Abstract

Visible light communication (VLC) systems are inherently signal-to-noise ratio (SNR) limited due to link budget constraints. One favourable method to overcome this limitation is to focus on the pre-log factors of the channel capacity. Multiple-input multiple-output (MIMO) techniques are therefore a promising avenue of research. However, inter-channel interference in MIMO limits the achievable capacity. Spatial modulation (SM) avoids this limitation. Furthermore, the performance of MIMO systems in VLC is limited by the similarities among spatial channels. This limitation becomes particularly severe in intensity modulation/direct detection (IM/DD) systems because of the lack of phase information. The motivation of this paper is to propose a system that results in a multi-channel transmission system that enables reliable multi-user optical MIMO SM transmission without the need for a precoder, power allocation algorithm or additional optics at the receiver. A general bit error performance model for the SM system is developed for an arbitrary number of light-emitting diodes (LEDs) in conjunction with pulse amplitude modulation. Based on this model, an LED array structure is designed to result in spatially separated multiple channels by manipulating the transmitter geometry.This article is part of the theme issue ‘Optical wireless communication’.

Highlights

  • Visible light communication (VLC) is becoming a promising technology for indoor environments by using light-emitting diodes (LEDs) for illumination as well as2020 The Authors

  • It has been demonstrated that channel similarities can be reduced by manipulating the transmitter geometry and Spatial modulation (SM) can be employed for intensity modulation/direct detection (IM/direct detection (DD)) systems

  • Simulation results show that the proposed structure can achieve sufficient bit error ratio (BER) performance to apply forward error correction (FEC) channel coding for a single user inside a 4 m × 4 m × 3 m room

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Summary

Introduction

Visible light communication (VLC) is becoming a promising technology for indoor environments by using light-emitting diodes (LEDs) for illumination as well as. It is shown that the optical multi-transmit element channel have close similarities and, employing SM relies on the appropriate design of the transmitter and receiver [16,18,19]. Instead of designing a precoder, power control algorithm and/or a receiver with some optics, a novel transmit LED array structure along with multiple simple LEDs and non-imaging PDs at the receiver is proposed. According to the generalized relationship, an LED array structure design is proposed to separate multiple channels by manipulating the transmitter geometry without the need to employ either a power allocation algorithm or a precoder. The argument of the minimum and maximum are represented by arg min{.} and arg max{.}, respectively

System model
Minimum error performance
Designing light-emitting diodes array structure
Light-emitting diodes selection for transmission
System simulation results
Findings
Conclusion
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