Abstract
Visible light communication(VLC), which combines communication and illumination, is regarded as a potential wireless communication. For illumination requirements of VLC systems, dimming control is a significant function. Many schemes have been proposed for multi-input multi-output (MIMO) VLC systems or dimmable VLC systems, but few schemes combine the two. The dimming control scheme that has been proposed for MIMO-VLC systems in the reference still has a probability for improvement in spectral efficiency and error performance. This paper proposes a dimming control scheme that utilizes the constant weight space-time codes (CWSTC) to improve spectral efficiency and error performance for MIMO-VLC systems. Simultaneously, we also present the codeword structure and a low implementation complexity detection algorithm for the scheme. Finally, performance analysis and simulation results provide comparisons between the proposed scheme and other existing dimming control schemes.
Highlights
Visible light communication(VLC) is a potential kind of wireless communication with significant developments in recent years
This paper proposes a dimming control scheme that utilizes the constant weight space-time codes (CWSTC) to improve spectral efficiency and error performance for multi-input multi-output (MIMO)-VLC systems
The CWSTC scheme we proposed is applicable to general Nt × Nr MIMO-VLC systems as long as Nr Nt, where Nr is the number of receivers and Nt is the number of transmitters
Summary
Visible light communication(VLC) is a potential kind of wireless communication with significant developments in recent years. Multilevel pulse amplitude modulation (ML-PAM) scheme [12], multilevel parity-check codes (ML-PCC) scheme [13] and variable pulse amplitude and position modulation (VPAPM) scheme [14] are representative schemes for multiple-input single-output (MISO) systems These multi-LED dimming control schemes have improved spectral efficiency distinctly, there is still the possibility of further improvement. Angle diversity techniques and optimized constellation design for MIMO-VLC systems are proposed in [15] and [16] respectively Both two schemes do not take into consideration the constraint of dimming control. Uniform illumination space-time codes (UISTC) scheme [18] is a dimming control scheme for MIMO systems It can realize high data rate communication and achieve dimming targets, but the error performance and spectral efficiency are still likely to be improved.
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