收发器非线性天线阵列辐射失真的空间特性
Spatial Characteristics of Distortion Radiated from Antenna Arrays with Transceiver Nonlinearities
摘要：
研究了大规模MIMO（多输入多输出）基站非线性放大器的失真，推导了其辐射方向图。分析了带内和带外的失真。通过使用放大信号的正交Hermite表示，非线性失真的空间互相关矩阵得到。它表明，如果放大器的输入信号具有主导波束，则失真以与该波束相同的方式进行波束成形。当有多个光束，而没有任何一个是占主导地位的，它示出的失真实际上是各向同性的。推导出的理论是有用的，以预测如何的非线性失真将表现，分析带外辐射，做互易校准，并在频率平面上调度用户，以尽量减少带内失真的影响。
英文摘要：
The distortion from massive MIMO (multiple-input--multiple-output) base stations with nonlinear amplifiers is studied and its radiation pattern is derived. The distortion is analyzed both in-band and out-of-band. By using an orthogonal Hermite representation of the amplified signal, the spatial cross-correlation matrix of the nonlinear distortion is obtained. It shows that, if the input signal to the amplifiers has a dominant beam, the distortion is beamformed in the same way as that beam. When there are multiple beams without any one being dominant, it is shown that the distortion is practically isotropic. The derived theory is useful to predict how the nonlinear distortion will behave, to analyze the out-of-band radiation, to do reciprocity calibration, and to schedule users in the frequency plane to minimize the effect of in-band distortion.
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