Computer Science – Information Theory
Scientific paper
2011-11-04
IEEE Transactions of Wireless Communications, March 2012, Volume 11, Issue 3, Pages 1100-1111
Computer Science
Information Theory
28 pages, 12 figures, to appear in IEEE Transactions of Wireless Communication
Scientific paper
10.1109/TWC.2012.010312.110497
The interference channel achievable rate region is presented when the interference is treated as noise. The formulation starts with the 2-user channel, and then extends the results to the n-user case. The rate region is found to be the convex hull of the union of n power control rate regions, where each power control rate region is upperbounded by a (n-1)-dimensional hyper-surface characterized by having one of the transmitters transmitting at full power. The convex hull operation lends itself to a time-sharing operation depending on the convexity behavior of those hyper-surfaces. In order to know when to use time-sharing rather than power control, the paper studies the hyper-surfaces convexity behavior in details for the 2-user channel with specific results pertaining to the symmetric channel. It is observed that most of the achievable rate region can be covered by using simple On/Off binary power control in conjunction with time-sharing. The binary power control creates several corner points in the n-dimensional space. The crystallized rate region, named after its resulting crystal shape, is hence presented as the time-sharing convex hull imposed onto those corner points; thereby offering a viable new perspective of looking at the achievable rate region of the interference channel.
Charafeddine Mohamad Awad
Han Zhangang
Paulraj Arogyaswami
Sezgin Aydin
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