Link adaptation for MIMO OFDM visible light communication systems

Omer Narmanlioglu, Refik Caglar Kizilirmak, Tuncer Baykas, Murat Uysal

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate link adaptation for an orthogonal frequency division multiplexing (OFDM)-based multiple-input multiple-output (MIMO) visible light communication (VLC) system. The proposed adaptive OFDM VLC system supports both repetition coding (RC) and spatial multiplexing (SM) as MIMO modes and allows spatial mode switching based on channel conditions. Regarding to the instantaneous signal-to-noise ratio for both RC and SM modes, the maximum constellation size that can be supported for each MIMO mode on each subcarrier is determined. The MIMO mode that gives the highest spectral efficiency (SE) is then selected. The proposed joint MIMO mode selection and bit loading scheme maximizes the SE while satisfying a target bit error rate. Our numerical results reveal that a peak data rate up to 18.3 Gb/sec can be achieved in a 16 × 16 MIMO setting using light emitting diodes with cut-off frequency of 10 MHz in typical indoor environments.

Original languageEnglish (US)
Article number8105790
Pages (from-to)26006-26014
Number of pages9
JournalIEEE Access
StatePublished - Nov 10 2017


  • Adaptive transmission
  • Bit loading
  • MIMO mode switching
  • OFDM
  • Visible light communication

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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