  An LED-ID system works like an electronic "tag" transmitting a short digital
broadcasted message. Low complexity LED-ID installations, being a subset of an
emerging class of visible light communication (VLC) systems, may be considered
as a replacement of popular RFID tags, Bluetooth tags and Wi-Fi beacons. In
this work, we focus on multi LED-ID environments with "dense" tag placement.
The problems that we focus on are estimating the level of cross-tag
interference and the issue of tag proximity: how closely can we place the tags
without making the system unusable? We present a theoretical model with a
numerical simulation of sample arrangements. We also describe the results of
experiments we conducted in a real- world test environment under different
external lighting conditions.
