Joint dual-band crest factor reduction and digital predistortion of power amplifiers driven by inter-band carrier aggregated signals
Joint dual-band crest factor reduction and digital predistortion of power amplifiers driven by inter-band carrier aggregated signals
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DOI：
10.1109/mwsym.2014.6848542
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发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Bilel Fehri;S. Boumaiza
中科院分区：
文献类型：
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作者：
Bilel Fehri;S. Boumaiza
本文提出了一种带间载波聚合信号的信号幅度估计器，以协助有效地应用双频带波峰因数降低（CFR）和数字预失真（DPD）来增强双频带功率放大器（PA）的性能。作为概念验证的证明，双频带CFR被应用于将由以750 MHz为中心的10 MHz LTE信号和以900 MHz为中心的15 MHz LTE信号形成的载波聚合信号的峰均功率比降低2.5 dB，同时保持优于4%的误差向量幅度。然后通过双频带沃尔泰拉DPD对所得信号进行预处理，并用于线性化20 W宽带Doherty PA。双频CFR和DPD的联合应用成功地提高了功率放大器的性能，其线性平均输出功率约为4 W，漏极效率约为48%，邻道泄漏比约为-50 dBc。
In this paper, a signal amplitude estimator for inter-band carrier aggregated signals is proposed to assist with the effective application of dual-band crest factor reduction (CFR) and digital predistortion (DPD) for enhanced dual-band power amplifier (PA) performance. As proof of concept validation, the dual-band CFR was applied to reduce the peak to average power ratio of a carrier aggregated signal formed by a 10 MHz LTE signal, centered at 750 MHz, and a 15 MHz LTE signal, centered at 900 MHz, by 2.5 dB while maintaining an error vector magnitude of better than 4%. The resultant signal was then pre-processed by a dual-band Volterra DPD and used to linearize a 20 W broadband Doherty PA. The joint application of dual-band CFR and DPD succeeded in enhancing the performance of the PA by allowing a linear average output power of about 4 W, and drain efficiency of about 48%, with an adjacent channel leakage ratio of about -50 dBc.