Demodulation method for distorted carrier of visible light communication in indoor positioning for autonomous robots
Demodulation method for distorted carrier of visible light communication in indoor positioning for autonomous robots
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DOI：
10.1109/icarm.2017.8273188
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
Wang Ke;Chen Jingjing;L. Zhiwei;Huang Zhen
中科院分区：
文献类型：
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作者：
Wang Ke;Chen Jingjing;L. Zhiwei;Huang Zhen
可见光定位具有传统无线定位无法替代的优势。然而，由于发光二极管的非线性特性，使得可见光定位系统受到光通信载波失真的影响。因此，相敏检测解调技术，提出了解决这个问题。该技术利用信号频谱畸变的特点，依靠相敏检波解调方法抑制高次谐波干扰。该技术无需发射器中的硬件预失真，大大简化了定位系统的复杂性。仿真结果表明，在室内环境下，1、1.5和2 MHz/s载波数据的误码率小于10−6，满足自主机器人室内可见光定位的要求。
Visible light positioning offers some advantages not to be substituted by the traditional wireless positioning. However, visible light positioning systems are subjected to the problem of the optical communication carrier distortion caused by the nonlinear characteristics of light-emitting diodes. A phase-sensitive detection demodulation technique is therefore proposed to address this problem. This technique makes use of the distorted signal frequency spectrum characteristics and relies on the phase-sensitive detection demodulation method to suppress the harmonic interferences of higher orders. Dispensing with the need for hardware predistortion in the emitter, this technique simplifies substantially the complexity of the positioning system. Simulations show that the bit error rates of 1, 1.5, and 2 MHz/s carrier data are less than 10−6 in indoor environments, satisfying the requirement of indoor visible light positioning for autonomous robots.