AI 中文总结
针对RAQRs在DD信道的光学模糊问题，提出MC-AFDM波形并设计基于OMP与LS的算法，使其估计精度较SC-AFDM提升达两个数量级，验证了其高分辨率量子无线传感优势。
AI 中文摘要
针对里德堡原子量子接收机（RAQRs）提出多啁啾仿频分复用（MC-AFDM）方案，用于联合延迟-多普勒估计。该研究的动机在于，RAQRs虽具备优异灵敏度与传感优势，但双色散（DD）信道中因目标移动产生的多普勒频移会导致光学模糊，无法可靠估计延迟-多普勒参数。为解决该模糊问题、释放RAQRs在DD信道的潜力，所提MC-AFDM采用多个不同的AFDM后啁啾信号，克服经典单啁啾AFDM（SC-AFDM）的秩亏问题，实现对多目标的精准延迟-多普勒估计。分析表明，多个后啁啾参数的边缘分布可通过最小化条件数进一步提升估计精度。基于所提MC-AFDM波形，设计了基于正交匹配追踪（OMP）与最小二乘（LS）的序贯信号处理算法，并推导了延迟与多普勒估计的理论下界。数值结果显示，与经典SC-AFDM相比，所提MC-AFDM将距离与速度估计精度提升达两个数量级，且通过后啁啾优化逼近其理论下界，验证了RAQRs在高分辨率量子无线传感中的量子诱导优势。
英文摘要
We propose a multi-chirp affine frequency division multiplexing (MC-AFDM) scheme for joint delay-Doppler estimation with Rydberg atomic quantum receivers (RAQRs). The work is motivated by the fact that RAQRs, while offering superior sensitivity and advantageous sensing capabilities, suffer from an optical ambiguity due to Doppler shifts in doubly-dispersive (DD) channel caused by target mobility, which precludes the reliable estimation of delay-Doppler parameters. To resolve this optical ambiguity and unleash the potential of RAQRs in DD channel, the proposed MC-AFDM employs multiple distinct AFDM post-chirp signals to overcome the rank-deficiency problem of the classical single-chirp AFDM (SC-AFDM), thereby enabling accurate delay-Doppler estimation of multiple targets. Our analysis reveals that the edge distribution of the multiple post-chirp parameters can further improve estimation accuracy by minimizing the condition number. Building on the proposed MC-AFDM waveform, we design a sequential signal processing algorithm based on orthogonal matching pursuit (OMP) and least squares (LS), and we derive the theoretical lower bounds for delay and Doppler estimation. Numerical results show that the proposed MC-AFDM improves range and velocity estimation accuracy by up to two orders of magnitude compared to the classical SC-AFDM, and approaches its theoretical bounds through post-chirp optimization, validating the quantum-induced advantage of RAQRs for high-resolution quantum wireless sensing.
CommentsSubmitted to IEEE Journal
