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Inter-cell interference hinders multi-cellular transmission in visible light communication (VLC). We proposed a subcarrier allocation-based cell partitioning to avoid co-channel interference without a large frequency guard and additional RF components. In asynchronous environment, the interference remains due to a timing offset between cells even in the subcarrier allocation-based cell partitioning...
A three dimensional modulation, which can improve the channel capacity of visible optical wireless transmission, is proposed, where it is implemented by the use of the simultaneous modulation of amplitude, phase, and frequency without the request of additional physical bandwidth compared with two dimensional modulation such as quadrature amplitude modulation (QAM). Using the proposed technique, a...
In this paper, we review our recent progress in optical wireless communication systems incorporating infra-red free-space link for in-building personal area networks. We have previously demonstrated a high-speed infrared optical wireless system incorporating localization function that enables limited mobility. Our system is based on light-of-sight transmission but with slightly diffused beam to relax...
In this paper, we present two approaches for the Millimeter-waves (mmW) generation fabricated using active/passive photonic integration technology. The first approach uses the optical heterodyne technique, an 4-channel AWG based laser is built in order to generate a 113 GHz signal. The second approach uses pulsed sources, an on-chip-multiple colliding pulse mode locked laser generating optical modes...
In 5G wireless systems, centralized RAN (C-RAN) is an architectural choice where the signal waveforms received by Remote Radio Heads (RRH) are transparently forwarded to base band units (BBU), in many cases using an optical fronthaul. Although C-RAN highly simplifies the RRH, which is positive from the operational cost standpoint, much of the system complexity and cost is shifted towards the optical...
Coordination among traffic signal controllers in urban areas has been one of the research focuses on Intelligent Transportation Systems (ITS). Many investigations have addressed this topic with the aim of improving the average traffic delay in urban arterials usually by minimizing the number of stops or by maximizing the average speed of the road. Despite the abundant literature, solutions based on...
Future broadband access networks in the 5G framework will need to be bilateral, exploiting both optical and wireless technologies. This paper deals with new approaches and synergies on radio-over-fiber (RoF) technologies and how those can be leveraged to seamlessly converge wireless technology for agility and mobility with passive optical networks for stability, extended coverage and ultra-high speeds...
Visible Light Communication (VLC) is a new emerging technology, where delay is a Quality of Service (QoS) criterion for communication. This paper presents an analysis of the theoretically possible end-to-end delay and hop number for Light on Demand (LoD) and VLC-based multihop networks. Taking the human eye perception as a relevant parameter, total delay is analyzed at the Open Systems Interconnection...
Research infrastructures are the backbone of modern scientific and technological systems and are therefore instrumental in increasing the competitiveness. We present an open research infrastructure, ORCIP, created for the scientific community and industry to test, measure and certificate advanced optical & radio systems.
This paper describes the work and structure of the FIWIN5G: FIber-Wireless Integrated Networks for 5th Generation delivery, an Innovative Training Network (ITN) funded by the European Union's Horizon 2020 research and innovation programme through the Marie Sklodowska-Curie Actions (MSCA) scheme. The programme, which started in January 2015, comprises 10 leading research institutions, a wide range...
Free Space Optics system is an alternative to a wired communication system as it can provide high data rate, low cost, reliable, high transmission rate and security. Due to salient features of optical wireless communication, it has become the center of research in thought of schools of wireless communication. The analysis of modulation schemes is required to improve the efficiency of FSO based transceivers...
This article presents new insights in the research of VLC communication transmitter based on multimode optical fibres. Optical transmitters are formed by a different number of optical fibres. These fibres illuminate the defined surface area in the form of the 1/8 of the sphere, which simulates the room corner. The aim of this article is to point to possible new trends in the field of research such...
Presently, wireless local area networks (WLANs) are experiencing a tremendous increase of wireless bandwidth hungry devices and the increasing deployment of cloud-based enterprise networks. Additionally, mobile operators with heavily congested cellular networks are exploring the strategy of offload traffic from their cellular networks to WiFi hotspots. Technologies that were originally proposed for...
This paper reviews train communication networks (TCNs) based on radio-over-fibre (RoF) technology. TCNs connect base stations (BSs) in trains to world wide networks through trackside links consisting of optical fibres and many radio access units (RAUs). Waveform for radio communications can be effectively delivered to each RAU by RoF. The TCN can be controlled by train location information to reduce...
The increase of data traffic in wireless networks is requiring the bandwidth of photonics for the antenna data relay. While the distribution of RF signals through Radio-over-Fiber has become a well-accepted and established technology thanks to the low loss of fibers in signal transportation, photonics still has lot to offer to the radio world. RF signal generation, detection, and conditioning (e.g...
Location data reflects user preferences and even interdependency among users. Owing to this interdependency, the advertiser can push the corresponding products to users through location recommendations, i.e., advertisement targeting. To maximize the profitability of advertisement targeting, a novel design framework of optical-wireless hybrid virtual network embedding is proposed by us. This framework...
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