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• W2168448439 abstract "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 <i xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>total</i> number of degrees of freedom of the <i xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>X</i> network is equal to [(MN)/(M+N-1)] per orthogonal time and frequency dimension. Achievability is proved by constructing interference alignment schemes for X networks that can come arbitrarily close to the outer bound on degrees of freedom. For the case where either M=2 or N=2 we find that the degrees of freedom characterization also provides a capacity approximation that is accurate to within O(1) . For these cases the degrees of freedom outer bound is exactly achievable." @default.
• W2168448439 created "2016-06-24" @default.
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• W2168448439 date "2009-09-01" @default.
• W2168448439 modified "2023-09-27" @default.
• W2168448439 title "Interference Alignment and the Degrees of Freedom of Wireless $X$ Networks" @default.
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• W2168448439 doi "https://doi.org/10.1109/tit.2009.2025541" @default.
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