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Reverse Modulation Carrier Recovery for Offset QPSK Burst Signals
Masahiro UMEHIRA Shuzo KATO
IEICE TRANSACTIONS on Communications
Publication Date: 1995/04/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Satellite Communication
satellite communication, offset QPSK, carrier recovery, reverse modulation, burst,
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This paper describes reverse modulation carrier recovery with a tank-limiter for Offset QPSK (OQPSK) burst signals. Acquisition performance is discussed taking into account hardware implementation errors in the carrier recovery circuit. The results indicate hardware implementation errors cause a significant recovered carrier phase error during BTR (Bit Timing Recovery) of OQPSK burst signals. A phase error reduction technique by modifying the BTR code for OQPSK burst signals is proposed to improve the acquisition performance. Computer simulation and hardware experiments confirmed its improvement. The performance of a prototype OQPSK burst demodulator using the proposed carrier recovery scheme is also presented.