The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multiple-input-multiple-output (MIMO) technique for visible light communications (VLC) facilitates higher data rate thanks to parallel data transmission. However, full channel-state information (CSI) is a requirement in a MIMO system at all times for successful data recovery, which is a major challenging factor in mobility and shadowing scenarios. In this paper we introduce a novel approach for a...
This paper studies multi-user multiple-input multiple-output (MU-MIMO) visible light communications (VLC) for indoor broadcast systems. Transmitters, configured as multiple LED arrays, and multiple users equipped with multiple photodetectors (PD) are considered. The main challenge in such broadcast systems is the multi-user interference (MUI). In order to completely suppress the MUI, the block diagonalization...
In this paper, the PWM encoding of an optical OFDM transmission is studied and simulated. Traditional optical OFDM schemes make use of linear drivers, but the inherent nonlinear behavior of the optical emitters produce a harmful effect on the demodulated signal. PWM allows the use of nonlinear drivers, avoiding this harmful effects and increasing the efficiency of the transmission. Furthermore, synchronization...
The concept of small cells (SCs) is widely acknowledged for its significant benefits in energy efficiency and capacity of heterogeneous cellular networks. However, a large scale outdoor installation of SCs is limited by cost factors. Therefore, wireless backhaul communication and wireless power supply to SCs could significantly reduce deployment costs. The focus of this paper is on the investigation...
The acquisition of environmental information from vehicles is expected to overload cellular networks. Short range vehicle-to-vehicle and vehicle-to-roadside wireless communication technologies, such as IEEE 802.11p, are being foreseen for the offloading of cellular networks. A nearer breakthrough in this direction is represented by visible light communication (VLC), which can exploit light emitting...
Visible Light Communications (VLC) have been promoted as an energy-efficient Gb/s-technology for indoor settings, since VLC can be merged with the illumination functionality. As a result, Joint Illumination and visible-light Communication (JIC) systems are perceived as a green technology and the research on VLC mainly focuses on increasing the data rates. In this paper, we demonstrate that the communication...
Visible Light Communication (VLC) is gaining interest as a viable option to supplement next generation wireless communication systems with dense directional wireless cells. The effect of interference is important when analyzing aggregate performance of these systems. Just as signal to noise ratio (SNR) is used to evaluate link performance when disturbances are primarily related to noise, signal to...
In this paper, the Bit Error Rate (BER) performance of three major space modulation techniques in a Multiple-Input Multiple-Output (MIMO) Visible Light Communication (VLC) system is studied. The considered space modulation techniques are Optical Spatial Modulation (OSM); Optical Generalized Spatial Modulation (OGeSM); and Optical Multi-Stream Spatial Modulation (OMS-SM). The space modulation techniques...
In this paper, multilevel Digital Colour Shift Keying (DCSK) and DCSK using multi-colour LEDs are considered. Moreover, to increase the spectral efficiency of DCSK, Spatial Colour Shift Keying (SCSK) is proposed, in which DCSK is combined with Space Shift Keying. The symbol error rate of DCSK and SCSK performances are evaluated from theoretical analysis and simulation analysis, under consideration...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.