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Power Amplifiers

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Signal Processing Techniques for Power Efficient Wireless Communication Systems

Part of the book series: Signals and Communication Technology ((SCT))

Abstract

Conventionally, the power amplifier is considered the most power demanding device in a wireless transceiver. Following this assumption, improvements in the power efficiency of the power amplifier (PA) are directly reflected in the power consumption of the overall system. Considering the power consumption of a LTE macrocell base station , the PA drains around 57% of the total power, while the baseband processing requires only 13%. However, in a femtocell , the PA consumption represents only 22% of the total power and the portion of the digital block demands 47%. For the case of power limited devices, as a LTE mobile phone, the PA dominates the overall power consumption requiring 44% of the total available power. We can infer from these values that for high/medium power systems, as macrocell base stations, the implementation of linearization techniques or peak-to-average power ratio (PAPR) reduction methods are mandatory. In that case, their implementation allows to relax the linearity constraints and improve the power efficiency. A substantial energy saving can thus be obtained in that scenario. On the other hand, for low power transceivers , the trade-off between the energy saved by optimizing the PA operation point and the energy required to implement predistortion techniques needs to be carefully evaluated. In this chapter, we address the problem of power consumption in power amplifiers and their effects over energy efficiency and performance of a wireless transceiver. The trade-off between the allowed power amplifier distortion and the system power efficiency is studied. Several nonlinear distortion compensation techniques that can be applied either in the receiver or the transmitter side are introduced and their performance is studied for several scenarios.

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  1. Dpto. de Ing. Eléctrica y de Computadoras Universidad Nacional del Sur (UNS), Instituto de Inv. en Ing. Eléctrica “Alfredo Desages” (IIIE), UNS-CONICET, Bahía Blanca, Buenos Aires, Argentina

    Fernando Gregorio, Gustavo González, Christian Schmidt & Juan Cousseau

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  1. Fernando Gregorio
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  2. Gustavo González
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  4. Juan Cousseau
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Gregorio, F., González, G., Schmidt, C., Cousseau, J. (2020). Power Amplifiers. In: Signal Processing Techniques for Power Efficient Wireless Communication Systems. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-32437-7_4

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  • DOI: https://doi.org/10.1007/978-3-030-32437-7_4

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