Energy- and Spectral- Efficiency Tradeoff in Nonlinear OFDM System of Visible Light Communications

Hei, Yongqiang; Liu, Xuexue; Li, Wentao; Wang, Shuaikang; Huo, Mengchen

doi:10.1109/jlt.2021.3131666

Cited by 7 publications

(7 citation statements)

References 42 publications

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“…This paper adopts an amplitude nonlinearity Rapp HPA model due to the the low contribution of the phase for the multi-carrier signal in signal distortions. Rapp model is an Solid State Power Amplifiers (SSPA) HPA that has the characteristics of high reliability and low power, a zero-phase Rapp model used for the power amplifier expresses the signal input-output relationship as [36]:…”

Section: Hpa Modelmentioning

confidence: 99%

“…This paper adopts an amplitude nonlinearity Rapp HPA model due to the the low contribution of the phase for the multi‐carrier signal in signal distortions. Rapp model is an Solid State Power Amplifiers (SSPA) HPA that has the characteristics of high reliability and low power, a zero‐phase Rapp model used for the power amplifier expresses the signal input‐output relationship as [36]:

\begin{equation} {{\tilde{x}}_{i}}=\frac{{{x}_{i}}}{{{(1+{{(\frac{{\left| {{x}_{i}} \right|}}{{{A}_{sat}}})}^{2p}})}^{\frac{1}{2p}}}}, \end{equation}

where p is the Rapp's coefficient to control the smoothness of transition from the linear region to the saturation region, and

{{A}_{sat}}

is the saturation level.…”

Section: System Modelmentioning

confidence: 99%

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Continuous unconstrained PSO‐PTS strategy to maximize HPA energy efficiency for FBMC‐OQAM systems

Jin

et al. 2023

IET Communications

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In filter bank multi‐carrier (FBMC) with offset quadrature amplitude modulation (OQAM) systems, the major limitation of FBMC‐OQAM signaling is the high peak‐to‐average power ratio (PAPR). High PAPR results in increased hardware complexity and is also prone to non‐linear effects of high‐power amplifiers (HPA). The existing HPA energy‐efficient optimization strategies are constrained severely by the scarcity and heterogeneity of signal distribution in the degree of freedom. This paper theorizes the optimal FBMC‐OQAM signal distribution, which has a global and steady feature and evaluates the maximal HPA efficiency‐suited multi‐carrier modulation (MCM) signal. This paper first proposes that the Binary Particle Swarm Optimization based Partial Transmit Sequence (BPSO‐PTS) with the Input‐Back Off Modulation Error Ratio (IBO‐MER) scheme traces the signal distribution for maximal HPA efficiency to save supply‐side energy. This paper further proposes Continuous‐Unconstrained Particle Swarm Optimization based PTS(CUPSO‐PTS) with IBO‐MER to obtain the theoretical boundaries and drastically accelerate convergence in the continuous‐unconstrained searching space. To decrease the computational complexity of MER calculation, this paper proposes the CUPSO with IBO Signal‐to‐Distortion Ratio (IBO‐SDR), enabling it to meet more practical applications. The simulation results show that the proposed scheme outperforms conventional IBO and HPA efficiency schemes.

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Section: Hpa Modelmentioning

confidence: 99%

\begin{equation} {{\tilde{x}}_{i}}=\frac{{{x}_{i}}}{{{(1+{{(\frac{{\left| {{x}_{i}} \right|}}{{{A}_{sat}}})}^{2p}})}^{\frac{1}{2p}}}}, \end{equation}

where p is the Rapp's coefficient to control the smoothness of transition from the linear region to the saturation region, and

{{A}_{sat}}

is the saturation level.…”

Section: System Modelmentioning

confidence: 99%

Continuous unconstrained PSO‐PTS strategy to maximize HPA energy efficiency for FBMC‐OQAM systems

