@article {, title = {FPGA-Based Track Circuit for Railways Using Transmission Encoding}, journal = {IEEE Transactions on Intelligent Transportation Systems}, volume = {13}, year = {2012}, month = {03/2012}, pages = {437-448}, issn = {1524-9050}, doi = {10.1109/TITS.2011.2170976}, author = {{\'A}lvaro Hern{\'a}ndez and Mar{\'\i}a del Carmen Perez and J.J. Garcia and Ana Jimenez and Garcia, Juan Carlos and Felipe Espinosa and Manuel Mazo and Ure{\~n}a, J.} }