Interference Alignment and the Degrees of Freedom of Wireless $X$ Networks

@article{Cadambe2009InterferenceAA,
  title={Interference Alignment and the Degrees of Freedom of Wireless \$X\$ Networks},
  author={V. Cadambe and S. Jafar},
  journal={IEEE Transactions on Information Theory},
  year={2009},
  volume={55},
  pages={3893-3908}
}
We explore the degrees of freedom of M times N user wireless X networks, i.e., networks of M transmitters and N receivers where every transmitter has an independent message for every receiver. We derive a general outer bound on the degrees of freedom region of these networks. When all nodes have a single antenna and all channel coefficients vary in time or frequency, we show that the total number of degrees of freedom of the X network is equal to [(MN)/(M+N-1)] per orthogonal time and frequency… Expand
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