Jin

et al. 2023

IET Communications

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“…This paper adopted a nonlinear Rapp model without memory for the HPA. The Rapp model for a solid-state power amplifier (SSPA) was developed in [28], which is a memoryless HPA model with only an AM/AM function. The Rapp model can be represented as:…”

Section: Hpa Modelmentioning

confidence: 99%

Hybrid Energy Efficiency Friendly Frequency Domain TR Algorithm Based on PSO Algorithm Evaluated by Novel Maximizing HPA Efficiency Evaluation Criteria

Jin

et al. 2022

Energies

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Smart Grids (SGs) expedite secure, large-scale and efficient two-way communication between the power supply and management, but under a sophisticated 5G communication infrastructure, the multi carrier system is the principle system. The high peak-to-average power ratio (PAPR) is one of the significant limitations of the 5G multi carrier (MC) system, as it impedes the efficient design of the 5G analogue front end. Tone reservation (TR) is a highly efficient scheme without signal distortion, which is designed by increasing the freedom in the frequency domain for PAPR reduction. In this paper, a particle swarm optimization (PSO) based TR (PSO-TR) scheme proceeding with an optimal input power back off-modulation error ratio (IBO-MER) convergence criterion is proposed to improve high power amplifier (HPA) efficiency for OFDM systems. A probabilistic analysis of TR predistribution and freedom in the frequency domain, in relationship with the amplitude of its constituent samples, is carried out. This yields the theoretical framework employed in design of the proposed high computing-enhanced solutions. The proposed PSO-TR essentially make the frequency domain distribution and operation itself adaptive, that is, it adjusts to comply with the changing HPA efficiency and redundant cost during application runtime.

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“…The main limitation of phosphor-coated white LEDs for data transmission is their small modulation bandwidth: they usually have a

dB frequency of a few MHz [ 2 , 3 ]. Therefore, to reach data rates of hundreds of Mb/s, as will be required in future data networks, it is necessary to develop advanced data transmission techniques, such as advanced modulations [ 4 , 5 , 6 ], multiple access techniques [ 7 , 8 , 9 ], LED non-linearity compensation [ 10 , 11 ] or the use of multiple LEDs for transmission [ 12 , 13 ]. Any new proposal, after being analytically developed and evaluated, requires validation with experimental measurements in a real VLC setup [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Model and Methodology to Characterize Phosphor-Based White LED Visible Light Communication Links

Salvador

Almenar

Corral

et al. 2023

Sensors

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LED lighting has become the standard solution for illumination purposes thanks to its energy efficiency. Nowadays, there is growing interest in the use of LEDs for data transmission to develop future-generation communication systems. The low cost and widespread deployment of phosphor-based white LEDs make them the best candidate for visible light communications (VLC), although they have a limited modulation bandwidth. This paper presents a simulation model of a VLC link based on phosphor-based white LEDs and a method to characterize the VLC setup used to perform the data transmission experiments. Specifically, the simulation model incorporates the frequency response of the LED, the noise levels coming from the lighting source and the acquisition electronics, and the attenuation due to both the propagation channel and the angular misalignment between the lighting source and the photoreceiver. In order to validate the suitability of the model for VLC, carrierless amplitude phase (CAP) and orthogonal frequency division multiplexing (OFDM) modulation signals were employed for data transmission, and simulations with the proposed model and measurements over the equivalent scenario show high agreement.

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Energy- and Spectral- Efficiency Tradeoff in Nonlinear OFDM System of Visible Light Communications

Cited by 7 publications

References 42 publications

Continuous unconstrained PSO‐PTS strategy to maximize HPA energy efficiency for FBMC‐OQAM systems

Continuous unconstrained PSO‐PTS strategy to maximize HPA energy efficiency for FBMC‐OQAM systems

Hybrid Energy Efficiency Friendly Frequency Domain TR Algorithm Based on PSO Algorithm Evaluated by Novel Maximizing HPA Efficiency Evaluation Criteria

Model and Methodology to Characterize Phosphor-Based White LED Visible Light Communication Links

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