Multi-band carrier-less amplitude and phase modulation for highly bandlimited visible light communications &amp;#x2014; Invited paper

Haigh, Paul Anthony; Aguado, Alejandro; Ghassemlooy, Zabih; Chvojka, Petr; Werfli, Khald; Zvánovec, Stanislav; Ertunc, Ezgi; Kanesan, Thavamaran

doi:10.1109/wcsp.2015.7341338

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…In our system we utilize square root raised cosine (SRRC) filters with a fixed roll-off factor α that determines the excess bandwidth of the transmitted signal. The output signal modulating an LED intensity is given as [12,13]:…”

Section: A M-cap Principlementioning

confidence: 99%

“…Thus, the generated bit streams are mapped into binary phase shift keying (BPSK) symbols. After passing the LPF channel, the signal is demodulated and EVM measurement is performed to calculate the received signal to noise ratio (SNR) for each subcarrier as in line with [12]. The bit allocation for each subcarrier is performed using estimated SNR values according to the given BER target of 10 -4 , which is below the forward error correction (FEC) limit with an overhead of 7% (3.8×10 -3 ).…”

Section: B Test Setupmentioning

confidence: 99%

“…Besides OFDM, the m-CAP modulation technique has recently been the focus of extensive investigation [9][10][11][12][13][14]. The multiband form of CAP, which splits the total signal bandwidth into m equally spaced subcarriers, was developed for optical fibre communication systems, showing enhanced performance over a traditional 1-CAP in terms of bandwidth efficiency, dispersion, reduced sampling rate and slightly increased data rate [10].…”

Section: Introductionmentioning

confidence: 99%

“…Such a promising result has led to further investigation of m-CAP performance. For instance, numerical simulations of m-CAP in a highly bandlimited VLC link were reported in [12] showing 40% improvement in data rate over traditional 1-CAP technique when 10-CAP is employed. The work presented in [13] focused on the analysis of pulse shaping filters, which are important for both overall system performance and complexity that is crucial for the development of VLC systems in real environments.…”

Section: Introductionmentioning

confidence: 99%

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Variable m-CAP for bandlimited Visible Light Communications

Chvojka

Zvánovec

Werfli

et al. 2017

2017 IEEE International Conference on Communications Workshops (ICC Workshops)

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The multi-band carrier-less amplitude and phase (m-CAP) modulation technique has been demonstrated as a significant candidate for use in visible light communication (VLC) systems, as spectral efficiency becomes ever more important. When employing m-CAP modulation, the signal bandwidth is typically split into m equally distributed subcarriers regardless of the-3 dB bandwidth. Thus, in this paper we investigate the impact of splitting the signal bandwidth into unequally spaced subcarriers on the m-CAP VLC system performance. We demonstrate that by allocating different bandwidths for individual subcarriers, we can achieve up to 36% improvement in data rate for 6-CAP (i.e. 6 subcarriers). We show that the higher the order of the variable m-CAP, the more significant improvement in data rate becomes even for a highly bandlimited VLC system when compared to the conventional m-CAP scheme.

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Section: A M-cap Principlementioning

confidence: 99%

Section: B Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variable m-CAP for bandlimited Visible Light Communications

Chvojka

Zvánovec

Werfli

et al. 2017

2017 IEEE International Conference on Communications Workshops (ICC Workshops)

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“…The carrier frequencies of the individual sub-carriers are given by the frequency of a cosine/sine wave. The impulse responses for I and Q filters are given by [18,19]:…”

Section: Principle Of M-capmentioning

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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