Pulse or digital communications – Synchronizers
Patent
1993-11-24
1996-12-17
Chin, Stephen
Pulse or digital communications
Synchronizers
375357, 375359, 375293, H04L 700, H04L 702, H04L 2549
Patent
active
055861504
ABSTRACT:
A block demodulation method and apparatus that provides for synchronizing bursts of incoming data without a special symbol synchronization word, and minimal frame synchronization overhead. An entire burst, comprising ramp up time, a preamble, guard times, data and ramp down time, is captured and stored in the form of baseband samples of the signal burst. The burst samples are then filtered to reduce pattern jitter. Thereafter, the samples are squared to derive the symbol clock. Then, the samples are differenced and cyclically accumulated. The cyclicly accumulated samples are examined to find a valid zero crossing. In the event that the aforementioned method does not identify a valid zero crossing, two additional methods for finding a valid zero crossing are employed.
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Balasubramaniam Rajupandaram K.
Chin Stephen
Phan Hai H.
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