Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth Red-Emitting Polymer-LED based Visible Light Communications

In this paper we experimentally demonstrate, for the first time, staggered carrier-less amplitude and phase (sCAP) modulation for visible light communication systems based on polymer light-emitting diodes emitting at ~639 nm. The key advantage offered by sCAP in comparison to conventional multiband CAP is its full use of the available spectrum. In this work, we compare sCAP, which utilises four orthogonal filters to generate the signal, with a conventional 4-band multi-CAP system and on-off keying (OOK). We transmit each modulation format with equal energy and present a record un-coded transmission speed of ~6 Mb/s. This represents gains of 25% and 65% over the achievable rate using 4-CAP and OOK, respectively.Comment: 6 pages, 9 figures, IEEE ICC 2019 conferenc

A Software-Defined Multi-Element VLC Architecture

In the modern era of radio frequency (RF) spectrum crunch, visible light communication (VLC) is a recent and promising alternative technology that operates at the visible light spectrum. Thanks to its unlicensed and large bandwidth, VLC can deliver high throughput, better energy efficiency, and low cost data communications. In this article, a hybrid RF/VLC architecture is considered that can simultaneously provide light- ing and communication coverage across a room. Considered architecture involves a novel multi-element hemispherical bulb design, which can transmit multiple data streams over light emitting diode (LED) modules. Simulations considering various VLC transmitter configurations and topologies show that good link quality and high spatial reuse can be maintained in typical indoor communication scenarios

Practical application of IOT and its implications on the existing software

The data management from end-to-end level is done by cloud-assisted IOT for its users and they keep a goal in increasing their number of users with the course of time. From saving the infiltration of data from both internal and external threats to the system, IOT is the best-proposed method used for securing the database. Connecting objects/individuals with the Internet via safe interaction is the main objective of IOT. It can assemble all the hardware devices that are designed to store data for an individual or an organization. The associated applications and the way in which it can be deployed in the present organization in order to optimize the current working system. This paper focuses on providing an overall systematic secured data sharing portal that is devoid of threats from internal as well as external entities. By using CIBPRE data encryption a major security reform is introduced by IOT in storing and sharing of data on a regular basis

RANCANG BANGUN PURWARUPA TONGKAT PEMANDU UNTUK TUNANETRA BERBASIS HYBRID VISIBLE LIGHT COMMUNICATION DENGAN KELUARAN SUARA

Seperti yang kita ketahui, saat ini teknologi sudah menjadi bagian hidup manusia. Berbagai inovasi di ciptakan dengan tujuan untuk mempermudah hidup manusia maupun memberikan manfaat positif lainnya, termasuk bagi penyandang tuna netra. Penyandang tuna netra memiliki keterbatasan dalam penglihatan sehingga harus menggunakan alat bantu berupa tongkat untuk mempermudah perjalanan menuju tempat tujuan. Pada proyek akhir ini, akan di rancang sebuah alat perpaduan antara teknologi dan kebutuhan manusia khususnya penyandang tuna netra. Yaitu tongkat pemandu bagi tunanetra berbasis Hyrbrid Visible Light Communication. Visible Light Communication (VLC) adalah sebuah teknologi komunikasi yang memanfaatkan pancaran cahaya tampak dari lampu LED pada sistem komunikasi. Data yang diterima pada sisi penerima VLC (Rx VLC) yang disimpan di tongkat, kemudian dikirimkan kembali menggunakan modul bluetooth HC-05 pada headphone bluetooth sehingga dapat mengeluarkan suara. Secara keseluruhan alat ini diuji dengan memasangkan lampu sebagai Tx VLC membentuk denah sesuai dengan yang dikehendaki. Lampu yang digunakan merupakan lampu power LED 3 watt serta sensor cahaya yang ada pada tongkat sebagai Rx VLC menggunakan tsl521r. Dari hasil pengujian yang telah dilakukan menunjukan bahwa tongkat pemandu untuk tuna netra ini dapat berfungsi. Tongkat dapat memilih tujuan yang ingin dituju, dan data yang dikirim oleh lampu sebagai Tx VLC dapat diterima hingga mengeluarkan suara pada headphone bluetooth. Selain itu, jarak masing-masing lampu pengirim satu sama lain yaitu 50cm, jarak antara lampu sebagai Tx VLC pada tongkat sebagai Rx VLC jarak minimalnya adalah 10cm dan jarak maksimanya adalah 180cm. Kata kunci : Tongkat Pemandu Tunanetra, Visible Light Communication (VLC), headphone bluetooth, Hybrid Visible Light Communicatio

Dynamic Physical-Layer Secured Link in a Mobile MIMO VLC System

This paper proposes a novel approach to provide a privately secured multiple-input and multiple-output visible light communication (VLC) in the mobility conditions. In the proposed system, a private secured VLC link is adaptively allocated to a mobile user all the time thanks to the movement tracking assistance by a camera-based detection system. The generation of the dynamic location-based scrambling matrix will be introduced providing a secured communication zone within a full normal coverage illumination area. An extensive range of numerical evaluation and practical experiments is carried out to demonstrate and evaluate the proposed system performance in different environment configurations including the mobility, camera resolutions, link range, and environment light intensity. We demonstrate that the proposed system is fully capable of securely steering the information with respect to a receiver location with a high level of reliability

Uplink Design in VLC Systems with IR Sources and Beam Steering

The need for high-speed local area networks to meet the recent developments in multimedia and video transmission applications has recently focused interest on visible light communication (VLC) systems. Although VLC systems provide lighting and communications simultaneously from light emitting diodes, LEDs, the uplink channel design in such a system is a challenging task. In this paper, we propose a solution in which the uplink challenge in indoor VLC is resolved by the use of an Infrared (IR) link. We introduce a novel fast adaptive beam steering IR system (FABS-IR) to improve the uplink performance at high data rates while providing security for applications. The goal of our proposed system is to enhance the received optical power signal, speed up the adaptation process and mitigate the channel delay spread when the system operates at a high transmission rate. The channel delay spread is minimised from 0.22 ns given by hybrid diffuse IR link to almost 0.07 ns. At 2.5 Gb/s, our results show that the imaging FABS-IR system accomplished about 11.7 dB signal to noise ratio (SNR) in the presence of multipath dispersion, receiver noise and transmitter mobility

Experimental demonstration of staggered cap modulation for low bandwidth red-emitting polymer-LED based visible light communications

In this paper we experimentally demonstrate, for the first time, staggered carrier-less amplitude and phase (sCAP) modulation for visible light communication systems based on polymer light-emitting diodes emitting at ∼639 nm. The key advantage offered by sCAP in comparison to conventional multiband CAP is its full use of the available spectrum. In this work, we compare sCAP, which utilises four orthogonal filters to generate the signal, with a conventional 4-band multi-CAP system and on-off keying (OOK). We transmit each modulation format with equal energy and present a record un-coded transmission speed of ∼6 Mb/s. This represents gains of 25% and 65% over the achievable rate using 4-CAP and OOK, respectively