• DocumentCode
    3225875
  • Title

    Distributed Multi-stage Coding of Correlated Sources

  • Author

    Saxena, Ankur ; Rose, Kenneth

  • Author_Institution
    Univ. of California, Santa Barbara
  • fYear
    2008
  • fDate
    25-27 March 2008
  • Firstpage
    312
  • Lastpage
    321
  • Abstract
    This paper considers the problem of distributed scalable coding of correlated sources that are communicated to a central unit. The general setting is typically encountered in sensor networks. The conditions of communication channels between the sensor sources and fusion center may be time-varying and it is often desirable to guarantee a base layer of coarse information during channel fades. Specifically, we consider a multi-stage coding system to perform such distributed scalable coding of correlated sources. This problem poses new challenges. We show that mere extensions of distributed coding ideas to include multi-stage coding yield poor rate-distortion performance, due to underlying conflicts between the objectives of scalable and distributed coding. An appropriate system paradigm is developed which allows such tradeoffs to be explicitly controlled within joint optimization of all the system components. We propose an iterative joint design technique and derive the necessary conditions for optimality which yield its update rules. Simulation results show substantial gains over single source (separate) multi-stage coding as well as naive extensions to incorporate scalability in distributed scalable coding schemes.
  • Keywords
    channel coding; sensor fusion; source coding; communication channels; correlated sources; distributed multi-stage coding; fusion center; sensor sources; source coding; Algorithm design and analysis; Communication channels; Data compression; Decoding; Iterative algorithms; Rate-distortion; Scalability; Sensor fusion; Source coding; Training data;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Data Compression Conference, 2008. DCC 2008
  • Conference_Location
    Snowbird, UT
  • ISSN
    1068-0314
  • Print_ISBN
    978-0-7695-3121-2
  • Type

    conf

  • DOI
    10.1109/DCC.2008.64
  • Filename
    4483309