On the m-CAP Performance with Different Pulse Shaping Filters Parameters for Visible Light Communications

Chvojka, Petr; Werfli, Khald; Zvánovec, Stanislav; Haigh, Paul Anthony; Vacek, V.; Dvořák, Petr; Pešek, Petr; Ghassemlooy, Zabih

doi:10.1109/jphot.2017.2749203

Cited by 29 publications

(36 citation statements)

References 24 publications

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“…Both p(t) and p (t) have a finite filter length L s . As has been shown in the literature [13,16], the effect of L s can have a significant impact on the bit-error rate (BER) performance. As a result, we select several different values of L s as described later in the section.…”

Section: Test Setupmentioning

confidence: 94%

“…[18]), we elected not to extend the bandwidth of the proposed system as we do not consider the impact of band-limitations in this work and as such, the overall data rate is not the focus of this work and can be set arbitrarily. Hence, we set the signal bandwidth to 1 MHz in order to ensure operation within the pseudoflat portion of the system magnitude response and enable demodulation via a low-pass filter (LPF), in a similar manner to our previous work [13]. The reason that we opt against targeting a high transmission speed in this test is to investigate the performance of the proposed pulse shapes when adopted in non-band-limited VLC links.…”

Section: Test Setupmentioning

confidence: 99%

“…The Xia pulse is asymmetrical, where more energy exists before the peak than after it, whilst still satisfying the Nyquist first criterion for zero ISI [10]. This introduces an interesting characteristic because the FIR filters adopted in a digital implementation of CAP are computationally demanding as the number of operations increases linearly with the filter length and this has an impact on the link BER performance [12,13]. Thus, if asymmetrical clipping of the filter could be achieved without a significant impact on the BER performance, this would be advantageous.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of Nyquist Pulse Shapes for Carrierless Amplitude and Phase Modulation in Visible Light Communications

Haigh

Chvojka

Zvánovec

et al. 2018

J. Lightwave Technol.

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Abstract-This paper proposes and experimentally demonstrates, for the first time, two new candidate pulse shapes for carrier-less amplitude and phase modulation in the context of visible light communications. It is commonly accepted that the pulse shape at the heart of the Hilbert pair used to generate the required orthogonal signal spaces should be the square-root raised cosine. In this work, we introduce two additional candidate pulse shapes, namely the first-order Xia pulse and the socalled better-than-Nyquist pulse. We demonstrate experimentally that the better-than-Nyquist pulse offers superior bit-error rate performance compared to the square-root raised cosine and Xia pulses under additive white Gaussian noise channel conditions, whilst offering lower computational complexity.

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Section: Test Setupmentioning

confidence: 94%

Section: Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Nyquist Pulse Shapes for Carrierless Amplitude and Phase Modulation in Visible Light Communications

Haigh

Chvojka

Zvánovec

et al. 2018

J. Lightwave Technol.

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“…In [13,14], another approach for improving the VLC link capacity/spectral efficiency was introduced by applying unequally spaced subcarriers. The most recent works have reported transmission speed and spectral efficiency up to ~250 Mb/s [15] and ~6 b/s/Hz [12], respectively, thus providing sufficient headroom for further improvement in VLC systems as reported based on numerical simulations in [16].…”

Section: Introductionmentioning

confidence: 96%

Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC Systems

Haigh

Chvojka

Ghassemlooy

et al. 2018

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

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In this work we propose and experimentally demonstrate a novel non-orthogonal multi-band carrier-less amplitude and phase (NM-CAP) scheme for bandlimited visible light communication systems in order to increase the spectral efficiency. We show that a bandwidth saving up to 30% can be achieved thus resulting in 44% improvement in the measured spectral efficiency with no further bit error rate performance degradation compared to the traditional m-CAP scheme. We also show that higher order systems can provide higher bandwidth compression than low order systems. Furthermore, with no additional functional blocks at the transmitter or the receiver the proposed scheme introduces no extra computational complexity. Keywords-multi-band carrier-less amplitude and phase modulation; non-orthogonal; visible light communications

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“…Recent progress has seen CAP implemented as a multiband scheme (m-CAP) with improved tolerance towards the non-linearity effect of the VLC channel [9,10]. The improved performance of m-CAP has also been experimentally verified and demonstrated for VLC links [11].…”

Section: Introductionmentioning

confidence: 99%

Spatial Carrierless Amplitude and Phase Modulation Technique for Visible Light Communication Systems

Akande

Popoola

2019

IEEE Systems Journal

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Spatial carrierless amplitude and phase modulation (S-CAP) technique is developed in this paper as a physical layer solution to improve the spectral efficiency of the conventional CAP scheme while preserving its low complexity transceiver design. The S-CAP technique is proposed and investigated for systems employing the visible light communication (VLC) technology. An analytical expression for the joint detection of the spatial and signal bits for the user equipment (UE) experiencing line-of-sight propagation (LOS) is derived and validated via simulation. The effect of multipath propagation and user mobility on the bit-error-rate (BER) performance of the proposed S-CAP are also investigated. It is found that the (BER) performance of S-CAP in LOS is dictated by the minimum of the channel gains h min , the signal constellation points (SCP) and the channel gain dissimilarity, ∆|h|. The power factor imbalance (PFI) and multiple photodetectors (PDs) are then introduced to improve performance and mitigate channel impairments. The use of PFI and PDs in LOS result in signal-to-noise (SNR) gain of 33.5 dB and 43 dB, respectively. The proposed scheme is thus a novel implementation of CAP in a multiple-input multiple-output (MIMO) system and demonstrates its potential as a suitable physical layer solution for VLC technology.

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On the m-CAP Performance with Different Pulse Shaping Filters Parameters for Visible Light Communications

Cited by 29 publications

References 24 publications

Analysis of Nyquist Pulse Shapes for Carrierless Amplitude and Phase Modulation in Visible Light Communications

Analysis of Nyquist Pulse Shapes for Carrierless Amplitude and Phase Modulation in Visible Light Communications

Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC Systems

Spatial Carrierless Amplitude and Phase Modulation Technique for Visible Light Communication Systems

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