Title: Compressed Multiband Sensing in FR3 Using Alternating Direction Method of Multipliers Show Chinese title

Title: 基于交替方向乘子法的FR3中压缩多频段感知

Abstract: Joint detection and localization of users and scatterers in multipath-rich channels on multiple bands is critical for integrated sensing and communication (ISAC) in 6G. Existing multiband sensing methods are limited by classical beamforming or computationally expensive approaches. This paper introduces alternating direction method of multipliers (ADMM)-assisted compressed multiband sensing (CMS), hereafter referred to as ADMM-CMS, which is a novel framework for multiband sensing using uplink QAM-modulated pilot symbols. To solve the CMS problem, we develop an adaptive ADMM algorithm that adjusts to noise and ensures automatic stopping if converged. ADMM combines the decomposability of dual ascent with the robustness of augmented Lagrangian methods, making it suitable for large-scale structured optimization. Simulations show that ADMM-CMS achieves higher spatial resolution and improved denoising compared to Bartlett-type beamforming, yielding a 34 dB gain in per-antenna transmit power for achieving a 0.9 successful recovery probability (SRP). Moreover, compared to performing compressed sensing separately on the constituent 7 GHz and 10 GHz sub-bands, ADMM-CMS achieves reductions in delay root mean squared error of 35% and 38.1%, respectively, at -41 dBm per-antenna transmit power, while also yielding improved SRP. Our findings demonstrate ADMM-CMS as an efficient enabler of ISAC in frequency range 3 (FR3, 7-24 GHz) for 6G systems. Show Chinese abstract

Abstract: 多频段中用户和散射体的联合检测与定位对于6G中的集成感知与通信(ISAC)至关重要。现有的多频段感知方法受到经典波束成形或计算成本高昂的方法的限制。本文介绍了辅助交替方向乘子法(ADMM)的压缩多频段感知(CMS)，以下简称ADMM-CMS，这是一种使用上行QAM调制导频符号的多频段感知的新框架。为了解决CMS问题，我们开发了一种自适应ADMM算法，该算法能够适应噪声并在收敛时确保自动停止。ADMM结合了对偶上升的可分解性与增广拉格朗日方法的鲁棒性，使其适用于大规模结构化优化。仿真结果表明，与巴特利特型波束成形相比，ADMM-CMS在空间分辨率和去噪方面表现更优，在达到0.9成功恢复概率(SRP)时，每个天线的发射功率提高了34 dB。此外，与分别在7 GHz和10 GHz子带进行压缩感知相比，ADMM-CMS在每个天线发射功率为-41 dBm时，分别将延迟均方根误差减少了35%和38.1%，同时提高了SRP。我们的研究结果表明，ADMM-CMS是6G系统在频率范围3(FR3, 7-24 GHz)中实现ISAC的有效促进者。