  The aim of this paper is to present an implementation of a functional IEEE
802.15.7 real-time testbed based on the Software Defined Radio (SDR) concept.
This implementation is built with low cost commercial off-the-shelf (COTS)
analog devices and the use of Universal Software Radio Peripheral version 2
(USRP2) equipment combined with a generic object-oriented framework that takes
advantage of several open source software libraries. The prototype is validated
in a controlled laboratory environment with an over-the-air measurement
campaign.
