2,604 research outputs found
Degree-degree Correlated Low-density Parity-check Codes Over a Binary Erasure Channel
Most existing works on analyzing the performance of a random ensemble of
low-density parity-check (LDPC) codes assume that the degree distributions of
the two ends of a randomly selected edge are independent. In the paper, we take
one step further and consider ensembles of LDPC codes with degree-degree
correlations. For this, we propose two methods to construct an ensemble of
degree-degree correlated LDPC codes. We then derive a system of density
evolution equations for such degree-degree correlated LDPC codes over a binary
erasure channel (BEC). By conducting extensive numerical experiments, we show
how the degree-degree correlation affects the performance of LDPC codes. Our
numerical results show that LDPC codes with negative degree-degree correlation
could improve the maximum tolerable erasure probability. Moreover, increasing
the negative degree-degree correlation could lead to better unequal error
protection (UEP) design.Comment: accepted by the 2023 IEEE International Symposium on Information
Theory (ISIT
An Architectural Approach to the Design and Analysis of Cyber-Physical Systems
This paper presents an extension of existing software architecture tools to model physical systems, their interconnections, and the interactions between physical and cyber components. A new CPS architectural style is introduced to support the principled design and evaluation of alternative architectures for cyber-physical systems (CPSs). The implementation of the CPS architectural style in AcmeStudio includes behavioral annotations on components and connectors using either finite state processes (FSP) or linear hybrid automata (LHA) with plug-ins to perform behavior analysis using the Labeled Transition System Analyzer (LTSA) or Polyhedral Hybrid Automata Verifier (PHAVer), respectively. The CPS architectural
style and analysis plug-ins are illustrated with an example
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