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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。
Due to the development of multi-standard communication system, digital predistortion linearization technology of dual-frequency power amplifier has drawn much attention in recent years. This paper presents a low complexity of dual-frequency digital pre-distortion model. Compared with the reported simplified two-dimensional memory polynomial model, this model enhances the compensation of the nonlinear intermodulation distortion in the dual-frequency power amplifier by introducing the same-order envelope crossover term. The new model achieves better modeling accuracy and linearization performance than a simplified two-dimensional memory polynomial model, while maintaining the advantages of ease of implementation with one-dimensional look-up tables. The linearization performance and model complexity of the new model and other dual-frequency models are compared. The simulation and test results show that the new model achieves a good compromise between performance and complexity.