Shortened Regenerating Codes
Shortened Regenerating Codes
复制标题
缩短的再生代码
DOI:
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发表时间:
2015
影响因子:
2.5
通讯作者:
I. Duursma
中科院分区:
文献类型:
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作者:
I. Duursma
For general exact repair regenerating codes, the optimal trade-offs between the storage size and repair bandwidth remain undetermined. Various outer bounds and partial results have been proposed. Using a simple chain rule argument, we identify nonnegative differences between the functional repair and the exact repair outer bounds, and one of the differences is then bounded from below by the repair data of a shortened subcode. Our main result is a new outer bound for an exact repair regenerating code in terms of its shortened subcodes. In general, the new outer bound is implicit and depends on the choice of shortened subcodes. For the linear case, we obtain explicit bounds.