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Weighted Polynomial Digital Predistortion for Low Memory Effect Doherty Power Amplifier

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8 Author(s)
Sungchul Hong ; Telecommun. Res. & Dev. Center, Samsung Electron. Co. Ltd, Gyeonggi ; Young Yun Woo ; Jangheon Kim ; Jeonghyeon Cha
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We have proposed a simple and effective weighted polynomial digital predistortion algorithm, which consists of weighting, least square polynomial fit, and de-weighting. The weighting factor is introduced to describe the signal distribution statistics and high harmonic generation at a high power region to improve accuracy of the error function. A low memory linear Doherty power amplifier (PA) has been realized with two 90-W peak envelope power LDMOSFETs using memory effect reduction techniques, and the proposed algorithm has been applied to the PA. For the forward-link wideband code division multiple access 3FA signal, the adjacent channel leakage ratio performance at 5-MHz offset is -56 dBc with power-added efficiency of 20.78% at an average power of 40 dBm. The proposed weighting polynomial algorithm provides a significantly reduced error power and superior convergence behavior with improved linearization capability than the conventional polynomial. Moreover, the low memory Doherty amplifier could be linearized for a wideband signal using the simple algorithm without any memory effect compensation

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 5 )