FDD MIMO中外源无源互调的物理建模与消除
Physical Modelling and Cancellation of External Passive Intermodulation in FDD MIMO
AI总结：
本文提出了一种在FDD MIMO系统中直接模拟物理外源无源互调（PIM）的方法，通过构建包含点源PIM、偶极子天线和5G NR OFDM信号等模型，验证了多PIM源补偿算法，仿真效果与实际实验相当，从而免除了开发阶段对真实硬件实验的依赖。
摘要：
本文提出了在具有任意数量收发链路的频分双工（FDD）多输入多输出（MIMO）系统中，对外源（空气诱导的）无源互调（PIM）进行建模的物理方法。外源PIM是互调失真（IMD）的一种特殊情况，主要由具有非线性特性的金属物体（“锈螺栓”效应）产生。通常，此类源位于天线阵列的近场或过渡区域。PIM产物可能落入FDD系统的接收频带，对上行链路信号产生负面影响。与其他工作不同，本文直接模拟了物理外源PIM。该系统包括点源外源PIM模型、有限长度偶极子天线模型、MIMO天线阵列模型以及基带多载波5G NR OFDM信号模型。复制了用于多PIM源补偿的信道系数方法，以验证所提出的外源PIM建模方法。人工生成PIM消除的仿真结果显示出与实际实验相似的性能。因此，所提出的方法允许在具有许多天线和任意阵列结构的大型系统上测试PIM补偿算法。这消除了在PIM消除算法开发阶段使用真实硬件进行实验的需要。
英文摘要：
In this paper, the physical approach to model external (air-induced) passive intermodulation (PIM) is presented in a frequency-division duplexing (FDD) multiple-input multiple-output (MIMO) system with an arbitrary number of transceiver chains. The external PIM is a special case of intermodulation distortion (IMD), mainly generated by metallic objects possessing nonlinear properties ("rusty bolt" effect). Typically, such sources are located in the near-field or transition region of the antenna array. PIM products may fall into the receiver band of the FDD system, negatively affecting the uplink signal. In contrast to other works, this one directly simulates the physical external PIM. The system includes models of a point-source external PIM, a finite-length dipole antenna, a MIMO antenna array, and a baseband multicarrier 5G NR OFDM signal. The Channel coefficients method for multi-PIM-source compensation is replicated to verify the proposed external PIM modelling approach. Simulation results of artificially generated PIM cancellation show similar performance as real-life experiments. Therefore, the proposed approach allows testing PIM compensation algorithms on large systems with many antennas and arbitrary array structures. This eliminates the need for experiments with real hardware at the development stage of the PIM cancellation algorithm.
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。
