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- W2118020972 abstract "We characterize the symmetric capacity of the two-user Gaussian interference channel with <i xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>feedback</i> to within 1 bit/s/Hz. The result makes use of a deterministic model to provide insights into the Gaussian channel. We derive a new outer bound to show that a proposed scheme can achieve the symmetric capacity to within one bit for all channel parameters. One consequence of the result is that feedback provides <i xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>unbounded</i> gain, i.e., the gain becomes arbitrarily large for certain channel parameters. It is a surprising result because feedback has been so far known to provide no gain in memoryless point-to-point channels and only power gain ( <i xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>bounded</i> gain) in the multiple access channels. The gain comes from using feedback to fully exploit the side information provided by the broadcast nature of the wireless medium." @default.
- W2118020972 created "2016-06-24" @default.
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- W2118020972 date "2009-06-01" @default.
- W2118020972 modified "2023-10-16" @default.
- W2118020972 title "Symmetric feedback capacity of the Gaussian interference channel to within one bit" @default.
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- W2118020972 doi "https://doi.org/10.1109/isit.2009.5205805" @default.
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