Energy-Spectral Efficiency Tradeoff in DCO-OFDM Visible Light Communication System

Hei, Yongqiang; Kou, Y. N.; Shi, Guangming; Li, Wentao; Gu, Huaxi

doi:10.1109/tvt.2019.2934132

Cited by 20 publications

(16 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This shows that the gain from the linear increment in the electrical bandwidth is not sufficient to compensate for the distortion of signal power beyond this optimum point. However, in Method 2, the capacity increases as bias current increases until the optimum bias point is 33.7 mA (Numerical solution of (14) gives a solution of 33.5 mA). Both approaches record identical maximum capacity for the parameters used.…”

Section: A Simulation Resultsmentioning

confidence: 99%

“…Thus, to minimise the effect of nonlinearity distortion on VLC systems, the data carrying signal should be within the linear dynamic range of the LED [13]. This is usually achieved by biasing the LED at the mid-point of its dynamic range [14]. In this work, we explore two different approaches of choosing the DC bias (operating) point.…”

Section: System Designmentioning

confidence: 99%

“…The authors are unaware of a closed-form analytical solution to (14). However, a solution can be obtained with root-finding numerical methods.…”

Section: B Bias Point Optimisationmentioning

confidence: 99%

See 2 more Smart Citations

Bias Point Optimisation in LiFi for Capacity Enhancement

Gutema

Haas

Popoola

2021

J. Lightwave Technol.

View full text Add to dashboard Cite

In this paper, we investigate methods to optimise the bias point of an LED to benefit from increasing bandwidth at higher driving current while minimising the resulting signal distortion. The approaches are based on allowing for some nonlinear distortion or to reduce signal swing/signal-to-noise ratio while benefiting from higher bandwidth at higher driving currents. A framework is presented to estimate the attainable capacity under both conditions. We also experimentally validate the optimisation with a PAM-4 based VLC system. The experimental results show that for a 40 mA dynamic range VLMB1500 LED used, the optimum bias point is not in the middle of the dynamic range but at 31 mA.

show abstract

Section: A Simulation Resultsmentioning

confidence: 99%

Section: System Designmentioning

confidence: 99%

See 1 more Smart Citation

Bias Point Optimisation in LiFi for Capacity Enhancement

Gutema

Haas

Popoola

2021

J. Lightwave Technol.

View full text Add to dashboard Cite

show abstract

“…Note that the objective function (30) is concave over p i , and constraints (28b) and (28c) are affine functions over p i . This type of optimization problem can be efficiently solved based on the KKT conditions.…”

Section: B Se Maximization Based On R Ftotal ({P I })mentioning

confidence: 99%

Spectral and Energy Efficiency of DCO-OFDM in Visible Light Communication Systems with Finite-Alphabet Inputs

Yang,

Ma,

et al. 2022

Preprint

View full text Add to dashboard Cite

The bound of the information transmission rate of direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) for visible light communication (VLC) with finite-alphabet inputs is yet unknown, where the corresponding spectral efficiency (SE) and energy efficiency (EE) stems out as the open research problems. In this paper, we derive the exact achievable rate of the DCO-OFDM system with finitealphabet inputs for the first time. Furthermore, we investigate SE maximization problems of the DCO-OFDM system subject to both electrical and optical power constraints. By exploiting the relationship between the mutual information and the minimum mean-squared error, we propose a multi-level mercury-waterfilling power allocation scheme to achieve the maximum SE. Moreover, the EE maximization problems of the DCO-OFDM system are studied, and the Dinkelbach-type power allocation scheme is developed for the maximum EE. Numerical results verify the effectiveness of the proposed theories and power allocation schemes.

show abstract

“…Earlier literatures demonstrate many works on RF and OOFDM. For instance, a direct current‐biased optical OFDM (DCO‐OFDM) has high peak‐to‐average‐power ratio (PAPR) as a result of overlapping subcarriers by the course of inverse fast Fourier transform (IFFT) [10, 11]. There are many techniques to minimise PAPR for example, clipping with filtering [12], selected mapping (SLM) [13, 14], partial transmit sequences (PTS) [15], discrete Fourier transform (DFT) precoding [16], and companding [17, 18].…”

Section: Introductionmentioning

confidence: 99%