Companding and Predistortion Techniques for Improved Efficiency and Performance in SWIPT
arXiv (Cornell University)(2023)
摘要
In this work, we analyze how the use of companding techniques, together with
digital predistortion (DPD), can be leveraged to improve system efficiency and
performance in simultaneous wireless information and power transfer (SWIPT)
systems based on power splitting. By taking advantage of the benefits of each
of these well-known techniques to mitigate non-linear effects due to power
amplifier (PA) and energy harvesting (EH) operation, we illustrate how DPD and
companding can be effectively combined to improve the EH efficiency while
keeping unalterable the information transfer performance. We establish design
criteria that allow the PA to operate in a higher efficiency region so that the
reduction in peak-to-average power ratio over the transmitted signal is
translated into an increase in the average radiated power and EH efficiency.
The performance of DPD and companding techniques is evaluated in a number of
scenarios, showing that a combination of both techniques allows to
significantly increase the power transfer efficiency in SWIPT systems.
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关键词
swipt,predistortion techniques
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