On the power and offset allocation for rate adaptation of spatial multiplexing in optical wireless MIMO channels

Ki Hong Park, Young Chai Ko, Mohamed Slim Alouini

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)


In this paper, we consider resource allocation method in the visible light communication. It is challenging to achieve high data rate due to the limited bandwidth of the optical sources. In order to increase the spectral efficiency, we design a suitable multiple-input multiple-output (MIMO) system utilizing spatial multiplexing based on singular value decomposition and adaptive modulation. More specifically, after explaining why the conventional allocation method in radio frequency MIMO channels cannot be applied directly to the optical intensity channels, we theoretically derive a power allocation method for an arbitrary number of transmit and receive antennas for optical wireless MIMO systems. Based on three key constraints: the nonnegativity of the intensity-modulated signal, the aggregate optical power budget, and the bit error rate requirement, we propose a novel method to allocate the optical power, the offset value, and the modulation size. Based on some selected simulation results, we show that our proposed allocation method gives a better spectral efficiency at the expense of an increased computational complexity in comparison to a simple method that allocates the optical power equally among all the data streams.

Original languageEnglish
Article number6451079
Pages (from-to)1535-1543
Number of pages9
JournalIEEE Transactions on Communications
Issue number4
Publication statusPublished - 2013


  • Visible light communication
  • adaptive modulation
  • direct detection
  • intensity modulation
  • optical wireless MIMO
  • rate adaptation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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