@article {, title = {FPGA-based Track Circuit for Railways using Transmission Encoding}, journal = {IEEE Transactions on Intelligent Transportation Systems}, volume = {99}, year = {2011}, month = {junio/2011}, pages = {1-12}, issn = {1524-9050}, doi = {10.1109/TITS.2011.2170976}, author = {Felipe Espinosa and Garcia, Juan Carlos and Manuel Mazo and Ure{\~n}a, J. and {\'A}lvaro Hern{\'a}ndez and Mar{\'\i}a del Carmen P{\'e}rez and J. J. Garc{\'\i}a and A. Jim{\'e}nez} }