Linearization of a Multi-Band Multi-target Directional Modulation Transmitter Using Low-Complexity Crosstalk-Cancelled Digital Predistortion

This paper presents a multi-band multi-target (MBMT) directional modulation (DM) transmitter with low complexity crosstalk-cancelled digital predistortion (DPD). For a 16QAM 20 MHz bandwidth signal with -20 dB crosstalk, 8.0 dB PAPR, and 0.7 DM power efficiency (PE) level, the corresponding error ve...

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Bibliographic Details
Main Authors: Long Chen, Wenhua Chen, Youjiang Liu, Xin Liu, Zhenghe Feng
Format: Conference Proceeding
Language:English
Subjects:
complexity
Crosstalk
digital predistortion (DPD)
Directional modulation (DM)
Information filters
linearization
Mathematical model
Microwave filters
Radio transmitters
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Summary:This paper presents a multi-band multi-target (MBMT) directional modulation (DM) transmitter with low complexity crosstalk-cancelled digital predistortion (DPD). For a 16QAM 20 MHz bandwidth signal with -20 dB crosstalk, 8.0 dB PAPR, and 0.7 DM power efficiency (PE) level, the corresponding error vector magnitude (EVM) and the adjacent channel power ratio (ACPR) are 2.14% and -50 dBc after the proposed crosstalk-cancelled DPD. Compared with the 2×2 parallel Hammerstein (2×2 PH) DPD, the proposed DPD reduces the computational complexity without sacrificing the linearization performance. It only has 37.5% of the number of coefficients of the 2×2 PH model. To our best knowledge, it is the first time that the nonlinear distortion of the power amplifiers (PA) and the crosstalk between paths are simultaneously considered in an MBMT DM transmitter.
ISSN:2576-7216
DOI:10.1109/MWSYM.2019.8701034