Rate Region of the (4,3,3) Exact-Repair Regenerating Codes
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abstract
Exact-repair regenerating codes are considered for the case (n, k, d) = (4, 3,3), for which a complete characterization of the rate region is provided. This characterization answers in the affirmative the open question whether there exists a non-vanishing gap between the optimal bandwidth-storage tradeoff of the functional-repair regenerating codes (i.e., the cut-set bound) and that of the exact-repair regenerating codes. The converse proof relies on the existence of symmetric optimal solutions. For the achievability, only one non-trivial corner point of the rate region needs to be addressed, for which an explicit binary code construction is given. 2013 IEEE.
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2013 IEEE International Symposium on Information Theory