2017/02/23 by Marwan Hammouda, Hammouda, Marwan, Jürgen Peissig +3
Engineering · #Optical Wireless Communication Technologies #Advanced Optical Network Technologies #Advanced Photonic Communication Systems
paper · pdf · doi:10.48550/arxiv.1702.07109
In this paper, we consider a cognitive indoor visible light communications\n(VLC) system, comprised of multiple access points serving primary and secondary\nusers through the orthogonal frequency division multiple access method. A\ncognitive lighting cell is divided into two non-overlapping regions that\ndistinguish the primary and secondary users based on the region they are\nlocated in. Under the assumption of equal-power allocation among subcarriers,\neach region is defined in terms of its physical area and the number of\nallocated subcarriers within that region. In this paper, we provide the\nlighting cell design with cognitive constraints that guarantee fulfilling\ncertain illumination, user mobility, and handover requirements in each cell. We\nfurther argue that, under some conditions, a careful assignment of the\nsubcarriers in each region can mitigate the co-channel interference in the\noverlapping areas of adjacent cells. Numerical results depict the influence of\ndifferent system parameters, such as user density, on defining both regions.\nFinally, a realistic example is implemented to assess the performance of the\nproposed scheme via Monte Carlo simulations.\n