Call For Paper Volume:4 Issue:8 Aug'2017 |

ANALYSIS OF VISIBLE LIGHT COMMUNICATION AND OFDMA SYSTEMS

Publication Date : 31/03/2015



Author(s) :

T.KANMANI , N.SARANYA.


Volume/Issue :
Volume 2
,
Issue 3
(03 - 2015)



Abstract :

In wireless communication system, the problem of using crowded radio spectrum can be minimized by the usage of vast unregulated free light spectrum, commonly referred as visible light communication (VLC). Even though duplex communication, user mobility and handover mechanisms are becoming challenging tasks in a VLC system. This paper proposes a hybrid network model of VLC and orthogonal frequency-division multiplexing access (OFDMA) in which the VLC channel is served only for downlink transmission, whereas OFDMA channels are used for uplinks in any location or for downlinks only without VLC hotspots coverage. A unique protocol is proposed which includes the access, horizontal and vertical handover mechanisms for mobile terminal (MT), in order to overcome the user mobility among different systems. An enhanced VLC network proposal and its frame format are described to resolve the problem of multiuser access in every hotspot. Additionally, the capacity of this hybrid network is evaluated by a new metric ρ is defined to evaluate the capacity of this hybrid network as the spatial density of inter arrival time of MT requests in s−1m−2 under the assumption of the homogenous Poisson point process (HPPP) distribution of MTs. When compared to OFDMA systems, capacity and performance of the hybrid network is improved by analytical and simulation results.


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ANALYSIS OF VISIBLE LIGHT COMMUNICATION AND OFDMA SYSTEMS

February 27, 2015