发表机构
Beijing Jiaotong University; Huawei Wireless RAN Research Department（北京交通大学; 华为无线RAN研究部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对里德伯原子接收机用于集成感知与通信时面临的原子响应权衡，本文提出多分支架构模型，揭示带宽与响应及带间增益抑制的内在约束，并联合优化耦合强度和本振功率以刻画CRB-速率区域。
AI 中文摘要
集成感知与通信（ISAC）是下一代无线网络的关键技术，需要具有多频段覆盖能力的高灵敏度、紧凑型接收机前端。里德伯原子接收机（RARs）凭借其高灵敏度和连续频率调谐能力，提供了一种满足这些要求的有前景的架构。与采用正交资源分配的经典ISAC系统不同，在单个原子系综内执行并发的多频段任务依赖于共享的能量态跃迁。由于这种共享结构，基于RAR的ISAC中的通信与感知权衡引入了超越经典子空间和确定性-随机权衡的原子响应权衡。本文研究了一种用于联合通信与雷达感知的多分支里德伯原子接收机（MB-RAR）架构。通过在本振（LO）偏置工作点求解五能级Lindblad主方程，并将通信和感知射频（RF）信号线性化为小扰动，我们获得了MB-RAR的双边带动态信号响应。该模型揭示了两个内在约束。首先，增加耦合激光强度会拓宽响应带宽，但可能削弱原子响应。其次，增强一个分支的LO会通过共享的里德伯态抑制另一个分支的转换增益，即使后者的LO偏置保持不变，这被称为带间增益抑制（IBGI）。基于这些机制，我们构建了可实现的克拉美-罗界（CRB）-速率区域，并开发了一种在耦合强度和LO功率分配上进行速率约束的联合搜索方法。数值结果验证了所提出的响应模型，并表明联合优化能够更完整地刻画可实现的CRB-速率区域。
英文摘要
Integrated sensing and communication (ISAC) is a key technology for next generation wireless networks, requiring highly sensitive, compact receiver front ends with multiband coverage. Rydberg atomic receivers (RARs) provide a promising architecture that satisfies these requirements owing to their high sensitivity and continuous frequency tuning capability. Unlike in classical ISAC systems utilizing orthogonal resource allocation, executing concurrent multi band tasks within a single atomic ensemble relies on shared energy state transitions. Owing to this shared structure, the communication and sensing tradeoff in RAR-based ISAC introduces an atomic-response tradeoff beyond the classical subspace and deterministic-random tradeoffs. This paper studies a multi-branch RAR (MB-RAR) architecture for joint communication and radar sensing. By solving the five level Lindblad master equation at the local oscillator (LO) biased operating point and linearizing the communication and sensing radio frequency (RF) signals as small perturbations, we obtain the double-sideband dynamic signal response of the MB-RAR. The model reveals two intrinsic constraints. First, increasing the coupling laser strength broadens the response bandwidth but can weaken the atomic response. Second, strengthening one branch's LO can suppress the other branch's conversion gain through the shared Rydberg state, even when the latter's LO bias remains fixed, which is termed the inter band gain inhibition (IBGI). Based on these mechanisms, we formulate the achievable Cramér--Rao bound (CRB)-rate region and develop a rate-constrained joint search over coupling strength and LO power allocation. Numerical results validate the proposed response model and show that joint optimization provides a more complete characterization of the achievable CRB-rate region.
