Experimental Demonstration of High-Speed 4 × 4 Imaging Multi-CAP MIMO Visible Light Communications

Werfli, Khald; Chvojka, Petr; Ghassemlooy, Zabih; Hassan, Navid Bani; Zvánovec, Stanislav; Burton, Andrew; Haigh, Paul Anthony; Bhatnagar, Manav R.

doi:10.1109/jlt.2018.2796503

Cited by 73 publications

(57 citation statements)

References 37 publications

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“…A solution that avoids equalization complexity has recently been proposed where multiple low rate CAP symbols are transmitted through groups of LEDs using spatial modulation technique to realise high spectral efficiency [10]. The spatial modulation solution has been experimentally demonstrated to offer improved data rate and spectral efficiency without the need for equalizers [11]. The problem with the spatial approach is that it requires distinct channel gains for optimal performance and this might not be available especially for mobile VLC systems [12].…”

Section: Take Down Policymentioning

confidence: 99%

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Subband Index Carrierless Amplitude and Phase Modulation for Optical Communications

Akande

Popoola

2018

J. Lightwave Technol.

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Subband index carrierless amplitude and phase modulation (SI-CAP) is proposed and investigated in this work to improve the performance of multi-band CAP (m-CAP). The bit-error-rate (BER) analysis of the proposed SI-CAP is derived and verified through computer simulations. A detection scheme is also developed for SI-CAP which achieves maximum likelihood (ML) performance at a significantly lower complexity. In addition, an experimental demonstration of the proposed SI-CAP is carried out for optical communication systems. Furthermore, adaptive equalization technique is implemented to further enhance the performance gain of SI-CAP. It is shown that for the same order of complexity, the SI-CAP exhibits higher spectral and energy efficiency in comparison to m-CAP. Therefore, the performance gain of SI-CAP along with its design flexibility make it a suitable candidate for optical communication systems. Index Terms-Multi-band carrierless amplitude and phase modulation (m-CAP), optical communication, visible light communication (VLC), index modulation (IM), step-index plastic optical fibre (SI-POF), adaptive equalization. I. INTRODUCTION There is an ever increasing demand for high speed data connection due to unprecedented growth in broadband communication and the expected ubiquitous connectivity of smart devices. This demand requires communication technologies that can support the existing overcrowded radio frequency (RF) communication to meet the future data traffic. Optical communication is one of such techniques as it offers huge spectrum with low cost devices [1]. Step-index plastic optical fibre (SI-POF) has received high interest in optical communication due to its low cost, ease of installation and resilience to electromagnetic interference [2]. In addition, visible light communication (VLC) has become an emerging technology in the field of optical wireless communication (OWC) [3]. The VLC can leverage existing lighting fixtures for data communication and its benefits include the use of low-cost devices, availability of huge spectrum and high security, among others [3], [4]. The commercially available white light emitting diodes (LEDs) that are predominantly employed for illumination and VLC have small modulation bandwidth and creates a bottleneck in achieving high data rate. Furthermore, high data rate transmission over SI-POF results in inter-symbol interference (ISI) due to its limited bandwidth-length product, typically 45 MHz × 100 m.

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Section: Take Down Policymentioning

confidence: 99%

“…Multiple subband CAP, m-CAP, is generated by modulating unique log 2 (M) bits on each of the N subbands of an m-CAP signal [11], [15]. For each subband, the data bits are first mapped to corresponding M-QAM symbol and subsequently upsampled.…”

Section: A System Description Of M-capmentioning

confidence: 99%

Subband Index Carrierless Amplitude and Phase Modulation for Optical Communications

Akande

Popoola

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: 97%

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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“…Its limited transmission range can alleviate the interference issue and can lead to ultra-dense transmitter and receiver deployment. Current research into visible light communication includes the experimental demonstration of high-speed communication systems [1,2], beamforming optimization [3], the physical-layer secrecy problem [4], and multi-user coverage [5].…”

Section: Introductionmentioning

confidence: 99%