Variable m-CAP for bandlimited Visible Light Communications

Chvojka, Petr; Zvánovec, Stanislav; Werfli, Khald; Haigh, Paul Anthony; Ghassemlooy, Zabih

doi:10.1109/iccw.2017.7962624

Cited by 11 publications

(12 citation statements)

References 13 publications

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“…The m-CAP scheme has been widely adopted in VLC systems [9][10][11][12][13][14] and has subsequently been demonstrated in many new methods. In a generic formulation of m-CAP such as in [6], each sub-band has an equivalent bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…In a generic formulation of m-CAP such as in [6], each sub-band has an equivalent bandwidth. Considering B LE D and B C AP are independent, and very often in VLC B C AP > B LE D [15], a number of m-CAP schemes have been proposed that vary the individual sub-band bandwidths according to these two quantities [9,11]. In [9], it was proposed to maintain the condition B C AP > B LE D and divide m sub-bands into two categories; (i) those within a DC-B LE D frequency range; and (ii) those beyond B LE D .…”

Section: Introductionmentioning

confidence: 99%

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Visible light communications: multi-band super-Nyquist CAP modulation

Haigh¹,

Chvojka²,

Ghassemlooy³

et al. 2019

Opt. Express

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In this paper, we experimentally demonstrate the performance of a non-orthogonal multi-band super-Nyquist carrier-less amplitude and phase (m-SCAP) modulation for visible light communications (VLC). We break the orthogonality between sub-bands in the frequency domain by compressing the spectrum, purposely overlapping them, and introducing inter-band interference (IBI). We demonstrate that our proposed system can tolerate IBI, and hence spectral efficiency can be increased without introducing additional complexity to the receiver. We show that m-SCAP can tolerate up to 30% and 20% compression for 4-and 16-level quadrature amplitude modulation, respectively, thus leading to an improvement in spectral efficiencies up to 40% and 25%, respectively, at the cost of bit error rate performance, which however remains below the 7% forward error correction limit. Moreover, the experimental results are supported by numerical simulations. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible light communications: multi-band super-Nyquist CAP modulation

Haigh¹,

Chvojka²,

Ghassemlooy³

et al. 2019

Opt. Express

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“…In m-CAP the signal bandwidth is split into several subcarriers, where the attenuation caused by an LED frequency response is decreased. Therefore VLC links by allocating different bandwidths for individual subcarriers, with high s (i.e., up to 36% improvement in Rb for 6-CAP) can be supported [44]. The first VLC experiment utilizing m-CAP was reported in [43] with Rb of 31.5 Mb/s using Fig.…”

Section: Modulation Schemesmentioning

confidence: 99%

A Survey on Recent Advances in Organic Visible Light Communications

Chaleshtori

Chvojka

Zvánovec

et al. 2018

2018 11th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP)

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Visible light communication (VLC) employs light emitting diodes (LEDs) to provide illumination and data communications simultaneously. Organic LEDs (OLEDs) employing small molecules and long-chain polymers PLEDs, have been gaining attention within the VLC research community due to their inherent advantages such as flexible substrates and low-cost manufacturing. However, the carrier mobility of organic semiconductors is much slower than the devices composed of metal alloys, such as gallium nitride, thus leading to a restriction in the OLED modulation bandwidth. The manufacturing processes, materials and the photoactive size of the devices can affect the raw bandwidth of OLEDs. To increase the transmission speeds, novel approaches have been proposed including equalization techniques, signalling schemes and the optimum driver circuits. The paper provides a survey on the evolution of OLED-based VLC systems, and the respective challenges and recent progresses.

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“…Normally, the sub-carriers are distributed evenly within the Btot in m-CAP. However, the unequal sub-carrier distribution introduces additional performance improvements as demonstrated in [26,27]. In comparison to conventional m-CAP, allocating the entire LED modulation bandwidth to the 1 st sub-carrier while the rest of sub-carriers are split equally over the remaining Btot (i.e., outside the LED modulation bandwidth) results in: (i) decreased computational complexity by reducing the number of FIR filters by 80%, 75%, 67% and 50% for m = 10, 8, 6, and 4, respectively [26], which is significant; and (ii) improved achievable data rates by up to 36% for m = 6, see Fig.…”

Section: A Theoretical Studiesmentioning

confidence: 99%

“…The comparison of the predicted total bit rates against the bit energy to noise ratio (Eb/N0) for conventional and variable 6-CAP schemes[27].…”

mentioning

confidence: 99%

Multi-band carrier-less amplitude and phase modulation for VLC: An overview

Chvojka

Werfli

Haigh

et al. 2017

2017 First South American Colloquium on Visible Light Communications (SACVLC)

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The rapid development of solid-state lighting technologies has been the stimulus for visible light communications (VLC) to be the focus of enormous interest over the last decade. The key feature of simultaneous data transmission and illumination using white light-emitting diodes (LEDs) makes VLC a potential candidate for future power efficient communication networks that aim to meet the ever-increasing demands for high-speed internet services. Researchers, motivated by the success of VLC technology, have developed a number of techniques and methods to support communication systems with both high transmission speeds and spectral efficiency. Here, we provide an overview of the multi-band carrier-less amplitude and phase (m-CAP) modulation technique enabling highly spectrally efficient VLC links in bandlimited environments. Index Terms-multi-band carrier-less amplitude and phase modulation, spectral efficiency, visible light communications I. INTRODUCTION HE existing radio frequency (RF) based wireless communication technologies cannot cope with the increasing demands for high-speed data traffic, which is expected to grow sevenfold between 2016 and 2017 [1]. The commercially available RF spectrum has already been exhausted, thus leading to the spectrum crunch that needs urgent attention. There are a number of possible options to address this problem including allocation of new spectra, which is highly expensive, spectrum hoping, sharing and borrowing, advanced modulation and coding schemes, interference elimination, and parallel transmission. Alternatively, the carrier frequency could be shifted to the optical domain i.e., optical wireless communications (OWC), which covers the three main bands of visible, infrared and ultraviolet, thus offering an alternative solution for future broadband services in indoor and outdoor environments [2]. The infrared and ultraviolet bands are mostly used in outdoor applications for line-of-sight (LOS) and non-LOS links, whereas the visible band has been widely adopted in the indoor environment [3]. As a part of OWC, visible light communications (VLC) has been the focus of enormous attention due to a few key advantages including (i) high and unregulated bandwidth (in the order of THz);

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Variable m-CAP for bandlimited Visible Light Communications

Cited by 11 publications

References 13 publications

Visible light communications: multi-band super-Nyquist CAP modulation

Visible light communications: multi-band super-Nyquist CAP modulation

A Survey on Recent Advances in Organic Visible Light Communications

Multi-band carrier-less amplitude and phase modulation for VLC: An overview

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