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Updated: Dec 27, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Optical spatial modulation design.

T Cogalan1, H Haas1, E Panayirci2

  • 1University of Edinburgh, Li-Fi R&D Centre, Edinburgh EH9 3JL, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 3, 2020
PubMed
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This study introduces a novel optical Multiple-Input Multiple-Output Spatial Modulation system for Visible Light Communication. It enhances multi-user transmission reliability without complex equipment, overcoming signal-to-noise ratio limitations.

Area of Science:

  • Optical Wireless Communication
  • Signal Processing
  • Telecommunications

Background:

  • Visible Light Communication (VLC) systems face inherent signal-to-noise ratio (SNR) limitations due to link budget constraints.
  • Multiple-Input Multiple-Output (MIMO) techniques offer potential capacity gains but suffer from inter-channel interference.
  • Spatial Modulation (SM) in MIMO systems is hindered by spatial channel similarities, especially in intensity modulation/direct detection (IM/DD) systems lacking phase information.

Purpose of the Study:

  • To propose a novel multi-channel transmission system for reliable multi-user optical MIMO SM transmission in VLC.
  • To enable reliable optical MIMO SM without requiring precoders, power allocation algorithms, or additional receiver optics.
  • To develop a general bit error performance model for SM systems with arbitrary numbers of light-emitting diodes (LEDs) and pulse amplitude modulation.
Keywords:
intensity modulation and direct detectionlight-fidelitymulti-user multiple-input multiple-outputmultiple-input multiple-outputpulse amplitude modulationspatial modulation

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Last Updated: Dec 27, 2025

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Main Methods:

  • Development of a general bit error performance model for SM systems utilizing pulse amplitude modulation and an arbitrary number of LEDs.
  • Design of an LED array structure through transmitter geometry manipulation to create spatially separated multiple channels.
  • Implementation of a multi-channel transmission system enabling reliable multi-user optical MIMO SM.

Main Results:

  • The proposed system facilitates reliable multi-user optical MIMO SM transmission.
  • The system overcomes limitations associated with inter-channel interference and spatial channel similarities in VLC.
  • The transmitter geometry manipulation effectively creates spatially separated channels, enhancing performance.

Conclusions:

  • The developed system provides a viable solution for enhancing capacity and reliability in VLC systems.
  • The proposed LED array structure and SM approach effectively mitigate performance limitations in optical MIMO systems.
  • This research contributes to advancing optical wireless communication technologies through innovative spatial modulation techniques.