为具有特征向量依赖性的非线性特征值问题(NEPv),我们开发了一种交替方法,通过幂迭代求解联合波束赋形器,并通过二分搜索求解拉格朗日乘子。所提出的框架涵盖两种雷达指标,并且对信道估计误差具有鲁棒性,同时复杂度较低。仿真验证了所提出的方法。特别地,我们观察到MSE和SCNR约束根据工作环境表现出互补的性能,这体现了所提出的全面且鲁棒的优化框架的重要性。

英文摘要:

Integrated sensing and communication (ISAC) is widely recognized as a fundamental enabler for future wireless communications. In this paper, we present a joint communication and radar beamforming framework for maximizing a sum spectral efficiency (SE) while guaranteeing desired radar performance with imperfect channel state information (CSI) in multi-user and multi-target ISAC systems. To this end, we adopt either a radar transmit beam mean square error (MSE) or receive signal-to-clutter-plus-noise ratio (SCNR) as a radar performance constraint of a sum SE maximization problem. To resolve inherent challenges such as non-convexity and imperfect CSI, we reformulate the problems and identify first-order optimality conditions for the joint radar and communication beamformer. Turning the condition to a nonlinear eigenvalue problem with eigenvector dependency (NEPv), we develop an alternating method which finds the joint beamformer through power iteration and a Lagrangian multiplier through binary search. The proposed framework encompasses both the radar metrics and is robust to channel estimation error with low complexity. Simulations validate the proposed methods. In particular, we observe that the MSE and SCNR constraints exhibit complementary performance depending on the operating environment, which manifests the importance of the proposed comprehensive and robust optimization framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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