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IJSTR >> Volume 9 - Issue 12, December 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Digital Predistortion Linearization For Carrier Aggregation And Wide Bandwidth

[Full Text]



R. Zepeda-Puebla



carrier aggregation (CA), cubic spline (CS), digital predistortion (DPD), linearization, power amplifier (PA), radio frequency (RF), wireless communications.



Development of a digital predistortion (DPD) linearization system of a power amplifier (PA) for carrier aggregation (CA) and wide-bandwidth, radio-frequency (RF) signals is presented. A methodology for optimizing parameter values in a Volterra-based, cubic spline interpolation model is proposed. The optimized models and the DPD system itself are validated in a RF-sampling, FPGA-based experimental testbed. Performance is evaluated using the normalized mean square error (NMSE) and the adjacent-channel power ratio (ACPR) figures of merit for three different excitations of varying number of component carriers (CCs) and total bandwidth. NMSE is found to improve by 33 dB on average when compared to the case where no DPD is applied, while ACPR improves by 15.6 dBc on average for the same comparison.



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