Abstract
In this paper, we propose a chromaticity-adaptive generalized spatial modulation (CA-GSM) method for multiple-input multiple-output (MIMO) visible light communication (VLC) systems with quadrichromatic LEDs (QLEDs). After the MIMO-VLC system model is constructed, the CA-GSM method based on chromaticity-adaptive constellation optimization is brought forward accounting for the correlated MIMO channel with multi-color crosstalk and quadrangle chromaticity region. This work mainly investigates the optimal active QLED selection pattern in CA-GSM aiming at maximizing the minimum Euclidean distance of received multi-color constellation. Considering power, amplitude and chromaticity constraints, the optimization problem of chromaticity-adaptive constellation is transformed and solved by the linear approximation of Taylor series. Therefore, the design algorithm of CA-GSM is derived with the optimal QLED selection pattern. Simulation results verify that our proposed CA-GSM can achieve performance improvement compared to the multi-stream spatial modulation and the conventional design method without considering channel.
Highlights
Visible light communication (VLC) exhibits rapidly development tendency in recent years since it has many attractive features such as green, safe, low-cost and wide bandwidth [1]–[3]
In this paper, we propose a chromaticity-adaptive generalized spatial modulation (CA-GSM) method for multiple-input multiple-output (MIMO) visible light communication (VLC) systems with quadrichromatic Light-emitting diodes (LEDs) (QLEDs)
Different from the existing researches which focus on the single multi-color LED [25], [26], in this paper, we propose a chromaticity-adaptive generalized spatial modulation (CA-GSM) method for the MIMO-VLC systems composed of QLEDs
Summary
Visible light communication (VLC) exhibits rapidly development tendency in recent years since it has many attractive features such as green, safe, low-cost and wide bandwidth [1]–[3]. Light-emitting diodes (LEDs) are the most extensively used transmitters in VLC which own better lighting quality and lower power cost than conventional lighting devices [4], [5]. To further improve the data rate of VLC systems, multiple input and multiple output (MIMO) have been widely researched and proved to be an effective technique in VLC [6]–[9]. Many MIMO schemes used in traditional radio frequency (RF) communication were extended and employed in VLC such as spatial modulation (SM), generalized spatial modulation (GSM), multi-stream spatial modulation (MS-SM), etc [10], [12]–[14]. In [17], Vol 11, No 4, August 2019
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