@INPROCEEDINGS{payaro:ISIT09,
  author = {M. Payar\'o and D. P. Palomar},
  title = {On optimal precoding in linear vector {G}aussian channels with arbitrary input distribution},
  booktitle = {Proc. IEEE International Symposium on Information Theory (ISIT'09)},
  year = {2009},
  month = {July}
}