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This paper stands at the intersection of two distinct lines of research. One line is " holographic algorithms, " a powerful approach introduced by Valiant for solving various counting problems in computer science; the other is " normal factor graphs, " an elegant framework proposed by Forney for representing codes defined on graphs. We introduce the notion… (More)

—In this letter, we present a new message-passing schedule for the decoding of low-density parity-check (LDPC) codes. This approach, designated " probabilistic schedule, " takes into account the structure of the Tanner graph (TG) of the code. We show by simulation that the new schedule offers a much better performance/complexity trade-off. This work also… (More)

This paper studies the problem of Raptor-code design for binary-input AWGN (BIAWGN) channels using the mean-LLR-EXIT chart approach presented in [1]. We report that there exist situations where such a design approach may fail or fail to produce capacity-achieving codes, for certain ranges of channel SNR. Suggestions and discussions are provided pertaining… (More)

— We propose a novel coding framework for wireless relay channels based on rateless codes, which allows for a natural extension to multiple antenna and multiple relay settings. The relaying protocol is half-duplex, and relays independently choose when to collaborate, if at all. With a simulated fountain code based implementation of this framework, we show… (More)

— The highly stochastic nature of wireless environments makes it desirable to monitor link loss rates in wireless sensor networks. In a wireless sensor network, link loss monitoring is particularly supported by the data aggregation communication paradigm of network traffic: the data collecting node can infer link loss rates on all links in the network by… (More)

- Dragan Radulovic, Salomeh Jelveh, Soyoung Ryu, T Guy Hamilton, Eric Foss, Yongyi Mao +1 other
- Molecular & cellular proteomics : MCP
- 2004

We have developed an integrated suite of algorithms, statistical methods, and computer applications to support large-scale LC-MS-based gel-free shotgun profiling of complex protein mixtures using basic experimental procedures. The programs automatically detect and quantify large numbers of peptide peaks in feature-rich ion mass chromatograms, compensate for… (More)

—We introduce the concept of convolutional factor graphs, which represent convolutional factorizations of mul-tivariate functions, just as conventional (multiplicative) factor graphs represent multiplicative factorizations. Convolutional and multiplicative factor graphs arise as natural Fourier transform duals. In coding theory applications, algebraic… (More)