@conference {, title = {Preliminary Simulation for an Optical _ Indoor Positioning System based on cyclin {\textendash} Time difference of Arrival.}, booktitle = {2016 International Conference on Indoor Positioning Systems.}, year = {2016}, month = {10/2016}, pages = {1-10}, publisher = {IEEE}, organization = {IEEE}, address = {Alcala de Henares, Espa{\~n}a }, isbn = {978-1-5090-2425-4/16/$31.00}, author = {Angel Cano and Y. Pompa and Jose L. Lazaro} }