کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9500319 | 1337608 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Frame expansions with erasures: an approach through the non-commutative operator theory
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
آنالیز ریاضی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
In modern communication systems such as the Internet, random losses of information can be mitigated by oversampling the source. This is equivalent to expanding the source using overcomplete systems of vectors (frames), as opposed to the traditional basis expansions. Dependencies among the coefficients in frame expansions often allow for better performance compared to bases under random losses of coefficients. We show that for any n-dimensional frame, any source can be linearly reconstructed from only O(nlogn) randomly chosen frame coefficients, with a small error and with high probability. Thus every frame expansion withstands random losses better (for worst case sources) than the orthogonal basis expansion, for which the nlogn bound is attained. The proof reduces to M. Rudelson's selection theorem on random vectors in the isotropic position, which is based on the non-commutative Khinchine's inequality.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied and Computational Harmonic Analysis - Volume 18, Issue 2, March 2005, Pages 167-176
Journal: Applied and Computational Harmonic Analysis - Volume 18, Issue 2, March 2005, Pages 167-176
نویسندگان
Roman Vershynin,