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Femotocell has been proposed and deployed to improve the indoor coverage and capacity of a cellular network. One big challenge in its deployment is the interference between the macrocell and femtocell cellular networks. In this paper we propose a new physical layer for the implementation of indoor femtocells – optical femtocells by LED-based visible light communication. A general system structure...
The impulse response and frequency response of indoor visible light communication diffuse channels are characterized experimentally in this paper. Both the short pulse technique and frequency sweep technique are adopted for experimental investigation. The iterative site-based modeling is also carried out to simulate the channel impulse response, and good conformity is observed between the experimental...
Capacity of an indoor multiple-input multiple-output (MIMO) visible light communication (VLC) channel from lighting LED arrays to an imaging receiver is investigated based on Shannon capacity theory.
This paper studies the effects on the performance of a visible light communication link induced by LED lighting degradation and junction temperature variation. A theoretical analysis of the signal-to-noise ratio (SNR) degradation due to LED degradation over time is first carried out. Then simulation results are shown to reveal the SNR degradation. An empirical model for junction temperature variation...
An unobstructed line-of-sight (LOS) channel has to be guaranteed for the outdoor traffic light to vehicle visible light communication system. The performance of such LOS link in an empirical outdoor environment hasn't been characterized experimentally. In this paper, a thorough link characterization is carried out. Possible interference in the LOS link is first characterized, including both background...
LEDs have many advantages compared with the conventional lamps. Therefore LEDs are expected to be the next generation of lamps that will be widely installed to replace conventional lamps. Due to their rapid response times, LED's can be modulated at very high-speeds, which allows the possibility of simultaneously providing communication while illuminating. Considering these facts, a system can be designed...
With the emergence of high lumen output white lighting LEDs, visible light communication has become an intriguing technology to realize low cost data transmission in conjunction with lighting. In this paper, we discuss some key issues in practical line-of-sight (LOS) visible light communication system design. They include a transmitter, channel model, and receiver front-end. A transmitter containing...
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