一种低复杂度的并发双频数字预失真模型

A Low-Complexity Concurrent Dual-Band Digital Predistortion Model

由于多标准通信制式的发展,并发双频功率放大器的数字预失真线性化技术近年来备受关注。文中提出一种低复杂度的并发双频数字预失真模型。与已报道的简化二维记忆多项式模型相比,该模型通过引入同阶包络交叉项增强对双频功率放大器中非线性互调失真的补偿能力。新模型能够取得比简化二维记忆多项式模型更好的建模精度和线性化性能,同时保持了便于利用一维查找表实现的优点。对新模型与其它双频模型的线性化性能与模型复杂度进行了比较,仿真与测试结果表明新模型在性能和复杂度之间取得了良好的折中。

With the development of multi-standard communication,digital predistortion for linearizing dual-band power amplifiers( PAs) operating in the concurrent mode has aroused much interest recently. This paper proposes a low-complexity model for concurrent dual-band digital predistortion. Compared with the reported simplified 2D memory polynomial( S2D-MP) model,the proposed model incorporates envelop cross terms of equal order to compensate for cross-modulation nonlinear distortion in concurrent dual-band PAs even better. The proposed model enhances the modeling accuracy of S2 DMP and yields better linearization performance,while keeping the merits of easy implementation with 1D lookup tables at the same time. Linearization performance and model complexity of the new model are compared with those of other state-of-the-art models. Simulation and measurement results demonstrate that the new model is a good tradeoff between performance and complexity.