A reconfigurable in-band digital predistortion technique for mmWave power amplifiers excited by a signal with 640 MHz modulation bandwidth

Yu, Chongxiu; Hou, Debin; Sun, Honglei; Meng, Fan; Zhu, Xiao‐Wei; Zhai, Jianfeng; Chen, Jixin; Yan, Pinpin; Zhu, Anding

doi:10.23919/eumc.2017.8231025

2017 47th European Microwave Conference (EuMC) 2017

DOI: 10.23919/eumc.2017.8231025

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A reconfigurable in-band digital predistortion technique for mmWave power amplifiers excited by a signal with 640 MHz modulation bandwidth

Chongxiu Yu¹,

Debin Hou²,

Honglei Sun³

et al.

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“…Yu et al [22] put forward and verified a near-band DPD at 41 GHz when aggregated carriers were noncontiguous. After that, a reconfigurable pyramid structure was presented, and it successfully linearized a four-carrier-aggregated signal of modulation BW of 640 MHz at 29 GHz by using the property of carrier aggregation [23]. In [24], the nonlinearity of concurrent dual-broadband phased array TXs was compensated around 27 GHz.…”

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Linear-Decomposition Digital Predistortion of Power Amplifiers for 5G Ultrabroadband Applications

Yin

et al. 2020

IEEE Trans. Microwave Theory Techn.

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This article proposes a novel linear-decomposition digital predistortion (LD-DPD) for the linearization of power amplifiers (PAs) in ultra broadband applications. LD-DPD is able to perform excellently with low complexity at the oversampling rate of only 1.5×. It combines leading terms with a linear decomposition of cross-terms, which can reduce the spectrum aliasing even when sampling rates are insufficient. The model complexity of the proposed model is quantified by floatingpoint operations. Experiments on broadband PAs at both sub-6-GHz and millimeter-wave frequencies have provided effective validations of the proposed model by employing the 5G New Radio (NR) waveforms. Particularly, the linearization of a signal with modulated bandwidth (BW) 800 MHz at 28 GHz was demonstrated. LD-DPD achieved a normalized root-mean-square error (NRMSE) of 3.34% for continuous 800-MHz modulated signal at the sampling rate of only 1.2 GHz.Compared with the already published DPDs, the proposed method is featured by high accuracy with limited available sampling rates to significantly reduce the system BW requirements. Also, it presents much lower complexity that will reduce expenses on hardware, which is very suitable for 5G ultra broadband applications.

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Linear-Decomposition Digital Predistortion of Power Amplifiers for 5G Ultrabroadband Applications

Yin

et al. 2020

IEEE Trans. Microwave Theory Techn.

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A robust multi‐sampling rate digital predistortion for ultra‐broadband power amplifiers

Liu

Chen

et al. 2019

Micro & Optical Tech Letters

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In this letter, a robust multisampling rate digital predistortion (DPD) scheme is proposed to linearize ultra‐broadband power amplifiers (PAs) under the limited DAC sampling rate. In the ultra‐broadband scenarios, it is no longer affordable to employ DACs with 3‐5 times over‐sampling rate, which will inevitably lead to spectrum aliasing for the sake of high order basis function and compromise the DPD performance. In order to improve the modeling accuracy, the input signal with low sampling rate will be up‐sampled firstly to generate nonaliasing basis functions. Then, after filtering and down‐sampling operation, the coefficients are extracted with low sampling rate. Moreover, the conventional behavioral model is modified with the linear‐spline basis functions to improve the stability and complexity. Measurements on Doherty PA and class‐AB PA with 100 MHz, 200 MHz, and 500 MHz bandwidth input signal at 2.1 GHz carrier frequency show the EVM can be improved to 0.71%, 0.94%, and 1.86% respectively.

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A reconfigurable in-band digital predistortion technique for mmWave power amplifiers excited by a signal with 640 MHz modulation bandwidth

Cited by 2 publications

References 2 publications

Linear-Decomposition Digital Predistortion of Power Amplifiers for 5G Ultrabroadband Applications

Linear-Decomposition Digital Predistortion of Power Amplifiers for 5G Ultrabroadband Applications

A robust multi‐sampling rate digital predistortion for ultra‐broadband power amplifiers

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