Improved design for modulator and demodulator in offset-quaternary-phase-key-shifting (OQPSK) communication system enables receiver to resolve ambiguity in estimated phase of received signal. Features include unique-code-word modulation and detection and digital implementation of Costas loop in carrier-recovery subsystem. Enchances performance of carrier-recovery subsystem, reduces complexity of receiver by removing redundant circuits from previous design, and eliminates dependence of timing in receiver upon parallel-to-serial-conversion clock.


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    Title :

    Resolving Phase Ambiguities In OQPSK


    Contributors:

    Published in:

    Publication date :

    1991-07-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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