Energy-Constrained Slot-Amplitude Modulation With Dimming Support

Bui, Thai-Chien; Singh, Ravinder; O’Farrell, T.; Biagi, Mauro

doi:10.1109/lpt.2018.2845670

Cited by 8 publications

(7 citation statements)

References 10 publications

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“…For each LED, K (γ, L s , M ) is the number of combinations of amplitudes [8] that meet the above constraint (3), and can be calculated as…”

Section: System Modelmentioning

confidence: 99%

“…However, PPM requires higher bandwidth and complexity in comparison with OOK. In terms of improved modulation techniques for single-input single-output (SISO) VLC systems, a multi-level pulse position scheme called energy-constrained slot-amplitude modulation (ECSAM) has been proposed [8]. A main advantage of ECSAM is that it can provide dimming and flicker-free modulation with fixed average transmission power.…”

Section: Introductionmentioning

confidence: 99%

“…To fully maintain stable and realistic illumination, modulation and coding technologies in MIMO VLC systems should maintain some critical lighting-related features such as flicker mitigation, dimming support, and uniform illumination. Even though ECSAM [8] can provide strong dimming capability and flicker-free modulation for a VLC system, this scheme is restricted to the SISO case. The authors in [18] proposed a coding scheme for uniform illumination in MIMO VLC systems.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we propose a novel system, namely enhanced multi-level multi-pulse modulation (EMMM), which provides flicker-free, uniform illumination with dimming control capability during each symbol for MIMO VLC systems. Specifically, the flicker-free condition is provided by ensuring constant total transmitted power during each symbol, where symbol length is defined to be less than the human eye's integrating time [8]. The uniform illumination condition is achieved by equating total power among LEDs.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Multi-Level Multi-Pulse Modulation for MIMO Visible Light Communication

Tran

Kim

2020

IEEE Access

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Any realistic indoor multiple-input multiple-output (MIMO) visible light communication (VLC) system, besides providing reliable high rate transmission, should also support flicker-free, dimming capable, and uniform illumination. In this paper, we propose a multi-level multi-pulse modulation for a MIMO VLC system to provide a high data rate with flicker-free uniform illumination. A low complexity detector and a searching algorithm to design the symbol set for transmission are also discussed. Simulation results demonstrate that the proposed detector can achieve a remarkable reduction in computational complexity without any performance degradation as compared with the conventional maximum likelihood detector. Moreover, the proposed symbols design algorithm can help to reduce the symbol error rate (SER), especially in high correlation MIMO VLC channels. INDEX TERMS Visible light communication (VLC), multiple-input multiple-output (MIMO), pulse modulation, sphere detector (SD).

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“…For each LED, K (γ, L s , M ) is the number of combinations of amplitudes [8] that meet the above constraint (3), and can be calculated as…”

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Multi-Level Multi-Pulse Modulation for MIMO Visible Light Communication

Tran

Kim

2020

IEEE Access

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“…Recently, the authors proposed a novel VLC modulation scheme named energy-constrained slot-amplitude modulation (ECSAM) [15] such that both the flicker and dimming issues can be resolved by considering an energy constraint within the duration/period of every macro-symbol, which consists of multiple amplitude modulated slots, referred to as micro-symbols. ECSAM controls both time and amplitude dimensions, which can be interpreted as a smart merger of amplitude (e.g.…”

Section: Introductionmentioning

confidence: 99%

Optical Energy-Constrained Slot-Amplitude Modulation for Dimmable VLC: Suboptimal Detection and Performance Evaluation

Bui

Singh

O’Farrell

et al. 2021

IEEE Trans. Wireless Commun.

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Energy-constrained slot-amplitude modulation (ECSAM) enables light dimming, eliminates light flicker and constrains the peak optical power while providing robust communication links. However, the complexity of the maximum-likelihood (ML) based ECSAM receiver increases exponentially with required spectral efficiency. This paper provides a comprehensive performance evaluation of ECSAM for the indoor visible light communication (VLC) channel with multipath propagation under realistic illumination constraints and imperfect channel estimation. A sub-optimal receiver that employs a slot-byslot detection algorithm followed by a slot-correction mechanism for reducing the receiver complexity is proposed. Additionally, the method for optimal selection of parameters when designing the signal waveform is presented. The analytical upper bound on the symbol error rate of ECSAM is derived using the union-bound technique. The results show that the error performance of the sub-optimal receiver are comparable to that of the optimal ML receiver. Compared with conventional power or bandwidth efficient VLC modulation techniques such as multiple pulse position modulation (MPPM) and pulse amplitude modulation (PAM), ECSAM provides complete flexibility in modifying the signal constellation for a desired dimming level to maximise the spectral efficiency and provide a robust bit error rate performance especially in the multipath propagation channel induced intersymbol interference.

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