A Digital Predistortion System With Extended Correction Bandwidth With Application to LTE-A Nonlinear Power Amplifiers

作者：Hammi Oualid^*; Kwan Andrew; Bensmida Souheil; Morris Kevin A; Ghannouchi Fadhel M

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2014, 61(12): 3487-3495.

DOI：10.1109/TCSI.2014.2337235

• Analog to digital converter (ADC)
• digital predistortion (DPD)
• distortion
• field programmable gate arrays
• memory effects
• nonlinearity
• power amplifier (PA)

This article presents a bandwidth extended digital predistortion system suitable for LTE-advanced applications. The proposed predistortion system uses a two-box architecture based on the cascade of a memory polynomial followed by a memoryless predistortion function. The memoryless predistorter is ident(i)fied offline and used to perform a coarse linearization which cancels out most of the static nonlinearity of the device under test allowing for a reduced observation bandwidth for the synthesis of the memory polynomial predistortion sub-function. The proposed predistorter was experimentally validated and its performance benchmarked against a predistorter having the same structure but identified using the conventional approach. The measurement results demonstrate that the proposed predistorter requires 30% less sampling speed for the analog to digital converter of the feedback path.

• 出版日期2014-12
• 单位中国石油大学（北京）