Efficiency Maximization for Battery-Powered OFDM Transmitter via Amplifier Operating Point Adjustment
Abstract
:1. Introduction
1.1. Background and Motivation
1.2. Contribution
1.3. Paper Organization
2. Materials and Methods
2.1. PA Nonlinearity Model
2.2. Battery Model
2.3. PA Energy Consumption Model
- Perfect PA In this case, it is assumed that the total PA power consumption is equal to the radiated waveform power, i.e.,
- Class A PA Both for a Rapp-modeled PA and its simplification (soft-limiter) the mean battery drained power equals to
- Class B PA The mean battery drained power for Rapp-modeled class B PA can be calculated numerically using the equation
- Perfect PA For the Rapp-modeled PA, the mean battery-drained power can be calculated using the formula:
2.4. Transmission Efficiency
2.4.1. Spectral Efficiency Optimization
2.4.2. Energy Efficiency Optimization
3. Results and Discussion
4. Conclusions
Funding
Conflicts of Interest
References
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Paper | Description |
---|---|
[7] | Models both the impact of nonlinearity on OFDM signal reception and supply power consumption. However, the optimal IBO value is not analyzed for either SE or for EE maximization. It does not consider a battery model. |
[11] | Derives optimal IBO value for a soft-limiter PA that maximizes SE. Does not consider the Rapp model, PA power consumption, or battery model. |
[14] | The optimal IBO value is derived for SE optimization under soft-limiter PA (as in [11]). Power consumption for a class B PA is derived and used for fog computing optimization. The battery model is not included. |
[15] | It uses soft-limiter and class B Pa models in parallel to models of other transceiver components to optimize utilized power and achievable rate. Does not consider the Rapp model or battery models. |
[18,19] | Optimizes the efficiency of battery-powered single-carrier sensor transmitters. Does not consider OFDM signal. |
Symbol | Description |
---|---|
instantaneous power drained from the battery | |
instantaneous power used to power the PA | |
instantaneous power used by digital and analog signal processing | |
mean power (variance) of the OFDM signal on the PA input | |
maximum possible sample power at the PA output (saturation power) | |
p | smoothing factor of a Rapp-modeled PA |
a battery characteristic parameter | |
x | complex Gaussian-distributed OFDM signal sample on the PA input |
z | Rayleigh-distributed amplitude of the OFDM sample on the PA input |
y | amplitude of the OFDM signal sample on the PA output |
normalized PA input signal amplitude | |
h | a wireless channel transmittance |
B | occupied OFDM signal bandwidth |
scaling factor of x signal on the PA output as defined by (7) | |
nonlinear distortion samples on the PA output | |
n | white noise sample added in the receiver |
Input Back-Off defined by (5) | |
SNR if a single carrier signal transmitted the maximum possible power , as defined below (18). |
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© 2023 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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Kryszkiewicz, P. Efficiency Maximization for Battery-Powered OFDM Transmitter via Amplifier Operating Point Adjustment. Sensors 2023, 23, 474. https://doi.org/10.3390/s23010474
Kryszkiewicz P. Efficiency Maximization for Battery-Powered OFDM Transmitter via Amplifier Operating Point Adjustment. Sensors. 2023; 23(1):474. https://doi.org/10.3390/s23010474
Chicago/Turabian StyleKryszkiewicz, Pawel. 2023. "Efficiency Maximization for Battery-Powered OFDM Transmitter via Amplifier Operating Point Adjustment" Sensors 23, no. 1: 474. https://doi.org/10.3390/s23010474
APA StyleKryszkiewicz, P. (2023). Efficiency Maximization for Battery-Powered OFDM Transmitter via Amplifier Operating Point Adjustment. Sensors, 23(1), 474. https://doi.org/10.3390/s23010474