Energy Efficient Subchannel and Power Allocation in Cooperative VLC Systems Articles uri icon

publication date

  • June 2021

start page

  • 1935

end page

  • 1939

issue

  • 6

volume

  • 25

International Standard Serial Number (ISSN)

  • 1089-7798

Electronic International Standard Serial Number (EISSN)

  • 1558-2558

abstract

  • This letter studies the energy efficiency (EE) optimization of cooperative visible light communication (VLC) systems while considering the inter-cell interference and the lineof-sight blockage problems. Specifically, the optimization problem of subchannel and power allocation to maximize EE under transmit power budgets and users' minimum rate constraints is considered. The formulated problem turns out to be a difficult nonlinear fractional program for which a low-complexity iterative solution based on fractional programming theory and the quadratic transform approach is proposed. Extensive simulations are conducted to show the efficacy of the proposed scheme over conventional approaches. In addition, the outage analysis and impacts of varying the transmit power and the subchannel bandwidth on the EE performance are investigated.

subjects

  • Telecommunications

keywords

  • energy efficiency; joint transmission; quadratic transform; resource allocation; visible light communication