Frequency Domain Equalization and Post Distortion for LED Communications With Orthogonal Polynomial Based Joint LED Nonlinearity and Channel Estimation

Zhao, Weikang; Guo, Qinghua; Tong, Jun; Xi, Jiangtao; Yu, Yanguang; Niu, Pingjuan

doi:10.1109/jphot.2018.2848655

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…Fig. 9 also shows the performance of the receiver which employs the frequency domain equalization (FDE) to compensate the memory effect and the conventional polynomial inverse technique to mitigate the nonlinear distortion of LED (denoted by 'FDE+InvPoly') [28], where nonlinearity and memory are assumed to be perfectly known. It can be seen that the receiver does not work well.…”

Section: Resultsmentioning

confidence: 99%

Extreme-Learning-Machine-Based Noniterative and Iterative Nonlinearity Mitigation for LED Communication Systems

Gao

Guo

Tong

et al. 2020

IEEE Systems Journal

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This work concerns receiver design for light emitting diode (LED) communications where the LED nonlinearity can severely degrade the performance of communications. We propose extreme learning machine (ELM) based non-iterative receivers and iterative receivers to effectively handle the LED nonlinearity and memory effects. For the iterative receiver design, we also develop a data-aided receiver, where data is used as virtual training sequence in ELM training. It is shown that the ELM based receivers significantly outperform conventional polynomial based receivers; iterative receivers can achieve huge performance gain compared to non-iterative receivers; and the data-aided receiver can reduce training overhead considerably. This work can also be extended to radio frequency communications, e.g., to deal with the nonlinearity of power amplifiers.

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Section: Resultsmentioning

confidence: 99%

Extreme-Learning-Machine-Based Noniterative and Iterative Nonlinearity Mitigation for LED Communication Systems

Gao

Guo

Tong

et al. 2020

IEEE Systems Journal

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“…where A r is active area of the photodiode and c is the light speed in the free space. [53][54][55] T s (ψ) and g(ψ) are the gain of an optical band-pass filter and a non-imaging concentrator for the photodiode, respectively. dt d c ( ) represents the signal propagation delay through the Dirac delta function δ ( ).…”

Section: Interference and Dispersion In Multipath Fading Channelsmentioning

confidence: 99%

“…The Lambert's mode number m indicates directivity of the source light beam which relates to the semi-angle at halfpower of LED. [53][54][55] As for the non-LOS link, the transmission signals subject to the effects of multipath fading propagation. Thus, the DC gain of the signal for the receiver is calculated via the multiple reflections at a room.…”

Section: Interference and Dispersion In Multipath Fading Channelsmentioning

confidence: 99%

“…The ρ j is the reflection coefficient of j-th reflection element, and d S j is the distance from LED to j-th reflector. [53][54][55] Using the parameters given in Table I, the model of this typical indoor VLC system is applicable for the simulation of channel impulse response, and it does not take account of shadowing and furniture layout. Figure 5 shows the impulse responses and frequency responses of the LOS and non-LOS links, which indicate that the multipath propagation of the VLC channel is frequency selective fading.…”

Section: Interference and Dispersion In Multipath Fading Channelsmentioning

confidence: 99%

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Nonlinear compensation for indoor visible light communication systems with carrierless amplitude and phase modulation

Chen¹,

Kuboki²,

Kato³

2019

Jpn. J. Appl. Phys.

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Although there are enormous available bandwidths for license-free visible light communication (VLC), a relatively narrow modulation bandwidth of LED is still an obstacle for further application. The carrierless amplitude and phase (CAP) modulation is a high spectral efficiency modulation technology which has begun to draw more attention in recent years. However, to meet the illumination of indoor VLC, the nonlinear interference is quite serious because of multipath fading channels. Thus, the spectrum efficiency of VLC with CAP modulation is greatly limited by these nonlinear effects. In this paper, the nonlinear distortion of indoor VLC systems, which was introduced by the nonlinearity of analog device and multipath fading channel, has been analyzed. Therefore, the problem we are trying to solve is to study an adaptive digital equalizer at CAP modulation which can efficiently mitigate nonlinearity of indoor VLC. The simulation result shows that the adaptive digital decision-feedback equalizer is an effective solution that can mitigate inter-symbol interference and improve the receiver performance efficiently.

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Sparse Channel Estimation With Distorted Signals for UWB OFDM Systems

Wang

Liu³

et al. 2023

IEEE Wireless Commun. Lett.

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Frequency Domain Equalization and Post Distortion for LED Communications With Orthogonal Polynomial Based Joint LED Nonlinearity and Channel Estimation

Cited by 5 publications

References 27 publications

Extreme-Learning-Machine-Based Noniterative and Iterative Nonlinearity Mitigation for LED Communication Systems

Extreme-Learning-Machine-Based Noniterative and Iterative Nonlinearity Mitigation for LED Communication Systems

Nonlinear compensation for indoor visible light communication systems with carrierless amplitude and phase modulation

Sparse Channel Estimation With Distorted Signals for UWB OFDM Systems

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