MIMO optical wireless communications using ACO-OFDM and a prism-array receiver

Qian Wang, Roger Julian Green, Jean Armstrong

Research output: Contribution to journalArticleResearchpeer-review

33 Citations (Scopus)

Abstract

In this paper, we analyze the performance of a prism-array receiver in a multiple-input multiple-output (MIMO) intensity-modulated direct-detection optical wireless communication system. The elements of the MIMO channel matrix depend on the geometry of each prism and the orientation of the prism relative to the optical transmitter. An expression is derived for each channel gain as a function of the angle of the prism, the aspect ratio and area of the receiving surface of the prism, and the orientation and distance between the transmitter and receiver. Results are presented for the directionality and overall field of view (FOV) of a receiver comprising six prisms, showing that compact receivers can be designed, which combine well-conditioned channel matrices with wide FOVs. Simulation results are presented for a typical indoor visible light communication system where four light-emitting diode lights transmit information using asymmetrically clipped optical orthogonal frequency division multiplexing and linear equalizers are used in the receiver. It is shown that the overall bit error rate depends very strongly on the angle of the prisms and on the position of the receiver, but that a simple six-prism receiver can successfully decouple the four transmitted signals at typical receiver positions within the room
Original languageEnglish
Pages (from-to)1959 - 1971
Number of pages13
JournalIEEE Journal on Selected Areas in Communications
Volume33
Issue number9
DOIs
Publication statusPublished - 2015

Keywords

  • ACO-OFDM
  • compact receiver
  • field of view (FOV)
  • IM/DD, multiple-input multiple-output (MIMO)
  • optical wireless communications
  • prism array

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