Optimal dual frames for erasures
Optimal dual frames for erasures
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DOI:
10.1016/j.laa.2009.08.031
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发表时间:
2010
影响因子:
1.1
通讯作者:
Jerry Lopez;D. Han
中科院分区:
文献类型:
--
作者:
Jerry Lopez;D. Han
For any given frame (for the purpose of encoding) in a finite dimensional Hilbert space, we investigate its dual frames that are optimal for erasures (for the purpose of decoding). We show that in general the canonical dual is not necessarily optimal. Moreover, optimal dual frames are not necessarily unique. We present some sufficient conditions under which the canonical dual is the unique optimal dual frame for the erasure problem. As an application, we get that the canonical dual is the only optimal dual when either the frame is induced by a group representation or the frame is uniform tight.