In hybrid beamforming, the beam oriented digital predistortion (BO-DPD) is incompetent to linearize the output in different directions except the desired direction to the transmitter. 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. Here, the optimized PW coefficients are multiplied by the polynomial basis functions 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：在混合波束赋形中，面向波束的数字预失真（BO-DPD）除了在发射机期望方向外，无法线性化其他方向上的输出信号。因此，在BO-DPD操作之后，我们采用后加权（PW）处理，以最小化宽角度范围内的非线性辐射。将优化后的PW系数与BO-DPD的多项式基函数相乘，所得信号被分配到功率放大器（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，进而推导出低复杂度后加权（LC-PW）方案。