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arXiv 2602.16441eess.SP
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概念验证:MIMO系统中的局部TX实时相位校准

Proof of Concept: Local TX Real-Time Phase Calibration in MIMO Systems

Carl Collmann, Ahmad Nimr, Gerhard Fettweis

AI总结:

本文提出了一种用于MIMO系统的本地实时相位校准方法,通过比较瞬时和平滑校准方法,验证了其在不同SDR模型中的有效性,实现了高精度的相干传输。

摘要:

MIMO系统中的信道测量依赖于精确的同步。虽然时间同步和频率同步的方法已经成熟,但维持实时相位一致性仍然是许多MIMO系统的一个开放需求。MIMO系统中的相位一致性对于数字阵列中的波束成形至关重要,并且能够实现精确的参数估计,如到达角/离去角。本文提出了并验证了一种简单的本地实时相位校准方法用于数字阵列。我们比较了两种不同的方法,即瞬时校准和平滑校准,以确定同步程序之间的最佳间隔。为了定量评估校准性能,我们使用了两个指标:平均波束成形功率损失和RMS周期间抖动。我们的结果表明,两种相位校准方法都有效,并且对于不同的SDR模型,RMS抖动在2.1 ps到124 fs范围内。这种精度水平使得可以在常见的SDR平台上实现相干传输,从而能够研究先进的MIMO技术以及在实际测试床上的发射波束成形。

英文摘要:

Channel measurements in MIMO systems hinge on precise synchronization. While methods for time and frequency synchronization are well established, maintaining real-time phase coherence remains an open requirement for many MIMO systems. Phase coherence in MIMO systems is crucial for beamforming in digital arrays and enables precise parameter estimates such as Angle-of-Arrival/Departure. This work presents and validates a simple local real-time phase calibration method for a digital array. We compare two different approaches, instantaneous and smoothed calibration, to determine the optimal interval between synchronization procedures. To quantitatively assess calibration performance, we use two metrics: the average beamforming power loss and the RMS cycle-to-cycle jitter. Our results indicate that both approaches for phase calibration are effective and yield RMS of jitter in the 2.1 ps to 124 fs range for different SDR models. This level of precision enables coherent transmission on commonly available SDR platforms, allowing investigation on advanced MIMO techniques and transmit beamforming in practical testbeds.

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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