An under-Sampling Restoration Digital Predistortion Technique Based on Landweber Iteration Algorithm

Tianfu CAI; Mingyu LI; Yi JIN; Changzhi XU

doi:10.11999/JEIT201051

Volume 43 Issue 11

Nov. 2021

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Tianfu CAI, Mingyu LI, Yi JIN, Changzhi XU. An under-Sampling Restoration Digital Predistortion Technique Based on Landweber Iteration Algorithm[J]. Journal of Electronics & Information Technology, 2021, 43(11): 3166-3173. doi: 10.11999/JEIT201051

Citation:

Tianfu CAI, Mingyu LI, Yi JIN, Changzhi XU. An under-Sampling Restoration Digital Predistortion Technique Based on Landweber Iteration Algorithm[J]. Journal of Electronics & Information Technology, 2021, 43(11): 3166-3173. doi: 10.11999/JEIT201051

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An under-Sampling Restoration Digital Predistortion Technique Based on Landweber Iteration Algorithm

doi: 10.11999/JEIT201051

1.
School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China
2.
China Academy of Space Technology-Xi’an, Xi’an 710100, China

Funds: The National Natural Science Foundation of China (61801377, 62001375), The National Key Research and Development Program (2019YFB1803102)

Received Date: 2020-12-14
Rev Recd Date: 2021-07-01

Available Online: 2021-07-07

Publish Date: 2021-11-23

Abstract

Abstract

In order to better correct the nonlinear characteristics of Power Amplifier (PA), conventional broadband Digital PreDistortion (DPD) requires usually the feedback channel bandwidth to be 5 times of the transmitting signal bandwidth, and Analog to Digital Converter (ADC) with higher sampling rate is required accordingly, which will lead to the hardware cost and energy consumption problems of digital predistortion system. To solve this problem, an Landweber iterative algorithm-based UnderSampled Restoration (USR) Digital PreDistortion method (Landweber-USR DPD) is propsed. It is processed in an internal and external loop, which can recover the full-band output signals from the undersampled PA output signals under the requirements that the sampling rate requirement of ADC is reduced from 5 times to twice. And the restored data is closer to the real PA output signals to achieve better pre-distortion effect. In experiment, a single-device Gallium Nitride (GaN) broadband class-F PA is excited by 5 MHz-LTE signal in 1.8 GHz frequency. The feedback ADC rate is set as full sampling rate (40 Msps) and undersampling rate (10 Msps), respectively. The experimental results fully demonstrate the reliability of Landweber iterative algorithm and the effectiveness of Landweber-USR DPD technology, which can provide an idea and method for effectively reducing ADC sampling rate in the engineering implementation of digital predistortion technology in broadband communication systems.
- Digital PreDistortion (DPD),
- Under-sampling,
- Internal and external loop,
- Landweber iteration

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References(21)

References

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