Spectral and Energy Efficiency of ACO-OFDM in Visible Light Communication Systems

Shuai Ma, Ruixin Yang, Xiong Deng, Xintong Ling, Xun Zhang, Fuhui Zhou, Shiyin Li (Corresponding author), Derrick Wing Kwan Ng

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Abstract

In this paper, we study the spectral efficiency (SE) and energy efficiency (EE) of asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) for visible light communication (VLC). Firstly, we derive the achievable rates for Gaussian distributions inputs and practical finite-alphabet inputs. Then, we investigate the SE maximization problems subject to both the total transmit power constraint and the average optical power constraint with the above two inputs, respectively. By exploiting the relationship between the mutual information and the minimum mean-squared error, an optimal power allocation scheme is proposed to maximize the SE with finite-alphabet inputs. To reduce the computational complexity of the power allocation scheme, we derive a closed-form lower bound of the SE. Also, considering the quality of service, we further tackle the non-convex EE maximization problems of ACO-OFDM with the two inputs, respectively. The problems are solved by the proposed Dinkelbach-type iterative algorithm. In each iteration, the interior point algorithm is applied to obtain the optimal power allocation.The performance of the proposed power allocation schemes for the SE and EE maximization are validated through numerical analysis.

Original languageEnglish
Article number9535315
Pages (from-to)2147-2161
Number of pages15
JournalIEEE Transactions on Wireless Communications
Volume21
Issue number4
DOIs
Publication statusPublished - 1 Apr 2022

Keywords

  • ACO-OFDM
  • Adaptive optics
  • energy efficiency
  • Gaussian distribution
  • OFDM
  • Optical signal processing
  • Resource management
  • spectral efficiency
  • Visible light communication
  • visible light communications
  • Wireless communication

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