@article{DBLP:journals/tcom/LozanoTV08,
  author    = {Angel Lozano and
               Antonia Maria Tulino and
               Sergio Verd{\'u}},
  title     = {Optimum Power Allocation for Multiuser OFDM with Arbitrary
               Signal Constellations},
  journal   = {IEEE Transactions on Communications},
  volume    = {56},
  number    = {5},
  year      = {2008},
  pages     = {828-837},
  ee        = {http://dx.doi.org/10.1109/TCOMM.2008.060211},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}