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Distance-Range-Oriented Constellation Design for VLC-SCMA Downlink with Signal-dependent Noise
摘要： In this paper, the constellation design for a sparse code multiple access (SCMA) based visible light communication (VLC) downlink is studied. The noise at the receiving avalanche photodiode (APD) is dependent on the signal intensity, and the associated design problems are typically intractable. We point out that for such a system both the minimum Euclidean distance (MED) and Rotated-MED based methods are not the optimal optimization objective, and propose a distance-range-oriented (DRO) modulation, where a linear combination of the minimum and maximum Euclidean distance is considered. We observe in the simulation results that the proposed DRO-based scheme outperform the MED and Rotated-MED based ones across a wide range of signal and noise levels.
关键词： distance range,signal-dependent noise,Constellation design,SCMA,visible light communication
更新于2025-09-23 15:22:29
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[IEEE 2019 IEEE International Symposium on Information Theory (ISIT) - Paris, France (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Information Theory (ISIT) - A Variational Signal-Space Distance Measure for Nondispersive Optical Fiber
摘要： The nondispersive per-sample channel model for the optical fiber channel is considered. Under some smoothness assumptions, the problem of finding the minimum amount of noise energy that can render two different input points indistinguishable is formulated. The necessary conditions for the noise trajectory that has the minimum energy are described as a system of nonlinear differential equations. It is suggested that this model can be generalized to consider dispersion and to design new communication schemes for fiber-optic communication systems.
关键词： variational approach,optical fiber,constellation design,adversarial model
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - St. Petersburg, Russia (2019.10.17-2019.10.18)] 2019 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Scaling QAM Technique for LED-based Visible Light Communication System with Signal-related Noise
摘要： We propose a scaling QAM technique considering the signal-related noise in a practical VLC system. Experiments are performed and the results indicate that the proposed scaling QAM can improve the performance of VLC system signi?cantly.
关键词： constellation design,visible light communication,signal-related noise
更新于2025-09-12 10:27:22
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Approach in companding-quantisation-inspired PAM constellation design
摘要： In this study, a very simple but successful method for designing the pulse-amplitude modulation (PAM) constellations with non-equiprobable symbols and not equally spaced amplitudes is presented. The method, inspired by companding quantisation, introduces a constellation design function having a feature that maps the non-uniformly distributed constellations points into uniform ones. In particular, two classes of piecewise-linear constellation design function having two segments are provided. In PAM constellation designed by the proposed method, the set of constellation points is divided into two uniform subsets. Each of these subsets is characterised by a certain probability of constellation points and by a constant distance between adjacent points. For this model of PAM constellation, the formulas that enable the elegant assessment of the signal energy and the symbol error probability are derived. Results obtained analytically and verified through simulations show that, in terms of the symbol error probability, the proposed PAM constellations outperforms conventional uniform PAM constellation as well as the other models of piecewise-uniform PAM constellations.
关键词： PAM constellations,non-equiprobable symbols,symbol error probability,piecewise-linear constellation design function,companding quantisation
更新于2025-09-10 09:29:36