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首页> 外文期刊>Optoelectronics, IET >Symbol error rate analysis for colour-shift keying modulation in visible light communication system with RGB light-emitting diodes
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Symbol error rate analysis for colour-shift keying modulation in visible light communication system with RGB light-emitting diodes

机译：带有RGB发光二极管的可见光通信系统中色移键控调制的符号错误率分析

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摘要

The symbol error rate (SER) is investigated for colour-shift keying (CSK) modulation in visible light communication system with red/green/blue LEDs. A new concept of pseudo signal-to-noise ratio is proposed to illustrate the relationship between the signal power and the noise power since the traditional electrical signal-to-noise ratio fails to capture the properties of CSK signals. The authors map the three-dimensional (3D) signal space of CSK signals to a 2D plane because the decision region of constellations in 2D space is easy to analyse and is proved to be equivalent to that of 3D signal space. The symbol error probability for a certain constellation is calculated as the summation of the probabilities of the received signals lying outside the decision region. As the SER is formulated as the weighted sum of error probabilities for all constellations, an analytical expression for SER is derived for certain constellation distribution. Moreover, a general formula for 2-CSK modulation is derived by exploiting the distribution regularity of 4CSK and 16CSK. The SER expression for CSK modulation is evaluated approximately using the numerical Gaussian formula. Simulation results show that the analytical expression can predict SER performance accurately.
机译：针对具有红色/绿色/蓝色LED的可见光通信系统中的色键（CSK）调制，对符号错误率（SER）进行了研究。提出了伪信噪比的新概念来说明信号功率与噪声功率之间的关系，因为传统的电信噪比无法捕获CSK信号的特性。作者将CSK信号的三维（3D）信号空间映射到2D平面，因为2D空间中星座的决策区域易于分析，并被证明与3D信号空间等效。将某个星座的符号错误概率计算为位于决策区域之外的接收信号的概率之和。由于SER被公式化为所有星座的误差概率的加权和，因此针对某些星座分布得出SER的解析表达式。此外，通过利用4CSK和16CSK的分布规律性推导了2-CSK调制的通用公式。使用数字高斯公式近似评估CSK调制的SER表达式。仿真结果表明，该解析表达式可以准确预测SER性能。

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