Bandwidth efficient multi-level MPPM encoding decoding algorithms for joint brightness-rate control in VLC systems

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI:10.1109/GLOCOM.2014.7037125

A. Siddique, Muhammad Tahir

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引用次数: 9

Abstract

A number of binary modulation schemes are proposed for LED based Visible Light Communication (VLC) systems to jointly achieve data transmission and brightness control. These binary modulation based solutions are spectrally inefficient because they consider the LED light source as single device. We observe that most of the commercial LED lights use more than one LED per light source and the possibility of individual current control of these LEDs would provide better brightness control resolution as well as higher data transmission rates. To achieve this we propose multi-level multi-pulse position modulation block coding scheme to jointly control multiple LEDs providing flicker free VLC link. The brightness level of the light source is controlled based on the number of LEDs switched on simultaneously. New algorithms are developed for symbol encoding/decoding as well as to enumerate the maximum number of symbols that can be encoded for the selected brightness level and the number of levels. Improvement in spectral efficiency is analyzed and compared with the contending binary modulation schemes.

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用于VLC系统联合亮度控制的带宽高效多级MPPM编解码算法

针对基于LED的可见光通信(VLC)系统，提出了多种二进制调制方案，以共同实现数据传输和亮度控制。这些基于二进制调制的解决方案在频谱上效率低下，因为它们将LED光源视为单个器件。我们观察到，大多数商用LED灯每个光源使用多个LED，并且这些LED的单独电流控制的可能性将提供更好的亮度控制分辨率以及更高的数据传输速率。为了实现这一目标，我们提出了多级多脉冲位置调制分组编码方案，以联合控制多个led，提供无闪烁的VLC链路。光源的亮度水平是根据同时打开的led的数量来控制的。开发了用于符号编码/解码的新算法，以及枚举可为所选亮度级别和级别数编码的最大符号数。分析和比较了与之竞争的二元调制方案在频谱效率方面的改进。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 IEEE Global Communications Conference

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