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Visible light communication moves to the advanced research period for developing application services, but most of applications are limited only to PtP service model. However, PtMP communication environment for VLC is required to accommodate more various applications. In this paper, we analyze an effect of key parameters on network performance in the star(More)
VLC system transmits data by controlling LED and receives data through photo diode, which is considered as one of strong candidates of next generation wireless communication systems. Especially, VLC shows a better performance than the existing indoor positioning technology using WPAN as it can measure in the unit of cm to mm. In this paper, we proposed an(More)
Visible light communication (VLC) is expected to be the next generation of indoor wireless communication. A VLC system uses many LED chips, and its performance is greatly affected by the direction of light-emitting diodes (LEDs). Normally, the LEDs are directed vertically downward to the floor. In this paper, we introduce an LED layout scheme in which the(More)
In this paper, we propose an indoor positioning system in which the visible light radiated from LEDs is used to locate the position of receiver. Compared to current indoor positioning systems using LED light, our system has the advantages of simple implementation, low cost and high accuracy. In our system, a single photo diode (PD) receives pilot signals(More)
Visible light communication (VLC) is expected to be the next generation of indoor wireless communication. Commonly, a VLC system uses many LED chips, and its performance is affected a lot by the placement of LEDs. In this paper, we propose LED panel model that can place LEDs with some angle. Based on the simulation results, the effect of changing LED(More)
In this paper, we propose an efficient congestion control algorithm based on the traffic prediction for OBS network. Through the performance analysis, it is confirmed that the proposed algorithm based on prediction effectively decreases the burst loss as compared to the congestion control algorithm with current information.
Wireless mesh network (WMN) has drawn much attention as a cost-effective way of providing wireless Internet service in wide area. The optimization problems have been an issue in wireless mesh network. In the previous studies, optimal locations of gateways are determined so that deployment cost is minimized while satisfying the required network performance.(More)
To address the burst loss problem in OBS network, we propose a new optical burst control algorithm, which estimates the future burst traffic condition to eliminate the effect of congestion reaction delay. Through the simulations, we verify that the proposed algorithm outper-forms other existing burst control algorithms. 1 Problem statement In optical burst(More)