Abstract As communication-based safety applications are developed for the next generation of vehicle active safety systems, this article focuses on the benefits of using adaptive hysteresis circuits toward the development… Click to show full abstract
Abstract As communication-based safety applications are developed for the next generation of vehicle active safety systems, this article focuses on the benefits of using adaptive hysteresis circuits toward the development of environmental-adaptive VLC sensors with significantly enhanced performances. Thus, analytical and numerical approaches to analyze hysteresis systems with noisy input are discussed and the benefits of adaptive hysteresis are presented. Furthermore, a linear relation between optimal hysteresis thresholds and noise strengths is determined. The experimental validation of the theoretical results is performed by using a Schmitt Trigger with threshold values adjusted by digital potentiometers controlled by an embedded microcontroller. Significant BER improvement is obtained by the hysteresis threshold adjustment.
               
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