Synchronizer for MSK burst communications
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United States of America Patent
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-
Apr 6, 1982
Grant Date -
N/A
app pub date -
Aug 15, 1980
filing date -
Aug 15, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A synchronization preamble for each TDMA burst consists of an alternating sequence of the two MSK tones on every other MSK bit interval. Such a preamble does not exhibit random polarity reversals at the two MSK frequencies as occurs during the message burst. The receiving circuit therefore directly processes the preamble symbols to extract carrier phase and symbol synchronization without conventionally squaring the IF to remove polarity modulation. A 6 dB increase in synchronization SNR is thereby provided since the requisite synchronizer filtering need only be effected at the fundamental frequencies F.sub.L and F.sub.H rather than at the their second harmonics 2F.sub.L and 2F.sub.H as is required when squaring is employed.
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