The Approximate Capacity of the Many-to-One and One-to-Many Gaussian Interference Channels

Details The Approximate Capacity of the Many-to-One and One-to-Many Gaussian Interference Channels The Approximate Capacity of the Many-to-One and One-to-Many Gaussian Interference Channels

2008-09-21

arxiv.org/abs/0809.3554v1

Computer Science

Information Theory

45 pages, 16 figures. Submitted to IEEE Transactions on Information Theory

Scientific paper

Recently, Etkin, Tse, and Wang found the capacity region of the two-user Gaussian interference channel to within one bit/s/Hz. A natural goal is to apply this approach to the Gaussian interference channel with an arbitrary number of users. We make progress towards this goal by finding the capacity region of the many-to-one and one-to-many Gaussian interference channels to within a constant number of bits. The result makes use of a deterministic model to provide insight into the Gaussian channel. The deterministic model makes explicit the dimension of signal scale. A central theme emerges: the use of lattice codes for alignment of interfering signals on the signal scale.

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