Secrecy capacity of a class of orthogonal relay eavesdropper channels

Vaneet Aggarwal Lalitha Sankar A. Robert Calderbank H. Vincent Poor Secrecy capacity of a class of orthogonal relay eavesdropper channels http://arxiv.org/abs/0812.2275 2008 CoRR abs/0812.2275 db/journals/corr/corr0812.html#abs-0812-2275 informal publication