Abstract
The capacity region of Gaussian interference channel in the weak interference regime is an open problem. Recently, Etkin, Tse and Wang derived an outer bound for the two-user Gaussian interference channel and proved that a simple Han-Kobayashi signaling scheme can achieve within one bit of the capacity region for all values of channel parameters. In this paper, we extend their result to the K-user symmetric cyclic Gaussian interference channel. Our result shows that both the Etkin, Tse and Wang's upper bound and their one-bit achievability result on the symmetric rate continue to hold for the symmetric rate of the K-user symmetric cyclic channel using the same Han-Kobayashi strategy.
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