Abstrakti
This paper proposes sample combining as a low-complex and effective feedback data compression technique that allows to significantly reduce the computational effort and buffering needs for parameter adaptation in a closed-loop digital predistortion (DPD) system. Compression is achieved by applying an integrate & dump operation to an undersampled feedback signal. The proposed method is experimentally validated for RF measurement based behavioral modeling as well as closed-loop DPD of a 3.5 GHz GaN Doherty PA, taking also quantization effects of the feedback path into account. Our results demonstrate that the proposed technique is as capable as state-of-the-art histogram-based sample selection, however, at a much lower complexity.
Alkuperäiskieli | Englanti |
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Otsikko | 2023 IEEE/MTT-S International Microwave Symposium, IMS 2023 |
Kustantaja | IEEE |
Sivut | 795-798 |
Sivumäärä | 4 |
ISBN (elektroninen) | 9798350347647 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 2023 |
OKM-julkaisutyyppi | A4 Artikkeli konferenssijulkaisussa |
Tapahtuma | IEEE/MTT-S International Microwave Symposium - San Diego, Yhdysvallat Kesto: 11 kesäk. 2023 → 16 kesäk. 2023 |
Julkaisusarja
Nimi | IEEE MTT-S International Microwave Symposium Digest |
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Vuosikerta | 2023-June |
ISSN (painettu) | 0149-645X |
Conference
Conference | IEEE/MTT-S International Microwave Symposium |
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Maa/Alue | Yhdysvallat |
Kaupunki | San Diego |
Ajanjakso | 11/06/23 → 16/06/23 |
Rahoitus
V. CONCLUSION Sample combining for low-complexity feedback signal compression for DPD model adaptation was proposed in this paper. Despite the simplicity of the method, the presented experiments show that solid performances for PA behavioral modeling or closed-loop DPD can be reached with a significantly reduced data volume with the proposed method, while taking also a low-resolution quantization into account. The method was demonstrated to achieve similar performances as histogram-based sample selection, however with negligible added complexity. It is thus well suited for implementation. At the same time, the ADC rate and bit-width can be reduced, reducing the overall data load of the DPD system. ACKNOWLEDGMENT This project was funded by EU Horizon 2020 under the Marie Skłodowska-Curie grant agreement No. 860921, and by Academy of Finland under grants 319994, 338224, 332361. REFERENCES
Julkaisufoorumi-taso
- Jufo-taso 1
!!ASJC Scopus subject areas
- Radiation
- Condensed Matter Physics
- Electrical and Electronic Engineering