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• W2890423853 abstract "Analog coding is a low-complexity method to combat erasures, based on linear redundancy in the signal space domain. Previous work examined discrete Fourier transform (DFT) codes for Gaussian channels with erasures or impulses. We extend this concept to source coding with side-information at the encoder and show that the performance of band-limited DFT can be significantly improved using irregular spectrum, and more generally, using equiangular tight frames (ETF). Frames are overcomplete bases and are widely used in mathematics, computer science, engineering, and statistics since they provide a stable and robust decomposition. Design of frames with favorable properties of random subframes is motivated in variety of applications, including code-devision multiple access (CDMA), compressed sensing and analog coding. We present a novel relation between deterministic frames and random matrix theory. We show empirically that the MANOVA ensemble offers a universal description of the spectra of randomly selected subframes with constant aspect ratios, taken from deterministic near-ETFs. Moreover, we derive an analytic framework and bring a formal validation for some of the empirical results, specifically that the asymptotic form for the moments of high orders of subsets of ETF agree with that of MANOVA. Finally, when exploring over-complete bases, the Welch bound is a lower bound on the root mean square cross correlation between vectors. We extend the Welch bound to an erasure setting, in which a reduced frame, composed of a random subset of Bernoulli selected vectors, is of interest. The lower bound involves moment of the reduced frame, and it is tight for ETFs and asymptotically coincides with the MANOVA moments. This result offers a novel perspective on the superiority of ETFs over other frames." @default.
• W2890423853 created "2018-09-27" @default.
• W2890423853 creator A5072814303 @default.
• W2890423853 date "2018-09-19" @default.
• W2890423853 modified "2023-09-25" @default.
• W2890423853 title "Analog Coding Frame-work." @default.
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• W2890423853 hasPublicationYear "2018" @default.
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