Pulse or digital communications – Repeaters – Testing
Patent
1980-08-15
1982-04-06
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 47, 375106, 329112, H04L 2710
Patent
active
043240011
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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Chin Stephen
Communications Satellite Corporation
Safourek Benedict V.
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