Multiple-input multiple-output (MIMO) systems using Rydberg atomic (RA) receivers face significant scalability challenges in signal detection due to their nonlinear signal models. This letter proposes phase-rotated symbol spreading (PRSS), which transmits each symbol across two consecutive time slots with an optimal π/2 phase offset. PRSS enables reconstruction of an effective linear signal model while maintaining spectral efficiency and facilitating the use of conventional RF-MIMO detection algorithms. Simulation results demonstrate that PRSS achieves greater than 2.5 dB and 10 dB bit error rate improvements compared to current single-transmission methods when employing optimal exhaustive search and low-complexity sub-optimal detection methods, respectively.

翻译：采用里德堡原子接收机的多输入多输出系统因其非线性信号模型，在信号检测方面面临显著的可扩展性挑战。本通讯提出相位旋转符号扩展技术，该技术通过最优π/2相位偏移将每个符号在两个连续时隙中传输。该方法能在保持频谱效率的同时重构有效的线性信号模型，并促进传统射频MIMO检测算法的应用。仿真结果表明：当分别采用最优穷举搜索和低复杂度次优检测方法时，相较于现有单次传输方案，相位旋转符号扩展技术可获得超过2.5分贝与10分贝的误码率性能提升。