IEEE Transactions on Information Theory
Degrees of Freedom Region of the MIMO X Channel
IEEE Transactions on Information Theory
Communication Over MIMO X Channels: Interference Alignment, Decomposition, and Performance Analysis
IEEE Transactions on Information Theory
Gaussian Interference Channel Capacity to Within One Bit
IEEE Transactions on Information Theory
Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies
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We study the sum capacity of the X channel generalization of the symmetric 2-user interference channel. In this X channel, there are 4 independent messages, one from each transmitter to each receiver. We characterize the sum capacity of a deterministic version of this channel, and obtain the generalized degrees of freedom characterization for the Gaussian version. The regime where the X channel outperforms the underlying interference channel is explicitly identified, and an interesting interference alignment scheme based on a cyclic decomposition of the signal space is shown to be optimal in this regime.