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    EVERYTHING YOU WANTED TO KNOW ABOUT DOUBLE DIFFERENTIAL ENCODERS BUT WERE AFRAID TO ASK

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    ITC_2006_06-09-02.pdf
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    Author
    Perrins, Erik
    Affiliation
    University of Kansas
    Issue Date
    2006-10
    
    Metadata
    Show full item record
    Rights
    Copyright © International Foundation for Telemetering
    Collection Information
    Proceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
    Publisher
    International Foundation for Telemetering
    Journal
    International Telemetering Conference Proceedings
    Abstract
    The existing offset quadrature phase shift keying (OQPSK) differential encoder in IRIG-106 is a curious scheme with a rather mysterious origin. In this paper, an alternative scheme known as double differential encoding is proposed. In many aspects, the proposed scheme has equivalent performance to the existing scheme: it successfully resolves the 4-phase ambiguity introduced by most carrier phase tracking loops and it also produces two decoded bit errors for each detection error. However, the proposed scheme has a number of conceptual advantages: it can be derived easily from first principles, it decouples the operations of even-bit/odd-bit demultiplexing and differential encoding, and it greatly simplifies the overly-complicated binary-to-ternary symbol mapping for OQPSK. It is also demonstrated to have tangible benefits, such as improved performance in systems with error control coding.
    Sponsors
    International Foundation for Telemetering
    ISSN
    0884-5123
    0074-9079
    Additional Links
    http://www.telemetry.org/
    Collections
    International Telemetering Conference Proceedings, Volume 42 (2006)

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