Abstract
Visible light communications seeks to leverage an unused medium for indoor wireless communications. A
major goal is to deliver very high data-rates through LED luminaires to all places where we use lighting. However, the
characteristics of LEDs and the nature of indoor lighting conspire to distort the signals. Illumination powers LEDs
have low signaling bandwidth and exhibit severe frequency distortion. Their wide dispersion patterns, required for
light and signal coverage, also add multipath distortion. Intermittent shadowing results in a wide range of channel
characteristics. In this paper we address these challenges with an adaptive receiver. Namely, training is used to
identify channel impairments, and our proposed receiver applies specific countermeasures including threshold
detection, RAKE reception and adaptive channel equalization. Analysis and simulation demonstrate that our design
mitigates distortion problems yielding a performance improvement of 40% to 100% with respect to the
current literature in achievable bit-rate depending on the propagation scenario.
© 2013 EU
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