Experimental multi-user VLC system using non-orthogonal multi-band CAP modulation

Pešek, Petr; Haigh, Paul Anthony; Younus, Othman Isam; Chvojka, Petr; Ghassemlooy, Zabih; Zvánovec, Stanislav

doi:10.1364/oe.393813

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…To show the specific numerical computational complexity, parameters in (12) are set according to the experimental results that will be described later in this paper. When α = 0.2, we let β = 0.1, L = 8, K = 2 14 , δ = 0.41, L LMS = 31 and iter = 50. When α = 0.5, we let β = 0.2, L = 4, K = 2 14 , δ = 0.34, L LMS = 31 and iter = 50.…”

Section: Computational Complexitymentioning

confidence: 99%

“…When α = 0.2, we let β = 0.1, L = 8, K = 2 14 , δ = 0.41, L LMS = 31 and iter = 50. When α = 0.5, we let β = 0.2, L = 4, K = 2 14 , δ = 0.34, L LMS = 31 and iter = 50. Based on those parameters, the relationship between computational complexity and number of NM-CAP sub-bands is plotted in Fig.…”

Section: Computational Complexitymentioning

confidence: 99%

“…Haigh et al proposed a non-orthogonal m-CAP (NM-CAP) based on modification of the subcarrier frequencies to force compression of adjacent sub-bands [13]. In [14], a multi-user NM-CAP VLC system was reported by adjusting the overlapping of each sub-band and allocating different bandwidths to each sub-band.…”

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confidence: 99%

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Neural Network Detection for Bandwidth-Limited Non-Orthogonal Multiband CAP UVLC System

et al. 2022

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In this paper, we propose a novel sparse data-tosymbol neural network (SDSNN) receiver for bandwidth-limited underwater visible light communication (UVLC) based on nonorthogonal multi-band carrierless amplitude and phase modulation (NM-CAP). Bandwidth limited NM-CAP signals usually carry severe inter-symbol interference (ISI) and inter-band interference (IBI). The SDSNN receiver directly converts the received NM-CAP data with ISI and IBI into quadrature amplitude modulation symbols without distortion for each sub-band. In contrast, the conventional receiver requires the least mean square (LMS) equalizer to cancel ISI, and the subcarrier component extraction with complex independent component analysis (SCE-ICA) to cancel IBI, respectively. SDSNN provides a novel receiving structure to replace postequalization, matched filtering, and SCE-ICA. A blue-LED based UVLC system has been demonstrated utilizing NM-CAP16 with 3 sub-bands. The experimental results show that NM-CAP with the SDSNN receiver case reaches the highest spectral efficiency, where an enhancement of 43%, 20%, 6% has been measured over the orthogonal multi-band CAP case, NM-CAP with LMS equalizer case, and NM-CAP with joint LMS equalizer and SCE-ICA case, respectively. Compared with joint LMS equalizer and SCE-ICA case, the proposed SDSNN receiver can achieve 98% reduction of computational complexity.

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Section: Computational Complexitymentioning

confidence: 99%

Section: Computational Complexitymentioning

confidence: 99%

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Neural Network Detection for Bandwidth-Limited Non-Orthogonal Multiband CAP UVLC System

et al. 2022

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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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“…In [14], a MA multi-band carrierless-amplitude-and-phase modulation (m-CAP) was considered for multi-user VLC links. The practical implementation of MA non-orthogonal m-CAP in the context of multi-user VLC links was also considered in [15]. In the context of WBANs, [16] and [6], [7] studied the use of optical CDMA for intra-and extra-WBAN connectivity, respectively.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Multiple Access m-CAP for Optical-Based Intra-WBAN Links

Haddad

Khalighi

Ghassemlooy

et al. 2022

2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

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Optical-based wireless body area networks (WBANs) are a promising solution for remote monitoring of vital signs in radio-frequency sensitive environments such as healthcare facilities. When dealing with a large number of sensors coexisting within the same vicinity, multiple access (MA) solutions are necessary to manage the simultaneous access to the medium. In this paper, we investigate the use of MA multi-band carrierless amplitude and phase (m-CAP) for intra-WBAN links. Using the outage probability criterion, we evaluate the performance of such a solution while accounting for realistic statistical channel models. Furthermore, we study the impact of system parameters such as bandwidth, number of sub-bands, and roll-off factor on the link performance.

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Experimental multi-user VLC system using non-orthogonal multi-band CAP modulation

Cited by 6 publications

References 30 publications

Neural Network Detection for Bandwidth-Limited Non-Orthogonal Multiband CAP UVLC System

Neural Network Detection for Bandwidth-Limited Non-Orthogonal Multiband CAP UVLC System

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

Performance Analysis of Multiple Access m-CAP for Optical-Based Intra-WBAN Links

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