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.
In this paper, we propose a statistical channel model to study the performance of a line-of-sight underwater wireless optical communication (UWOC) link in a data mulling environment. We optimize the range of geometric parameters including detector aperture diameter and field-of-view (FOV) to reduce the effect of excessive scattering on the optical signal. By considering geometric losses, we observe...
Multilevel polarization shift keying (MPolSK) is an optical modulation scheme, in which the state of polarization changes according to transmission data. When either the transmitter or the receiver is not fixed, the mismatched polarization axes is caused. It significantly degrades the communication performance. To overcome this problem multilevel differential PolSK (MDPolSK) was proposed, in which...
We consider a visible light communication (VLC) system with light emitting diodes (LEDs), wherein LEDs are used for information transmission as well as reception while providing illumination. At the transmitter, a combination of a pulse width modulation (PWM) signal and a redundant run-length limited encoded on-off keying (OOK) signal is used for data transmission. The LED receiver uses OOK and the...
The paper deals with an analytical model of the transmitter-blocking technique for mitigating short-time fades on free-space optical links. Due to the effect of atmospheric turbulence, the optical channel is characterized by received power fades in the order of tens of milliseconds, during which the transmitted data is lost. Under certain conditions, the propagation through turbulent channel is reciprocal,...
Indoor target tracking has garnered interest as communication systems and mobile device capabilities advance. Visible light communication (VLC) is an alternative to RF methods that uses light emitting diodes. In this paper, probabilistic filtering algorithms (particle and extended Kalman filters) are used for indoor tracking. The performance of the filters is compared with an another positioning method:...
We present the key concepts and design of our proposed framework for a smart supermarket (SMARTKet). We briefly introduce the infrastructure, smart functions, and enabling technologies of the SMARTKet implementation. We especially focus on the basic principles, performance evaluation in terms of localization accuracy, and proof-of-concept implementation of the indoor navigation system using visible...
This paper describes a concept of multi-static primary surveillance radar (MSPSR) developed by ENRI. We have so far proposed an optical fiber connected passive primary surveillance radar (OFC-PPSR) which is based on the principle of passive bistatic radar. A separated receiver unit uses scattered waves from aircraft and radar reference data transmitted by the radio over fiber (RoF). Radio frequency...
This paper presents an energy-efficient visible light communication (VLC) receiver SoC that utilizes ambient light rejection and post-equalization techniques for emerging LiFi applications. Based on ordinary phosphorescent white LEDs, a 24-Mb/s IEEE 802.15.7-compliant LiFi link is demonstrated over 1.6 m with a BER below 10−9.
We propose a novel technique that we call reduced complexity interleaved multi-carrier CDMA (RC I-MC-CDMA) as an alternative to MC-CDMA for indoor VLC systems. It uses shorter CDMA codes and interleaved sub-bands to lower the overall complexity without a significant additional power penalty.
We have developed a fast tunable laser assembly (FTLA) and 10-Gb/s burst mode receiver (BMR) for realizing photonic switched optical networks. Experimental results show that the FTLA enables to support 90 ITU channels with 50-GHz grids at C-band and switching time in wide tuning range is less than 3-μs. Furthermore, the BMR recovers 10-Gb/s burst signals within 400-ns and a receiver sensitivity of...
Recent smart devices offer technologies that can measure indoor as well as outdoor locations. In the case of outdoor positioning, a global positioning system (GPS) is generally used. There is a limit to the method of using the GPS signal for indoor positioning. A typical indoor positioning method is to use a beacon based on bluetooth low energy (BLE). However, this method has disadvantages that needs...
Monolithic CMOS photonics seeks to minimize total transceiver cost by simplifying packaging, design and test. Here, I examine 25 Gb/s applications in commercially available process technology with a focus on receiver sub-system optimization.
In this paper, the influence of disturbance light on visible light communication was investigated. A transmitter and a receiver of 4 pulse position modulation (4PPM) and π/4 differentially coherent quadrature phase-shift keying (π/4 DCQPSK) were fabricated and the bit error rates of the two modulation schemes were compared. This time, an incandescent bulb with a power consumption of 100 W was used...
Atmospheric turbulence and pointing error impairments are the major detriment challenges that degrade the FSO system performance. In this paper, we presented the performance analysis of Block Error Rate (BLER) of Subcarrier Intensity Modulation (SIM) in FSO system over atmospheric turbulence and pointing error channel with the spatial diversity as mitigation tools at the receiving end. The channel...
We report on the fabrication, experimental characterization, and theoretical modeling of delay lines fabricated on a lithium niobate X-cut thin film substrate. We demonstrate the feasibility of fabricating delay lines on lithium niobate suspended thin films to take advantage of the high electromechanical coupling of Lamb waves in this material. Specifically, we design the delay lines with an orientation...
Visible light communication (VLC) has become an option for data communication due to its unregulated bandwidth, being cost effective and not posing any health threats to people and the environment. Several studies on the performance of VLC systems have been conducted, where the systems were used for both solid-state illumination and data transmission. In this paper, an application using a single LED...
MUSER (MingantU SpEctral Radioheliograph) is a solar-dedicated interferometric array that is located in Mingantu town, Inner Mongolia of China and carries out imaging spectroscopy of the Sun with high spatial resolution, high time resolution and high frequency resolution at a wide frequency range from 0.4–2GHz. It was renamed from CSRH (Chinese Spectral Radioheliograph) after its accomplishment. Some...
Turbulent environment can highly affect the performance of free space optical (FSO) communication links. Therefore, how to obtain the turbulence intensity is a very important issue. The paper has shown the detailed analysis to calculate the log irradiance variance (σ2R) along with the experimental verification under an indoor laboratory controlled turbulence condition. This paper verifies the consistency...
Visible light communication (VLC) using light emitted diodes (LEDs) has been considered as the most attractive solution for indoor positioning. In this paper, an indoor visible light positioning system taking account of multiple reflections is investigated. Based on received signal strength indication (RSSI) algorithm, the positioning error distributions are simulated and show that the reflections...
We compared the performance of the asymmetric and direct current bias limiting optical orthogonal frequency division multiplexing (ADO-OFDM), asymmetric limiting optical orthogonal frequency division multiplexing (ACO-OFDM), and the direct current bias limiting optical orthogonal frequency division multiplexing (DCO-OFDM) in visible light communication (VLC) systems. We optimize the power ratio between...
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.