  Taking advantage of the rolling shutter effect of CMOS cameras in smartphones
is a common practice to increase the transfered data rate with visible light
communication (VLC) without employing external equipment such as photodiodes.
VLC can then be used as replacement of other marker based techniques for object
identification for Augmented Reality and Ubiquitous computing applications.
However, the rolling shutter effect only allows to transmit data over a single
dimension, which considerably limits the available bandwidth. In this article
we propose a new method exploiting spacial interference detection to enable
parallel transmission and design a protocol that enables easy identification of
interferences between two signals. By introducing a second dimension, we are
not only able to significantly increase the available bandwidth, but also
identify and isolate light sources in close proximity.
