The beam-oriented digital predistortion (BO-DPD) is not sufficient to linearize the output from a subarray of power amplifiers (PAs) in different directions except the desired direction. Therefore, subsequent to the BO-DPD operation, we perform a post-weighting (PW) processing to minimize the nonlinear radiations in the wide range of directions under crosstalk. Here, the optimized PW coefficients are multiplied by the polynomial terms of the BO-DPD, then, the resultant signals are distributed to the PAs to compensate the nonlinear radiations. In this work, first, we propose fully-featured post-weighting (FF-PW) scheme, then, we derive a low-complexity post-weighting (LC-PW) scheme.

翻译：面向波束的数字预失真（BO-DPD）技术仅能在期望方向上对功率放大器（PA）子阵的输出进行线性化处理，而无法覆盖其他方向。为此，我们在BO-DPD操作之后引入后加权（PW）处理，以在交叉串扰环境下抑制宽角度范围内的非线性辐射。具体而言，将优化后的PW系数与BO-DPD的多项式项相乘，再将所得信号分配至各PA以补偿非线性辐射。本文首先提出全功能后加权（FF-PW）方案，进而推导出一种低复杂度后加权（LC-PW）方案。