Multiport Transmitter Front-End Architecture for Concurrent Dual-Band Digital Predistortion

This brief proposes a multiport transmitter front-end (MTFE) architecture to bolster the concurrent dual-band transmission while supporting the digital predistortion (DPD) processing. The proposed architecture consists of two back-to-back multiport networks driven by only one local oscillator (LO) t...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2024-02, Vol.71 (2), p.572-576
Main Authors: Tu, Mengting, Cheong, Pedro, Choi, Wai-Wa, Wu, Ke
Format: Article
Language:English
Subjects:
Concurrent dual-band operation
digital predistortion
Dual band
Feedback loop
Feedback loops
Multilayers
multiport transmitter
OFDM
Performance evaluation
power amplifier
Power amplifiers
Power dividers
Predistortion
Radio frequency
RF signals
Transmitters
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Summary:This brief proposes a multiport transmitter front-end (MTFE) architecture to bolster the concurrent dual-band transmission while supporting the digital predistortion (DPD) processing. The proposed architecture consists of two back-to-back multiport networks driven by only one local oscillator (LO) through a multilayer power divider. The low-power LO source can effectively suppress the growth of intermodulations in/between the transmit and DPD feedback loop, thereby optimizing transmission performance. Furthermore, the architecture makes full use of the mainstream DPD architectures, like the frequency-selective (FS) method, to migrate the in-band/cross-band distortions and the adjacent channel interference (ACI) caused by the nonlinearity of the power amplifiers. In experiments, we evaluate the performance of the proposed MTFE architecture over the QAM and OFDM signals. The results consistently demonstrate excellent DPD performance under concurrent dual-band transmission.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2023.3308597