• Login
    View Item 
    •   etd@IISc
    • Division of Electrical, Electronics, and Computer Science (EECS)
    • Electrical Communication Engineering (ECE)
    • View Item
    •   etd@IISc
    • Division of Electrical, Electronics, and Computer Science (EECS)
    • Electrical Communication Engineering (ECE)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Real-Time Status Updates Over Erasure Channels

    View/Open
    Complete Thesis (505.8Kb)
    Author
    Bobbili, Sarat Chandra
    Metadata
    Show full item record
    Abstract
    Real-time decision making relies on the availability of accurate data and, as such, delivering status updates in a timely fashion is of paramount importance. In this thesis, we first look at the interplay between average timeliness and design decisions made at the physical layer, for unreliable communication channels. Specifically, this study focuses on the natural tension between the protection afforded by additional redundancy and the decoding delay associated with longer codewords in the presence of feedback. The average timeliness is adopted as an evaluation criterion, and a framework to efficiently compute the performance of various transmission schemes for the binary erasure channel is developed. We show that the average timeliness decreases as we increase the feedback rate in a hybrid ARQ scheme. In particular, we provide design guidelines for codeword length selection for an hybrid ARQ scheme to improve the average information timeliness. We show numerical examples to further illustrate the applicability of our findings. Second, we study periodic transmission schemes for sources with highly correlated information. In contrast to the previous model, the source periodically sends the actual information interleaved with differential messages. This encoding scheme has been studied previously in the literature, and it is known that differential encoding can improve timeliness only under the assumption of perfect feedback with a cost.We show that differential encoding can have better average information timeliness even if no receiver feedback is available, by carefully selecting the codeword length of the differential messages.
    URI
    https://etd.iisc.ac.in/handle/2005/4440
    Collections
    • Electrical Communication Engineering (ECE) [398]

    etd@IISc is a joint service of SERC & J R D Tata Memorial (JRDTML) Library || Powered by DSpace software || DuraSpace
    Contact Us | Send Feedback | Thesis Templates
    Theme by 
    Atmire NV
     

     

    Browse

    All of etd@IIScCommunities & CollectionsTitlesAuthorsAdvisorsSubjectsBy Thesis Submission DateThis CollectionTitlesAuthorsAdvisorsSubjectsBy Thesis Submission Date

    My Account

    LoginRegister

    etd@IISc is a joint service of SERC & J R D Tata Memorial (JRDTML) Library || Powered by DSpace software || DuraSpace
    Contact Us | Send Feedback | Thesis Templates
    Theme by 
    Atmire NV