室内可见光通信中的自适应分集接收技术

Adaptive diversity receiving technology for indoor visible light communication

针对室内可见光通信系统中信道是典型的随参信道、数据传输存在多个路径的特点以及室内人员、物体的移动可能会造成信号路径遮挡的问题,提出一种基于变步长最小均方算法的自适应分集接收技术,结合分集接收技术和自适应信号处理技术各自的优点。通过理论分析和仿真验证,与传统的分集接收技术进行对比,对比结果表明,该技术可有效改善接收端信号质量,减小多径传输引起的码间干扰并提高系统对室内环境变化的适应能力。

The communication channel of indoor visible light communication system is a typical parametric variation channel and there are several paths in data transmission.In addition,the movement of people and objects in the house can form barriers to visible light signals.According to the facts mentioned above,a kind of adaptive diversity receiving technology was proposed based on variable step-size least mean square（LMS）algorithm.This technology combined the advantages of diversity receiving technology with those of adaptive signal processing technology.The corresponding theoretical analysis and simulation prove that this technology can effectively enhance the signal quality of receiver,inter-symbol interference（ISI）caused by multipath transmission was reduced and improve the system＇s ability to adjust to the changes of the ambient environment,compared to traditional diversity receiving technology.