A load-modulated low-power amplifier with average power tracking

Mimis, Konstantinos; Wang, S.; Watkins, Gareth

doi:10.1109/eumc.2015.7345706

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Here an alternative method of adaptive load pull, together with supply voltage modulation, is proposed. Similar work has been done in [5], however with wideband signals and still with the need for additional control signal generation and feedback . This system uses MAC layer information for its operation, removing the need for feedback or high speed analogue to digital converters (ADCs) for sampling and control.…”

Section: Introductionmentioning

confidence: 88%

Efficiency enhancement of M2M communications over LTE using adaptive load pull techniques

Birchall

Falco

Morris

et al. 2017

2017 IEEE Radio and Wireless Symposium (RWS)

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Section: Introductionmentioning

confidence: 88%

Efficiency enhancement of M2M communications over LTE using adaptive load pull techniques

Birchall

Falco

Morris

et al. 2017

2017 IEEE Radio and Wireless Symposium (RWS)

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“…Furthermore, the design of reconfigurable PAs may improve efficiency under modulated signals, which typically have a high peak-to-average power ratio (PAPR) and limit the average output power of the transmitter device. A graceful power back-off is demonstrated in [22], where a combination of source and load modulation is proposed for larger efficiency improvements at low output power over high PAPR signals. Measurement results show an efficiency of the PA of up to 44% at 13 dBm with 7.4 dB PAPR.…”

Section: A Related Workmentioning

confidence: 99%

Energy Efficiency in Multiple Antenna Machine-Type Communications With Reconfigurable RF Transceivers

et al. 2019

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In machine-type communication (MTC) networks, each node is equipped with a set of radiofrequency (RF) transceivers, antennas and power source. Besides, wireless nodes are typically batterypowered, whose recharging or replacement is often not viable or even impossible. Therefore, in such systems where energy is at a premium, minimizing power consumption improves energy efficiency and increases battery lifetime. In this paper, a novel energy-saving approach includes in the communication system model the use of reconfigurable RF transceivers. More specifically, the components involved in our power minimization framework are the power amplifier (PA) at the transmitter and the low noise amplifier (LNA) at the receiver, which are the blocks responsible for RF amplification and are on top of power consuming blocks in RF transceivers. Our goal is to show that RF circuits based on multimode operation can significantly improve the energy efficiency. We perform a joint selection of the best operating modes for PA and LNA circuits in different communication scenarios. Results show that by combining PA and LNA operating modes, an improvement of more than 75% in energy efficiency is obtained for multiple antenna communications, when compared to the state-of-the-art literature of non-reconfigurable amplifiers. Besides, we show that adapting spectral efficiency contributes towards improving energy efficiency. In this case, we consider different spectral efficiency values, including the effect that the PA operates at different backed-off power levels. In addition, when comparing single-input single-output (SISO) and multiple-input multiple-output (MIMO) transmission schemes, antenna selection (AS) outperforms the others schemes in terms of energy efficiency for short and moderate distances, but singular value decomposition (SVD) allows for longer communication distances. INDEX TERMS Energy efficiency, reconfigurable RF transceivers, machine-type communications, multiple antennas.

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A flexible, dynamically load-modulated GaN power amplifier for the UHF band

Mimis

Watkins

2016

2016 German Microwave Conference (GeMiC)

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A load-modulated low-power amplifier with average power tracking

Cited by 6 publications

References 11 publications

Efficiency enhancement of M2M communications over LTE using adaptive load pull techniques

Efficiency enhancement of M2M communications over LTE using adaptive load pull techniques

Energy Efficiency in Multiple Antenna Machine-Type Communications With Reconfigurable RF Transceivers

A flexible, dynamically load-modulated GaN power amplifier for the UHF band

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